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2s.io English Dictionary Lookup
x402
2s.io English Dictionary Lookup is a paid API for AI agents from 2s.io, paid per call via x402, $0.0012/call, status unknown (last checked 2026-09-15).
Looks up a single English word and returns full dictionary entries including IPA phonetics, audio pronunciation URLs, and meanings grouped by part of speech with definitions, examples, synonyms, and antonyms.
Price / call$0.0012
Success—
StatusUnknown
How this service works
English dictionary lookup via dictionaryapi.dev (Wiktionary-sourced). Returns full entries with IPA phonetic transcription(s), audio pronunciation URLs, and meanings grouped by part of speech. Each meaning carries definitions with usage examples and per-definition synonyms + antonyms. CC BY-SA 3.0/4.0 — attribute when redistributing. Useful for vocabulary agents, writing assistants, language-learning tools.
Output
Returns an array of dictionary entries for the word, each containing the word itself, phonetics (IPA text and audio URL), and an array of meanings organized by part of speech. Each meaning includes definitions with usage examples, plus per-definition synonyms and antonyms. Licensed CC BY-SA 3.0/4.0.
Example use cases
Example prompt
“Look up the word 'ephemeral' in the English dictionary and give me its IPA pronunciation, all its definitions by part of speech, and a few synonyms and antonyms.”
Technical details
Endpoint
GEThttps://2s.io/api/word/defineWhen to prefer
Use this endpoint when you need structured, Wiktionary-sourced English dictionary data including IPA phonetics, audio URLs, part-of-speech grouped meanings, usage examples, and synonym/antonym lists — especially for vocabulary agents, writing assistants, or language-learning tools. Prefer this over generic LLM-generated definitions when you need authoritative, citable, CC-licensed lexical data.
Side effects
- Word not found in Wiktionary — returns 404 or empty result
- Non-alphabetic or numeric input rejected — word must be 1-50 alphabetic characters
- Word too long (over 50 characters) — validation error
- Rare or highly technical words may have incomplete entries (missing audio, examples, or synonyms)
- Payment failure via x402 protocol — 402 response if USDC payment not processed
Input
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"word": "ephemeral"
}
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
{
"data": {
"ok": true,
"items": [
{
"word": "ephemeral",
"license": {
"url": "https://creativecommons.org/licenses/by-sa/3.0",
"name": "CC BY-SA 3.0"
},
"meanings": [
{
"antonyms": [],
"synonyms": [
"ephemeron"
],
"definitions": [
{
"example": null,
"antonyms": [],
"synonyms": [
"ephemeron"
],
"definition": "Something which lasts for a short period of time."
}
],
"partOfSpeech": "noun"
},
{
"antonyms": [
"eternal",
"everlasting",
"permanent",
"timeless"
],
"synonyms": [
"evanescent",
"fleeting",
"momentary",
"short",
"short-lived",
"temporary",
"transitory",
"volatile"
],
"definitions": [
{
"example": null,
"antonyms": [
"eternal",
"everlasting",
"permanent",
"timeless"
],
"synonyms": [
"evanescent",
"fleeting",
"momentary",
"short",
"short-lived",
"temporary",
"transitory",
"volatile"
],
"definition": "Lasting for a short period of time."
},
{
"example": null,
"antonyms": [],
"synonyms": [],
"definition": "Existing for only one day, as with some flowers, insects, and diseases."
},
{
"example": null,
"antonyms": [],
"synonyms": [],
"definition": "(of a body of water) Usually dry, but filling with water for brief periods during and after precipitation."
}
],
"partOfSpeech": "adjective"
}
],
"phonetic": "/əˈfɛ.mə.ɹəl/",
"phonetics": [
{
"text": "/əˈfɛ.mə.ɹəl/",
"audio": "https://api.dictionaryapi.dev/media/pronunciations/en/ephemeral-us.mp3",
"sourceUrl": "https://commons.wikimedia.org/w/index.php?curid=2526689"
}
],
"sourceUrls": [
"https://en.wiktionary.org/wiki/ephemeral"
]
}
],
"total": 1,
"source": {
"url": "https://dictionaryapi.dev/",
"license": "Free Dictionary API / Datamuse — open data",
"provider": "dictionaryapi.dev — free English dictionary API (Wiktionary-sourced)"
}
},
"meta": {
"cost": {
"usd": 0.0012,
"tier": 0
},
"caller": "x402",
"version": null,
"endpoint": "word.define",
"settlement": {
"txHash": "0xecebabc22463cfbc37ea91cfc77ae29490de2b6e9eb7fd3ec89ac725a63c024b",
"network": "eip155:8453",
"success": true
}
}
}Tags
x402
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