Check an x402 payment challenge before your agent pays: network, USDC, amount, payTo, facilitator.
Scored across 1 tool
Only one tool exists, so there is no possibility of misselection between tools. Its purpose — validating an x402 payment challenge before paying — is clearly stated and distinct from any other capability.
The single tool uses a clean snake_case, server-prefixed name (x402_precheck) that matches the server name. With one tool there is no convention mixing to penalize.
A single tool is defensible for a narrowly scoped preflight-check service, but the entire surface is one monolithic call. It sits at the thin end of the scale; splitting checks or adding a batch/endpoint-discovery variant would be reasonable.
The tool covers the full validation lifecycle for a 402 challenge: version, scheme, network/CAIP-2, asset, amount, payTo, EIP-712 domain, time window, facilitator reachability, policy expectations, and listing match. Minor gaps remain (e.g., no batch checks or historical/attestation retrieval), but the core domain is well covered.
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.
Inputs: url, method, challenge, expectPayTo, +4 more.
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
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Read-only on-chain receipt check for x402 payments; confirm settlement before trusting a tx.
Check an x402 endpoint's payment challenge and discovery metadata before paying.
Check an x402 endpoint before your agent pays it: does it answer, what it charges, did it deliver
Check an x402 endpoint before your agent pays it: avoid / caution / ok, proven on-chain.
Add one secure layer between your agents and this server.
