x402 Precheck

dev.workers.w0arvg81zlgf.x402-precheck/precheckVersion 1.0.0

Check an x402 payment challenge before your agent pays: network, USDC, amount, payTo, facilitator.

Status

Responds233 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-precheck.w0arvg81zlgf.workers.dev/mcpResponds233 msNov 14, 2026, 14:29 UTC

No sign-in

claude mcp add --transport http precheck https://x402-precheck.w0arvg81zlgf.workers.dev/mcp

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Settings > Connectors > Add custom connector
Name: precheck
Remote MCP server URL: https://x402-precheck.w0arvg81zlgf.workers.dev/mcp

{
  "mcpServers": {
    "precheck": {
      "url": "https://x402-precheck.w0arvg81zlgf.workers.dev/mcp"
    }
  }
}

code --add-mcp '{"name":"precheck","type":"http","url":"https://x402-precheck.w0arvg81zlgf.workers.dev/mcp"}'

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1 tools

Tools of x402 Precheck
	Description		Read-only	Idempotent	Open world
`x402_precheck`Check an x402 payment challenge BEFORE your agent pays (0.002 USDC per check via x402; free trial 1024 checks/IP/UTC day). Give an endpoint URL (fetched unpaid, never paid) or paste a 402 challenge. Validates x402 version, scheme, network (CAIP-2, testnet flag), canonical USDC asset, amount sanity, payTo format/EIP-55 checksum/zero address, EIP-712 domain, payment window, facilitator reachability and scheme/network support, optional maxPriceUsd / expectPayTo / expectNetwork policy, and PayAI Bazaar listing match. Returns per-check pass/warn/fail and a verdict: looks_ok, review or do_not_pay. Informational; invalid input and failed checks are not charged.	Check an x402 payment challenge BEFORE your agent pays (0.002 USDC per check via x402; free trial 1024 checks/IP/UTC day). Give an endpoint URL (fetched unpaid, never paid) or paste a 402 challenge. Validates x402 version, scheme, network (CAIP-2, testnet flag), canonical USDC asset, amount sanity, payTo format/EIP-55 checksum/zero address, EIP-712 domain, payment window, facilitator reachability and scheme/network support, optional maxPriceUsd / expectPayTo / expectNetwork policy, and PayAI Bazaar listing match. Returns per-check pass/warn/fail and a verdict: looks_ok, review or do_not_pay. Informational; invalid input and failed checks are not charged.	Not declared	Yes	Not declared	Yes

Registry status: Active
Published: Nov 10, 2026
Updated: Nov 10, 2026
Website: https://x402-precheck.w0arvg81zlgf.workers.dev/⁠ (opens in a new tab)
Repository: Not given
Categories (suggested): Finance and paymentsSuggested categories are assigned automatically from the registry text and may be wrong. Verified operators can correct them.
GDPR: Not declared