# x402check (x402check.dev)

Checks an x402 payment endpoint's verdict, payment address, price changes and uptime history before an agent pays it.

- Atlas card: https://inite.ai/en/atlas/x402check.dev
- Site: https://x402check.dev
- For: AI agents and their operators checking x402 endpoints before paying them
- Categories: finance
- Use not measured/100 · alive 100/100

## Used for

- verify a seller's payment address before signing
- compare candidate x402 sellers by verdict and price
- detect payment address or price changes on an endpoint

## Price

Not read yet.

## For developers

- OpenAPI: https://x402check.dev/openapi.json (10 paths)
- MCP server: dev.x402check/mcp (namespace; open on 2026-10-31, 4 tools)
- Read 2026-10-31

## MCP server, measured daily

Server: https://x402check.dev/mcp, checked every day since 2026-10-31 (2 checks).

- Answered: measuring, 2 daily checks so far
- Median first answer: 205 ms
- Sign-in: none
- Context its tool definitions take: about 605 tokens (4 tools)
- Tool definitions: A, 92/100
- Failing "params_described": 2 of 4 tools
- Method: https://inite.ai/en/atlas/mcp/report

## Your data

- Certifications stated: none
- Read 2026-10-31

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Source: INITE Atlas, https://inite.ai/en/atlas/x402check.dev. JSON: https://inite.ai/api/atlas/x402check.dev. MCP: https://inite.ai/api/mcp (atlas_lookup).