English dictionary lookup

$0.003 per call · failed calls are never charged · no account or API key needed

Definitions of an English word from Wiktionary, grouped by part of speech, with example sentences where Wiktionary gives them, plus the page link and the CC BY-SA attribution to show. Use for writing help, vocabulary, translation checks and word games.

Run it free (25 free calls) Buy credits by card (from $5) Example result (JSON)

Inputs

NameTypeDescription
word (required)stringAn English word

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://agent-data-tools.revmesh2074.workers.dev/dictionary?word=serendipity"

Or one of your 25 free calls, no key:

curl "https://agent-data-tools.revmesh2074.workers.dev/dictionary?word=serendipity&trial=1"

Without a key, the same URL answers 402 Payment Required with x402 and MPP terms, so an agent with a wallet pays per call in USDC (Base, Polygon, Arbitrum, Monad, World Chain or Tempo) and retries.

Example result

{
  "word": "serendipity",
  "meanings": [
    {
      "partOfSpeech": "Noun",
      "definitions": [
        {
          "definition": "An unsought, unintended, and/or unexpected, but fortunate, discovery.",
          "example": null
        }
      ]
    }
  ],
  "url": "https://en.wiktionary.org/wiki/serendipity",
  "licence": "CC BY-SA 4.0",
  "attribution": "Definitions from the Wiktionary entry \"serendipity\" by its contributors, licensed CC BY-SA 4.0"
}

From an AI agent (MCP)

Add the MCP server to Claude, Cursor or any MCP client. This tool is dictionary, and the first 25 successful calls are free:

https://agent-data-tools.revmesh2074.workers.dev/mcp

Related tools