# What Agents Buy (whatagentsbuy.com)

Buys and grades x402 pay-per-call APIs, publishing each payment receipt and a pre-payment clear, hold or abort verdict.

- Atlas card: https://inite.ai/en/atlas/whatagentsbuy.com
- Site: https://whatagentsbuy.com
- For: Developers and teams deciding which paid x402 APIs their AI agents should buy from
- Categories: dev
- Use 0/100 · alive 100/100

## Used for

- check whether an x402 API's answer is actually correct
- gate agent payments with a preflight check before paying
- see which x402 sellers are getting paid real demand

## Price

- no price printed (read 2026-10-26 on https://whatagentsbuy.com/p/weirdest-things-agent-can-buy)

## For developers

- OpenAPI: https://whatagentsbuy.com/openapi.json (9 paths)
- API docs: https://whatagentsbuy.com/api
- MCP server: com.whatagentsbuy/whatagentsbuy (namespace; open on 2026-10-25, 7 tools)
- Read 2026-10-25

## MCP server, measured daily

Server: https://whatagentsbuy.com/mcp, checked every day since 2026-10-26 (1 checks).

- Answered: measuring, 1 daily checks so far
- Median first answer: 428 ms
- Sign-in: none
- Context its tool definitions take: about 1375 tokens (7 tools)
- Tool definitions: B, 81/100
- Failing "params_described": 1 of 7 tools
- Failing "annotations": 7 of 7 tools
- Method: https://inite.ai/en/atlas/mcp/report

## Your data

- Certifications stated: none
- Read 2026-10-26

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Source: INITE Atlas, https://inite.ai/en/atlas/whatagentsbuy.com. JSON: https://inite.ai/api/atlas/whatagentsbuy.com. MCP: https://inite.ai/api/mcp (atlas_lookup).