{"platform":"Coin Railz","description":"Universal x402 payment infrastructure for the AI agent economy. Pay-per-call USDC micropayments on Base. No API keys, no subscriptions required.","version":"3.0.0","updated":"2026-07-13","total_services":76,"payment":{"protocol":"x402","currency":"USDC","primary_network":"Base (eip155:8453)","also_accepted":["Solana mainnet (solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp)"],"facilitator":"https://api.cdp.coinbase.com/platform/v2/x402","how_to_pay":"Send POST to any /x402/* endpoint. Receive HTTP 402 with payment requirements. Submit USDC payment on Base. Include X-PAYMENT header on retry.","onboarding_endpoint":"https://coinrailz.com/x402/first-call","onboarding_price_usd":0.05},"api_key_path":{"description":"Prefer API keys? 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