x402 endpoint checker

dev.workers.soloearn.x402-seller-kit/x402-checkerVersion 1.0.0

Test any x402 paid URL without paying: 402, PAYMENT-REQUIRED, USDC, amounts, payTo, EIP-712, CORS.

Status

Responds153 msNov 14, 2026, 14:29 UTCAnswered our handshake without sign-in.

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Data from the official MCP Registry, checked by run.zero. How we check

Streamable HTTP

https://x402-seller-kit.soloearn.workers.dev/mcpResponds153 msNov 14, 2026, 14:29 UTC

No sign-in

claude mcp add --transport http x402-checker https://x402-seller-kit.soloearn.workers.dev/mcp

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Settings > Connectors > Add custom connector
Name: x402-checker
Remote MCP server URL: https://x402-seller-kit.soloearn.workers.dev/mcp

{
  "mcpServers": {
    "x402-checker": {
      "url": "https://x402-seller-kit.soloearn.workers.dev/mcp"
    }
  }
}

code --add-mcp '{"name":"x402-checker","type":"http","url":"https://x402-seller-kit.soloearn.workers.dev/mcp"}'

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1 tools

Tools of x402 endpoint checker
	Description		Read-only	Idempotent	Open world
`check_x402_endpoint`Fetch a paid URL without paying and grade its x402 402 challenge: status, PAYMENT-REQUIRED header, version, network, USDC asset, amount units, payTo checksum, EIP-712 domain, CORS, HEAD parity and discovery metadata. Read-only; never signs or pays.	Fetch a paid URL without paying and grade its x402 402 challenge: status, PAYMENT-REQUIRED header, version, network, USDC asset, amount units, payTo checksum, EIP-712 domain, CORS, HEAD parity and discovery metadata. Read-only; never signs or pays.	No	Yes	Yes	Yes

Registry status: Active
Published: Oct 8, 2026
Updated: Oct 8, 2026
Website: https://x402-seller-kit.soloearn.workers.dev/tools/x402-checker⁠ (opens in a new tab)
Repository: Not given
Categories (suggested): Finance and payments E-commerceSuggested categories are assigned automatically from the registry text and may be wrong. Verified operators can correct them.
GDPR: Not declared