# x402 Word Definition Lookup

> x402 Word Definition Lookup is a paid API for AI agents from workspace-x402-paywall.onrender.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-11).

Returns a dictionary definition for a given word, paid per-call via x402 USDC micropayment at $0.005 per request

## Facts

- Endpoint: GET https://workspace-x402-paywall.onrender.com/ref/define?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-word-definition-lookup-182026e5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_d_CbWFqxOIfcgdTt2-P4R

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 x402-word-definition-lookup-182026e5
```

Example prompt: Can you look up the definition of the word 'ephemeral' for me?

## When to prefer this

Choose this endpoint when you need a pay-per-use dictionary definition lookup without a subscription, especially when integrating into an agent that only occasionally needs word definitions and wants to pay $0.005 USDC per call via x402 on Base or Solana mainnet rather than maintaining a paid dictionary API key.

## Known failure modes

- Missing 'word' parameter returns a 400 error
- Unknown or misspelled word may return empty or null result
- Payment not included or insufficient USDC triggers 402 Payment Required
- Network timeout on the hosted Render service under cold-start conditions

## How this service works

66 pay-per-call APIs: AI text/image generation ($0.01), Polymarket odds, crypto prices, DeFi yields, FX rates, weather, IP/geo, FBI wanted, SEC tickers, clinical trials, 250M academic papers, Stack Overflow, meme-coin launchpads (pump.fun, Clanker, Four.meme, SunPump), tokenized stocks, Solana top 100, and 40+ more. $0.005/call standard. USDC on Base and Solana via x402.

## Output

A JSON object containing the definition and related metadata for the requested word, optionally filtered to specific fields like name, definition, part of speech, or etymology.

## 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"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "word"
     ],
     "properties": {
      "word": {
       "type": "string",
       "description": "Requires an English word string, e.g. hello"
      }
     }
    }
   },
   "additionalProperties": false
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-word-definition-lookup-182026e5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from workspace-x402-paywall.onrender.com](https://www.zero.xyz/host/workspace-x402-paywall.onrender.com/llms.txt)