# Datamuse Antonyms Lookup

> Datamuse Antonyms Lookup is a paid API for AI agents from clonecho.builda.company, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Returns antonyms for a given word using the Datamuse rel_ant linguistic relation

## Facts

- Endpoint: POST https://clonecho.builda.company/x402/s/datamuse-antonyms
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/datamuse-antonyms-lookup-ecde29ee
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_YMO0wELssv77Xg2nfLGRv

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 datamuse-antonyms-lookup-ecde29ee -d '<json body>'
```

Example prompt: What are the antonyms for the word 'happy'?

## When to prefer this

Use this endpoint when you need antonyms specifically for a single word and want a simple, pay-per-call API backed by the Datamuse lexical database. Prefer this over building your own NLP pipeline or using a thesaurus API that bundles synonyms, antonyms, and other relations together when you only need antonym data.

## Known failure modes

- Word not found or no antonyms exist — returns empty array
- Missing or malformed 'word' parameter — may return error or empty result
- Rate limiting or payment failure — returns 402 Payment Required
- Network timeout or service unavailability — returns 5xx error

## How this service works

Antonyms for a given word using the Datamuse rel_ant relation (param: word). Query: ?word= Returns JSON.

## Output

A JSON array of antonym words related to the input word, sourced from the Datamuse rel_ant relation. Each result typically includes the word and a score indicating relevance.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/datamuse-antonyms-lookup-ecde29ee/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from clonecho.builda.company](https://www.zero.xyz/host/clonecho.builda.company/llms.txt)