MCPFax Payer Graph & Coverage-Gated Screening Signals

Use this endpoint when you need to evaluate the payer graph and coverage-gated screening signals for x402 endpoints before committing to a transaction or onboarding a payer or seller. Prefer this over generic credit grading (MCPFax credit grade endpoint) when you specifically need raw payer graph topology and coverage signals rather than a summarized credit score. Best suited for know-your-agent workflows, marketplace due diligence, and pre-transaction screening.

• Missing or invalid query parameters may return empty or null payer graph
• Endpoint or payer not found in coverage data returns empty signals
• Payment of 0.002 USDC required per call; unpaid requests return 402 error
• Sparse coverage data for new or low-volume endpoints may yield low-confidence signals
• Rate limiting or worker errors may return 5xx responses