# 2s.io English Dictionary Lookup

> 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.

## Facts

- Endpoint: GET https://2s.io/api/word/define
- Price: $0.0012/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/2s-io-e1b4b3f0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7QEfLC1A1oCI3UEM3JcTW

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability 2s-io-e1b4b3f0
```

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.

## When to prefer this

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.

## Known failure modes

- 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

## 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 request

```json
{
 "input": {
  "type": "http",
  "method": "GET",
  "queryParams": {
   "word": "ephemeral"
  }
 }
}
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "queryParams"
   ],
   "properties": {
    "type": {
     "const": "http"
    },
    "method": {
     "const": "GET"
    },
    "queryParams": {
     "required": [
      "word"
     ],
     "properties": {
      "word": {
       "type": "string",
       "description": "1-50 English alphabetic characters."
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/2s-io-e1b4b3f0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 2s.io](https://www.zero.xyz/host/2s.io/llms.txt)