"author:something-agent" matching MCP servers:

Enables verification of x402 signed offers and receipts, plus signer-authorization evidence via did:web, DNS, and ERC-8004 lookups. Also provides unpaid preflight checks for x402 endpoints and ERC-8004 agent lookups.

Enables linting the unpaid path of an x402 endpoint by fetching a paid URL or inspecting a payment-required challenge you already hold, returning a verdict with severity-tagged findings, fixes, and a list of what went untested. Checks challenge fields, transport behavior, and discovery documents without ever signing or paying.