x402-native spend policy and checkout repair API for AI agents before wallets sign paid requests.

Comprehensive overview of features and capabilities
400860 Agent Spend Firewall is an x402-native API for AI agents and API sellers. It helps agents decide whether they may spend before signing, verify paid x402 endpoints, and generate spend policy, prepay checks, receipt validation, anomaly rules, and checkout repair guidance. Public discovery assets include OpenAPI, llms.txt, llms-full.txt, buyer-guide.json, apis.json, agent-card, ai-catalog, and .well-known/x402. Pricing is $0.01 USDC per call on Base via x402.
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https://api.400860.xyz/