Text API - Translation, Correction & Processing

Professional text processing API: language detection, translation, grammar correction, summarization, and more.

API FAQ

Get API Key Buy Credits

What can you do?

Smart Translation

AI-powered translation to 50+ languages with context awareness.

Grammar & Spelling

Fix errors automatically while preserving meaning and tone.

Text Processing

Summarize, explain, rephrase — all in one unified API.

Endpoint:

99.9 % Uptime

— Response

5 req/s

0.001 Credits / request

Available Languages

Get a complete list of supported languages and variants.

POST https://api.yeb.to/v1/text/languages

Parameter	Type	Req.	Description
`api_key`	string	yes	Authentication key

Request Examples

{
  "api_key": "YOUR_KEY"
}

API Integrations

curl -X POST https://api.yeb.to/v1/text/languages \
  -H "Content-Type: application/json" \
  -H "X-API-Key: YOUR_KEY" \
  -d '{}'

$response = Http::withHeaders([
    'X-API-Key' => 'YOUR_KEY'
])->post('https://api.yeb.to/v1/text/languages');

$languages = $response->json()['languages'];

fetch('https://api.yeb.to/v1/text/languages', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'X-API-Key': 'YOUR_KEY'
  },
  body: JSON.stringify({})
})
.then(r => r.json())
.then(data => console.log(data.languages));

import requests

response = requests.post(
    'https://api.yeb.to/v1/text/languages',
    headers={'X-API-Key': 'YOUR_KEY'},
    json={}
)
languages = response.json()['languages']

Response Example

{
  "languages": [
    {
      "id": 21,
      "name": "English",
      "code": "en",
      "variants": [
        {
          "id": 1,
          "name": "American English",
          "tone": "regional"
        },
        {
          "id": 2,
          "name": "British English",
          "tone": "regional"
        }
      ]
    },
    {
      "id": 11,
      "name": "Bulgarian",
      "code": "bg",
      "variants": []
    },
    {
      "id": 87,
      "name": "Spanish",
      "code": "es",
      "variants": [
        {
          "id": 5,
          "name": "Castilian Spanish",
          "tone": "regional"
        },
        {
          "id": 6,
          "name": "Latin American Spanish",
          "tone": "regional"
        }
      ]
    }
  ],
  "response_code": 200,
  "response_time_ms": 8
}

Response Codes

Code	Description
200 Success	Request processed OK.
400 Bad Request	Input validation failed.
401 Unauthorized	Missing / wrong API key.
403 Forbidden	Key inactive or not allowed.
429 Rate Limit	Too many requests.
500 Server Error	Unexpected failure.

List Languages

text-languages 0.0010 credits

Method

URL

Authentication

API Key

Parameters

API Key

body · string · required

Code Samples

Response

Status: —

Headers

Body

Language Detection

Automatically identify languages in text with confidence scores.

POST https://api.yeb.to/v1/text/detect-language

Parameter	Type	Req.	Description
`api_key`	string	yes	Authentication key
`text`	string	yes	Text to analyze for language detection

Request Examples

{
  "api_key": "YOUR_KEY",
  "text": "Hello world! Bonjour le monde!"
}

API Integrations

curl -X POST https://api.yeb.to/v1/text/detect-language \
  -H "Content-Type: application/json" \
  -H "X-API-Key: YOUR_KEY" \
  -d '{"text": "Hello world! Bonjour!"}'

$response = Http::withHeaders([
    'X-API-Key' => 'YOUR_KEY'
])->post('https://api.yeb.to/v1/text/detect-language', [
    'text' => 'Hello world! Bonjour!'
]);

$detections = $response->json()['detections'];

fetch('https://api.yeb.to/v1/text/detect-language', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'X-API-Key': 'YOUR_KEY'
  },
  body: JSON.stringify({
    text: 'Hello world! Bonjour!'
  })
})
.then(r => r.json())
.then(data => console.log(data.detections));

import requests

response = requests.post(
    'https://api.yeb.to/v1/text/detect-language',
    headers={'X-API-Key': 'YOUR_KEY'},
    json={'text': 'Hello world! Bonjour!'}
)
detections = response.json()['detections']

Response Example

{
  "detections": [
    {
      "code": "en",
      "confidence": 0.95
    },
    {
      "code": "fr",
      "confidence": 0.92
    }
  ],
  "languages": [
    {
      "id": 21,
      "name": "English",
      "code": "en"
    },
    {
      "id": 26,
      "name": "French",
      "code": "fr"
    }
  ],
  "response_code": 200,
  "response_time_ms": 523
}

{
  "error": "text is required",
  "code": 422,
  "response_code": 422,
  "response_time_ms": 8
}

Response Codes

Code	Description
200 Success	Request processed OK.
400 Bad Request	Input validation failed.
401 Unauthorized	Missing / wrong API key.
403 Forbidden	Key inactive or not allowed.
429 Rate Limit	Too many requests.
500 Server Error	Unexpected failure.

Detect Language

text-detect-language 0.0090 credits

Method

URL

Authentication

API Key

Parameters

API Key

body · string · required

Text

body · string · required

Code Samples

Response

Status: —

Headers

Body

Translate Text

Professional translation with context and variant support.

POST https://api.yeb.to/v1/text/translate

Parameter	Type	Req.	Description
`api_key`	string	yes	Authentication key
`text`	string	yes	Text to translate
`target_language`	object	yes	Target language: `{"type":"language\|variant", "id":123}` Example: `{"type":"language","id":26}` for French Or: `{"type":"variant","id":1}` for American English
`source_languages`	array	opt	Array of source language objects for mixed/ambiguous text Format: `[{"type":"language","id":76}, {"type":"language","id":11}]` Helps with: Multilingual text, cognates, technical terms Example: Russian (76) + Bulgarian (11) mixed text
`context`	string	opt	Context text (max 100 chars): tone, voice, perspective Example: "Medical doctor, formal" or "Feminine, casual"

Request Examples

Example 1: Basic translation to language

{
  "api_key": "YOUR_KEY",
  "text": "Hello, how are you?",
  "target_language": {
    "type": "language",
    "id": 26
  }
}

Example 2: Translation to variant with context

{
  "api_key": "YOUR_KEY",
  "text": "The patient has a fever",
  "target_language": {
    "type": "variant",
    "id": 7
  },
  "context": "Medical doctor, formal terminology"
}

Example 3: Multilingual text with source_languages

{
  "api_key": "YOUR_KEY",
  "text": "Привет! Как си? Я хочу кафе.",
  "target_language": {
    "type": "language",
    "id": 21
  },
  "source_languages": [
    {"type": "language", "id": 76},
    {"type": "language", "id": 11}
  ]
}

Example 4: All parameters combined

{
  "api_key": "YOUR_KEY",
  "text": "Hello! Je voudrais annuler mon compte.",
  "target_language": {
    "type": "variant",
    "id": 1
  },
  "source_languages": [
    {"type": "language", "id": 21},
    {"type": "language", "id": 26}
  ],
  "context": "Customer support, polite and professional"
}

API Integrations

curl -X POST https://api.yeb.to/v1/text/translate \
  -H "Content-Type: application/json" \
  -H "X-API-Key: YOUR_KEY" \
  -d '{
    "text": "Привет! Как си?",
    "target_language": {"type":"language","id":21},
    "source_languages": [
      {"type":"language","id":76},
      {"type":"language","id":11}
    ]
  }'

$response = Http::withHeaders([
    'X-API-Key' => 'YOUR_KEY'
])->post('https://api.yeb.to/v1/text/translate', [
    'text' => 'Hello! Je voudrais aide.',
    'target_language' => [
        'type' => 'language',
        'id' => 21
    ],
    'source_languages' => [
        ['type' => 'language', 'id' => 21],
        ['type' => 'language', 'id' => 26]
    ],
    'context' => 'Customer support, polite'
]);

$translated = $response->json()['translated_text'];

fetch('https://api.yeb.to/v1/text/translate', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'X-API-Key': 'YOUR_KEY'
  },
  body: JSON.stringify({
    text: 'Привет! Как си?',
    target_language: {type:'language',id:21},
    source_languages: [
      {type:'language',id:76},
      {type:'language',id:11}
    ],
    context: 'Casual conversation'
  })
})
.then(r => r.json())
.then(data => console.log(data.translated_text));

import requests

response = requests.post(
    'https://api.yeb.to/v1/text/translate',
    headers={'X-API-Key': 'YOUR_KEY'},
    json={
        'text': 'Hello! Bonjour!',
        'target_language': {'type':'language','id':11},
        'source_languages': [
            {'type':'language','id':21},
            {'type':'language','id':26}
        ],
        'context': 'Formal business'
    }
)
translated = response.json()['translated_text']

Response Example

{
  "translated_text": "Bonjour, comment allez-vous?",
  "target_language": {
    "type": "language",
    "id": 26,
    "code": "fr",
    "name": "French",
    "label": "French"
  },
  "response_code": 200,
  "response_time_ms": 842
}

{
  "error": "target_language is required",
  "code": 422,
  "response_code": 422,
  "response_time_ms": 8
}

Response Codes

Code	Description
200 Success	Request processed OK.
400 Bad Request	Input validation failed.
401 Unauthorized	Missing / wrong API key.
403 Forbidden	Key inactive or not allowed.
429 Rate Limit	Too many requests.
500 Server Error	Unexpected failure.

Language ID Reference

Popular Languages:

21 - English (4 variants)
11 - Bulgarian
26 - French (2 variants)
87 - Spanish (2 variants)
30 - German (3 variants)
76 - Russian
73 - Portuguese (2 variants)

Example Variants:

1 - American English
2 - British English
5 - Castilian Spanish
6 - Latin American Spanish
7 - Brazilian Portuguese
8 - European Portuguese

Get all 105 languages: POST /v1/text/languages

Translate Text

text-translate 0.0200 credits

Method

URL

Authentication

API Key

Parameters

API Key

body · string · required

Text

body · string · required

Target Language

body · string · required

Source Languages

body · string

Context

body · string

Code Samples

Response

Status: —

Headers

Body

Rephrase Text

Rewrite text to be clearer and more natural.

POST https://api.yeb.to/v1/text/rephrase

Parameter	Type	Req.	Description
`api_key`	string	yes	Authentication key
`text`	string	yes	Text to rephrase
`context`	string	opt	Context text (max 100 chars): tone, voice, style Example: "Formal business" or "Casual friendly"

Request Examples

Example 1: Basic rephrase

{
  "api_key": "YOUR_KEY",
  "text": "The thing that I want to say is that this is really good."
}

Example 2: Rephrase with context

{
  "api_key": "YOUR_KEY",
  "text": "I wanna tell you that this stuff is awesome.",
  "context": "Formal business communication"
}

API Integrations

curl -X POST https://api.yeb.to/v1/text/rephrase \
  -H "Content-Type: application/json" \
  -H "X-API-Key: YOUR_KEY" \
  -d '{
    "text": "I wanna say this is awesome.",
    "context": "Professional tone"
  }'

$response = Http::withHeaders([
    'X-API-Key' => 'YOUR_KEY'
])->post('https://api.yeb.to/v1/text/rephrase', [
    'text' => 'I wanna say this is awesome.',
    'context' => 'Professional tone'
]);

$rephrased = $response->json()['rephrased_text'];

fetch('https://api.yeb.to/v1/text/rephrase', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'X-API-Key': 'YOUR_KEY'
  },
  body: JSON.stringify({
    text: 'I wanna say this is awesome.',
    context: 'Professional tone'
  })
})
.then(r => r.json())
.then(data => console.log(data.rephrased_text));

import requests

response = requests.post(
    'https://api.yeb.to/v1/text/rephrase',
    headers={'X-API-Key': 'YOUR_KEY'},
    json={
        'text': 'I wanna say this is awesome.',
        'context': 'Professional tone'
    }
)
rephrased = response.json()['rephrased_text']

Response Example

{
  "rephrased_text": "I would like to express that this is excellent.",
  "response_code": 200,
  "response_time_ms": 756
}

{
  "error": "text is required",
  "code": 422,
  "response_code": 422,
  "response_time_ms": 8
}

Response Codes

Code	Description
200 Success	Request processed OK.
400 Bad Request	Input validation failed.
401 Unauthorized	Missing / wrong API key.
403 Forbidden	Key inactive or not allowed.
429 Rate Limit	Too many requests.
500 Server Error	Unexpected failure.

Context Examples

"Formal business" - Professional tone
"Casual friendly" - Relaxed conversational
"Technical documentation" - Clear, precise
"Marketing copy" - Engaging, persuasive
"Academic writing" - Scholarly tone

Rephrase Text

text-rephrase 0.0200 credits

Method

URL

Authentication

API Key

Parameters

API Key

body · string · required

Text

body · string · required

Context

body · string

Code Samples

Response

Status: —

Headers

Body

Grammar Correction

Fix spelling, grammar, and punctuation errors.

POST https://api.yeb.to/v1/text/correct

Parameter	Type	Req.	Description
`api_key`	string	yes	Authentication key
`text`	string	yes	Text to correct (grammar, spelling, punctuation)
`context`	string	opt	Context text (max 100 chars): preserve voice/style Example: "Technical writing" or "Casual tone"

Request Examples

Example 1: Basic correction

{
  "api_key": "YOUR_KEY",
  "text": "Their going too the store tommorow."
}

Example 2: Correction with context

{
  "api_key": "YOUR_KEY",
  "text": "The pacient has a feever and headake.",
  "context": "Medical documentation"
}

API Integrations

curl -X POST https://api.yeb.to/v1/text/correct \
  -H "Content-Type: application/json" \
  -H "X-API-Key: YOUR_KEY" \
  -d '{
    "text": "Their going too the store.",
    "context": "Casual conversation"
  }'

$response = Http::withHeaders([
    'X-API-Key' => 'YOUR_KEY'
])->post('https://api.yeb.to/v1/text/correct', [
    'text' => 'Their going too the store.',
    'context' => 'Casual conversation'
]);

$corrected = $response->json()['corrected_text'];

fetch('https://api.yeb.to/v1/text/correct', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'X-API-Key': 'YOUR_KEY'
  },
  body: JSON.stringify({
    text: 'Their going too the store.',
    context: 'Casual conversation'
  })
})
.then(r => r.json())
.then(data => console.log(data.corrected_text));

import requests

response = requests.post(
    'https://api.yeb.to/v1/text/correct',
    headers={'X-API-Key': 'YOUR_KEY'},
    json={
        'text': 'Their going too the store.',
        'context': 'Casual conversation'
    }
)
corrected = response.json()['corrected_text']

Response Example

{
  "corrected_text": "They're going to the store tomorrow.",
  "response_code": 200,
  "response_time_ms": 634
}

{
  "error": "text is required",
  "code": 422,
  "response_code": 422,
  "response_time_ms": 8
}

Response Codes

Code	Description
200 Success	Request processed OK.
400 Bad Request	Input validation failed.
401 Unauthorized	Missing / wrong API key.
403 Forbidden	Key inactive or not allowed.
429 Rate Limit	Too many requests.
500 Server Error	Unexpected failure.

What Gets Corrected

Grammar errors
Spelling mistakes
Punctuation issues
Word confusion (their/they're)
Preserves original meaning

Correct Text

text-correct 0.0200 credits

Method

URL

Authentication

API Key

Parameters

API Key

body · string · required

Text

body · string · required

Context

body · string

Code Samples

Response

Status: —

Headers

Body

Summarize Text

Create concise summaries of long content.

POST https://api.yeb.to/v1/text/summarize

Parameter	Type	Req.	Description
`api_key`	string	yes	Authentication key
`text`	string	yes	Text to summarize
`max_sentences`	integer	opt	Maximum sentences in summary (default: 5, range: 1-20)
`target_language`	object	opt	Output language for the summary. Object: `{"type":"language","id":26}` If omitted, summary keeps the same language as input
`source_languages`	array	opt	Source language hints: `[{"type":"language","id":21}]`
`context`	string	opt	Context text (max 500 chars): summary style/focus Example: "Focus on key points" or "Executive summary"

Request Examples

Example 1: Basic summarization

{
  "api_key": "YOUR_KEY",
  "text": "Long article text here...",
  "max_sentences": 3
}

Example 2: Summarization with context

{
  "api_key": "YOUR_KEY",
  "text": "The quarterly report shows significant growth in all sectors...",
  "max_sentences": 5,
  "context": "Executive summary, highlight financial metrics"
}

Example 3: Summarize in a different language

{
  "api_key": "YOUR_KEY",
  "text": "Long article in English about climate change...",
  "max_sentences": 3,
  "target_language": {"type": "language", "id": 26}
}

API Integrations

curl -X POST https://api.yeb.to/v1/text/summarize \
  -H "Content-Type: application/json" \
  -H "X-API-Key: YOUR_KEY" \
  -d '{
    "text": "Long article text here...",
    "max_sentences": 3,
    "context": "Focus on key points"
  }'

$response = Http::withHeaders([
    'X-API-Key' => 'YOUR_KEY'
])->post('https://api.yeb.to/v1/text/summarize', [
    'text' => 'Long article text here...',
    'max_sentences' => 3,
    'context' => 'Focus on key points'
]);

$summary = $response->json()['summary_text'];

fetch('https://api.yeb.to/v1/text/summarize', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'X-API-Key': 'YOUR_KEY'
  },
  body: JSON.stringify({
    text: 'Long article text here...',
    max_sentences: 3,
    context: 'Focus on key points'
  })
})
.then(r => r.json())
.then(data => console.log(data.summary_text));

import requests

response = requests.post(
    'https://api.yeb.to/v1/text/summarize',
    headers={'X-API-Key': 'YOUR_KEY'},
    json={
        'text': 'Long article text here...',
        'max_sentences': 3,
        'context': 'Focus on key points'
    }
)
summary = response.json()['summary_text']

Response Example

{
  "summary_text": "The article discusses three main points. First, it covers historical context. Finally, it provides modern applications.",
  "response_code": 200,
  "response_time_ms": 891
}

{
  "error": "text is required",
  "code": 422,
  "response_code": 422,
  "response_time_ms": 8
}

Response Codes

Code	Description
200 Success	Request processed OK.
400 Bad Request	Input validation failed.
401 Unauthorized	Missing / wrong API key.
403 Forbidden	Key inactive or not allowed.
429 Rate Limit	Too many requests.
500 Server Error	Unexpected failure.

Summary Length Guide

1-2 sentences - Quick headline
3-5 sentences - Brief overview (default)
6-10 sentences - Detailed summary
10-20 sentences - Comprehensive digest

Context Examples

"Executive summary"
"Focus on technical details"
"Highlight action items"
"For non-technical audience"

Summarize Text

text-summarize 0.0200 credits

Method

URL

Authentication

API Key

Parameters

API Key

body · string · required

Text

body · string · required

Max Sentences

body · string

Target Language

body · string

Source Languages

body · string

Context

body · string

Code Samples

Response

Status: —

Headers

Body

Explain Text

Explain complex text in simple, easy-to-understand terms.

POST https://api.yeb.to/v1/text/explain

Parameter	Type	Req.	Description
`api_key`	string	yes	Authentication key
`text`	string	yes	Text to explain in simple terms
`explanation_language`	string	opt	Language for explanation: `en\|de\|es\|fr\|tr\|bg` Default: `bg` (Bulgarian)
`context`	string	opt	Context text (max 100 chars): audience level Example: "For a 10-year-old" or "Academic audience"

Request Examples

Example 1: Basic explanation in English

{
  "api_key": "YOUR_KEY",
  "text": "Quantum entanglement is a physical phenomenon that occurs when particles become interconnected.",
  "explanation_language": "en"
}

Example 2: Explanation with context

{
  "api_key": "YOUR_KEY",
  "text": "The mitochondria is the powerhouse of the cell.",
  "explanation_language": "en",
  "context": "Explain for a 10-year-old"
}

API Integrations

curl -X POST https://api.yeb.to/v1/text/explain \
  -H "Content-Type: application/json" \
  -H "X-API-Key: YOUR_KEY" \
  -d '{
    "text": "Quantum entanglement is...",
    "explanation_language": "en",
    "context": "For a child"
  }'

$response = Http::withHeaders([
    'X-API-Key' => 'YOUR_KEY'
])->post('https://api.yeb.to/v1/text/explain', [
    'text' => 'Quantum entanglement is...',
    'explanation_language' => 'en',
    'context' => 'For a child'
]);

$explanation = $response->json()['explanation_text'];

fetch('https://api.yeb.to/v1/text/explain', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'X-API-Key': 'YOUR_KEY'
  },
  body: JSON.stringify({
    text: 'Quantum entanglement is...',
    explanation_language: 'en',
    context: 'For a child'
  })
})
.then(r => r.json())
.then(data => console.log(data.explanation_text));

import requests

response = requests.post(
    'https://api.yeb.to/v1/text/explain',
    headers={'X-API-Key': 'YOUR_KEY'},
    json={
        'text': 'Quantum entanglement is...',
        'explanation_language': 'en',
        'context': 'For a child'
    }
)
explanation = response.json()['explanation_text']

Response Example

{
  "explanation_text": "Quantum entanglement is like magic twins - when something happens to one, the other feels it instantly, no matter how far apart they are.",
  "response_code": 200,
  "response_time_ms": 1023
}

{
  "error": "text is required",
  "code": 422,
  "response_code": 422,
  "response_time_ms": 8
}

Response Codes

Code	Description
200 Success	Request processed OK.
400 Bad Request	Input validation failed.
401 Unauthorized	Missing / wrong API key.
403 Forbidden	Key inactive or not allowed.
429 Rate Limit	Too many requests.
500 Server Error	Unexpected failure.

Explanation Languages

bg - Bulgarian (default)
en - English
de - German
es - Spanish
fr - French
tr - Turkish

Context Examples

"For a 10-year-old"
"Academic audience"
"Non-technical reader"
"Medical professional"

text/explain

text/explain 0.0200 credits

Method

URL

Authentication

API Key

Parameters

No parameters for this endpoint.

Code Samples

Response

Status: —

Headers

Body

Find Synonyms

Find context-aware synonyms for a selected word or phrase within your text. Returns up to 5 synonyms ranked by accuracy.

POST https://api.yeb.to/v1/text/synonyms

Parameter	Type	Req.	Description
`api_key`	string	yes	Authentication key
`selected_text`	string	yes	Word or phrase to find synonyms for (max 50 characters)
`source_text`	string	yes	Full text providing context for synonym selection (max 50,000 chars)
`source_languages`	array	opt	Array of source language descriptors: `[{"type":"language","id":1}]`
`context`	string	opt	Context/preference for synonym selection (max 500 chars) Example: "Formal tone, masculine"

Request Examples

Example 1: Basic synonyms

{
  "api_key": "YOUR_KEY",
  "selected_text": "happy",
  "source_text": "I am very happy to see you today."
}

Example 2: Synonyms with context and language

{
  "api_key": "YOUR_KEY",
  "selected_text": "happy",
  "source_text": "I am very happy to see you today.",
  "source_languages": [{"type": "language", "id": 1}],
  "context": "Formal business communication"
}

API Integrations

curl -X POST https://api.yeb.to/v1/text/synonyms \
  -H "Content-Type: application/json" \
  -d '{
    "api_key": "YOUR_KEY",
    "selected_text": "happy",
    "source_text": "I am very happy to see you today.",
    "source_languages": [{"type": "language", "id": 1}]
  }'

$response = Http::post('https://api.yeb.to/v1/text/synonyms', [
    'api_key' => 'YOUR_KEY',
    'selected_text' => 'happy',
    'source_text' => 'I am very happy to see you today.',
    'source_languages' => [['type' => 'language', 'id' => 1]],
]);

$synonyms = $response->json()['synonyms'];

const response = await fetch('https://api.yeb.to/v1/text/synonyms', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    api_key: 'YOUR_KEY',
    selected_text: 'happy',
    source_text: 'I am very happy to see you today.',
    source_languages: [{ type: 'language', id: 1 }]
  })
});
const { synonyms } = await response.json();
console.log(synonyms);

import requests

response = requests.post(
    'https://api.yeb.to/v1/text/synonyms',
    json={
        'api_key': 'YOUR_KEY',
        'selected_text': 'happy',
        'source_text': 'I am very happy to see you today.',
        'source_languages': [{'type': 'language', 'id': 1}]
    }
)
synonyms = response.json()['synonyms']

Response Example

{
  "synonyms": [
    { "word": "joyful", "accuracy": 95 },
    { "word": "cheerful", "accuracy": 90 },
    { "word": "delighted", "accuracy": 85 },
    { "word": "pleased", "accuracy": 80 },
    { "word": "content", "accuracy": 75 }
  ],
  "response_code": 200,
  "response_time_ms": 892
}

{
  "error": "selected_text is required and must be at most 50 characters",
  "code": 422,
  "response_code": 422,
  "response_time_ms": 5
}

Response Codes

Code	Description
200 Success	Request processed OK.
400 Bad Request	Input validation failed.
401 Unauthorized	Missing / wrong API key.
403 Forbidden	Key inactive or not allowed.
429 Rate Limit	Too many requests.
500 Server Error	Unexpected failure.

Context Examples

"Formal business" - Professional synonyms
"Casual friendly" - Informal alternatives
"Medical terminology" - Domain-specific
"Masculine, formal" - Gendered + formal
"Poetic, literary" - Creative alternatives

How It Works

Send the selected word/phrase and the full text
AI analyzes the word in its context
Returns top 5 synonyms ranked by accuracy
Each synonym includes an accuracy % (0-100)

Find Synonyms

text-synonyms 0.0200 credits

Method

URL

Authentication

API Key

Parameters

API Key

body · string · required

Selected Text

body · string · required

Source Text

body · string · required

Source Languages

body · string

Context

body · string

Code Samples

Response

Status: —

Headers

Body

Text API - Translation, Correction & Processing — Practical Guide

A comprehensive guide to the Text API: language detection, professional translation, grammar correction, text summarization, explanation, and rephrasing. Learn which endpoint to use when, how parameters work in practice, and how to build AI-powered text processing into your apps.

Last updated: 21 Feb 2026, 01:06 API Version: v1 Burst: 5 req/s Zero Database Dependencies

#What Text API solves

The Text API provides 8 specialized endpoints for professional text processing: detect languages automatically, translate with context awareness, fix grammar and spelling, rephrase for clarity, summarize long content, explain complex text in simple terms, and find context-aware synonyms. Perfect for multilingual apps, content platforms, customer support, and educational tools. All powered by config-based languages with zero database dependencies.

#Available endpoints

#`POST /v1/text/languages`

Best for: Getting the complete list of 105 supported languages and their variants
Source: Static config file (fast, no database)
Use case: Populate language dropdowns, validate language IDs before translation

#`POST /v1/text/detect-language`

Best for: Automatically identifying the language(s) in user-submitted text
Returns: Language codes with confidence scores (0-1)
Use case: Auto-routing support tickets, content moderation, multilingual search indexing

#`POST /v1/text/translate`

Best for: Professional translation with context preservation
Supports: 105 languages, 23 regional variants (American English, Brazilian Portuguese, etc.)
Context: Simple text parameter (max 500 chars) for tone/style preferences
Use case: E-commerce localization, multilingual customer communication, content publishing

#`POST /v1/text/rephrase`

Best for: Rewriting text to be clearer, more natural, or more concise
Keeps: Same language, same meaning, improved readability
Context support: Apply custom voice/tone (masculine, feminine, formal, casual)
Use case: Content optimization, email polish, documentation improvement

#`POST /v1/text/correct`

Best for: Fixing grammar, spelling, and punctuation errors
Preserves: Original meaning and voice, corrects only mistakes
Context support: Maintain specific style/voice during correction
Use case: User-generated content cleanup, automated proofreading, form validation

#`POST /v1/text/summarize`

Best for: Creating concise summaries of long documents or articles
Control: Set max_sentences (default: 5) for summary length
Output language: Optional target_language to get summary in a different language
Context support: Summary style/audience preferences
Use case: News digests, document previews, meeting notes, research abstracts

#`POST /v1/text/explain`

Best for: Explaining complex text in simple, easy-to-understand terms
Languages: Explain in any of the 105 supported languages (default: BG)
Context support: Audience level (for children, academic, etc.)
Use case: Educational platforms, customer FAQs, technical documentation simplified

#`POST /v1/text/synonyms`

Best for: Finding context-aware synonyms for a selected word or phrase
Returns: Up to 5 synonyms ranked by accuracy (0-100%)
Context support: Tone, style, and domain preferences for synonym selection
Use case: Writing assistants, vocabulary builders, content optimization, text editors with word suggestions

#Quick start

# Get all 105 languages
curl -X POST "https://api.yeb.to/v1/text/languages" \
  -H "X-API-Key: YOUR_KEY"

# Translate to French (language ID 26)
curl -X POST "https://api.yeb.to/v1/text/translate" \
  -H "X-API-Key: YOUR_KEY" \
  -d '{
    "text": "Hello, how are you?",
    "target_language": {"type":"language","id":26}
  }'

# Translate with context
curl -X POST "https://api.yeb.to/v1/text/translate" \
  -H "X-API-Key: YOUR_KEY" \
  -d '{
    "text": "The patient has a fever",
    "target_language": {"type":"language","id":26},
    "context": "Medical doctor, formal terminology"
  }'

#Key parameters explained

Param	Used in	What to pass	Why it matters
`api_key`	All	Via header (`X-API-Key`) or body param	Authentication & rate limiting
`text`	All except languages	Text to process (string)	Primary content for operation
`target_language`	translate, summarize	`{"type":"language\|variant","id":123}`	Specifies output language. Required for translate, optional for summarize (defaults to same language as input)
`source_languages`	translate, summarize	Array: `[{"type":"language","id":76}]`	Hint for multilingual/ambiguous source text
`context`	All text operations	Simple text (max 500 chars)	Apply custom preferences (tone, voice, style, audience)
`max_sentences`	summarize	Integer (default: 5)	Control summary length
`explanation_language`	explain	Any supported language code (default: bg)	Language for simplified explanation
`selected_text`	synonyms	Word or phrase (max 50 chars)	The word/phrase to find synonyms for
`source_text`	synonyms	Full surrounding text (max 50,000 chars)	Provides context for accurate synonym ranking

#Understanding Languages & Variants

The API supports 105 languages with 23 regional/tonal variants:

Language ID 21 (English) → Variants: American (ID 1), British (ID 2), Australian (ID 3), Canadian (ID 4)
Language ID 87 (Spanish) → Variants: Castilian (ID 5), Latin American (ID 6)
Language ID 73 (Portuguese) → Variants: Brazilian (ID 7), European (ID 8)
Language ID 26 (French) → Variants: Metropolitan (ID 9), Canadian (ID 10)
Language ID 30 (German) → Variants: Standard (ID 11), Swiss (ID 12), Austrian (ID 13)

Fetch the complete list with /v1/text/languages. All language/variant IDs are documented and stable.

#Using context parameter

The context parameter accepts simple text (max 500 chars) to guide the AI:

Voice/Gender: "Masculine", "Feminine", "Neutral gender"
Tone: "Formal business", "Casual friendly", "Technical documentation"
Perspective: "Doctor's point of view", "Patient-friendly language"
Industry: "Legal terminology", "Medical context", "Software development"
Audience: "For children under 10", "Academic audience", "B2B executives"

{
  "text": "The patient presents with fever",
  "target_language": {"type":"language","id":26},
  "context": "Medical doctor, formal terminology"
}

#Reading & handling responses

#Success responses

// Translation to language
{
  "translated_text": "Bonjour, comment allez-vous?",
  "target_language": {
    "type": "language",
    "id": 26,
    "code": "fr",
    "name": "French",
    "label": "French"
  },
  "response_code": 200,
  "response_time_ms": 842
}

// Translation to variant (British English)
{
  "translated_text": "Good morning, how are you today?",
  "target_language": {
    "type": "variant",
    "id": 2,
    "code": "en",
    "name": "English",
    "label": "English – British English",
    "tone": "regional",
    "variant_id": 2
  },
  "response_code": 200,
  "response_time_ms": 765
}

// Language detection
{
  "detections": [
    {"code": "en", "confidence": 0.95},
    {"code": "fr", "confidence": 0.92}
  ],
  "languages": [
    {"id": 21, "name": "English", "code": "en"},
    {"id": 26, "name": "French", "code": "fr"}
  ],
  "response_code": 200,
  "response_time_ms": 523
}

// Synonyms
{
  "synonyms": [
    {"word": "joyful", "accuracy": 95},
    {"word": "cheerful", "accuracy": 90},
    {"word": "delighted", "accuracy": 85},
    {"word": "pleased", "accuracy": 80},
    {"word": "content", "accuracy": 75}
  ],
  "response_code": 200,
  "response_time_ms": 892
}

#Error responses

{ "error": "text is required", "code": 422, "response_code": 422 }

{ "error": "Invalid API key", "code": 401, "response_code": 401 }

401: Invalid or missing API key
422: Missing required parameters or invalid format
429: Rate limit exceeded (10 req/s)
402: Insufficient credits
500: Server error (retry with exponential backoff)

#Real-world use cases

#E-commerce localization

Challenge: Translate product descriptions to 10+ languages
Solution: Use translate with variants for regional preferences

// Translate to Brazilian Portuguese (variant ID 7)
POST /v1/text/translate
{
  "text": "Premium leather wallet with RFID protection",
  "target_language": {"type":"variant","id":7},
  "context": "E-commerce product, professional tone"
}

#Customer support automation

Challenge: Handle multilingual support tickets
Solution: detect-language → translate with source_languages

// 1. Detect languages in ticket
POST /v1/text/detect-language {"text":"Hello! Je voudrais aide..."}
// Returns: languages [21, 26]

// 2. Translate with source hint
POST /v1/text/translate {
  "text":"Hello! Je voudrais aide avec mon compte.",
  "target_language":{"type":"language","id":21},
  "source_languages":[
    {"type":"language","id":21},
    {"type":"language","id":26}
  ],
  "context":"Customer support, polite"
}

// 3. Summarize for quick triage
POST /v1/text/summarize {
  "text":"...",
  "max_sentences":2,
  "context":"Support ticket summary, highlight urgency"
}

#Content platform with voice preferences

Challenge: User-generated content needs correction while maintaining voice
Solution: Use context to preserve gender/tone

// Correct while maintaining feminine voice
POST /v1/text/correct {
  "text":"Their going too the store",
  "context":"Feminine voice, casual tone"
}
// → "She's going to the store"

// Rephrase with masculine, formal context
POST /v1/text/rephrase {
  "text":"I wanna say that...",
  "context":"Masculine, formal business communication"
}
// → "I would like to state that..."

#Best practices

Cache language lists: /languages returns config data — cache for 24h or longer
Use language IDs consistently: Document which IDs your app uses (e.g., English=21, Spanish=87)
Leverage variants: Use American English (ID 1) vs British (ID 2) for regional accuracy
Keep contexts concise: 500 char limit — focus on key preferences like "Formal medical" not lengthy descriptions
Combine operations: detect → translate → correct for multilingual content pipelines
Handle rate limits: Implement exponential backoff for 429 responses
Monitor response times: Use response_time_ms to track API performance

#Technical architecture

Text API uses a config-based architecture with zero database dependencies:

Languages: Static config file with 105 languages + 23 variants
Contexts: Simple text parameters (no database storage)
Logging: Handled by ApiBase (existing api_requests tables)
Performance: ~5-10ms for /languages, no database queries for language lookups

#API Changelog

2026-02-18

v1.1: New synonyms endpoint — find context-aware synonyms with accuracy scores. Expanded explain to support all 105 languages (was 6). Context parameter limit increased from 100 to 500 characters.

2025-01-09

v1.0 Launch: Complete rebranding from Popnie API to Text API. New RESTful structure with dedicated endpoints. Config-based languages (105 languages, 23 variants). Simple context system. Zero database dependencies for languages and contexts. Improved language variant system with regional/tonal support.

Frequently Asked Questions

We support 50+ languages for translation, with language detection working for all major world languages including Cyrillic, Latin, Asian, and Middle Eastern scripts.

Our AI-powered translation maintains context and nuance, achieving professional-grade quality. For critical documents, we recommend human review.

Contexts let you define preferences like tone (formal/casual), industry terminology, and style guides that apply to all your text processing requests.

Yes! We preserve paragraphs, line breaks, and list structures. Complex formatting like tables may require special handling.

Yes. Every request, even those resulting in errors, consumes credits. This is because your credits are tied to the number of requests, regardless of success or failure. If the error is clearly due to a platform problem on our end, we will restore the affected credits (no cash refunds).

Contact us at [email protected]. We take feedback seriously—if your bug report or feature request is meaningful, we can fix or improve the API quickly and grant you 50 free credits as a thank you.

It depends on the API and sometimes even on the endpoint. Some endpoints use data from external sources, which may have stricter limits. We also enforce limits to prevent abuse and keep our platform stable. Check the docs for the specific rate limit for each endpoint.

We operate on a credit system. Credits are prepaid, non-refundable units you spend on API calls and tools. Credits are consumed FIFO (oldest first) and are valid for 12 months from the purchase date. The dashboard shows each purchase date and its expiry.

Yes. All purchased credits (including fractional balances) are valid for 12 months from purchase. Unused credits automatically expire and are permanently deleted at the end of the validity period. Expired credits cannot be restored or converted to cash or other value. Transitional rule: credits bought before 22 Sep 2025 are treated as purchased on 22 Sep 2025 and expire on 22 Sep 2026 (unless an earlier expiry was stated at purchase).

Yes—within their validity window. Unused credits remain available and roll over month-to-month until they expire 12 months after purchase.

Credits are non-refundable. Only buy what you need—you can always top up later. If a platform-side error causes a failed charge, we may restore the affected credits after investigation. No cash refunds.

Prices are set in credits, not dollars. Each endpoint lists its own cost—see the “Credits / request” badge above. You’ll always know exactly what you’re spending.

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