{"service":"Coin Railz","description":"Multi-chain AI agent payment infrastructure — 60 services, 8 blockchains, API-key and x402 support.","authModes":[{"mode":"api_key","header":"X-API-KEY","alternativeHeader":"Authorization: Bearer <key>","description":"Prepaid credits — fastest path. Works with any HTTP client. No wallet required.","obtain":{"free_trial":{"description":"$5 free credits (~80-100 calls), no payment required","method":"GET","url":"https://coinrailz.com/api/m2m/credits/trial","curl":"curl https://coinrailz.com/api/m2m/credits/trial"},"hosted_checkout":{"description":"One-click checkout via Stripe — operator opens URL in browser, webhook auto-provisions key. Optional: enable auto-recharge so the card fires automatically when balance runs low.","method":"POST","url":"https://coinrailz.com/api/m2m/credits/checkout/session","body":{"amountUsd":10,"email":"optional@example.com","keyName":"optional label"},"bodyWithAutoRecharge":{"amountUsd":25,"autoRecharge":{"enabled":true,"thresholdUsd":5,"topUpUsd":25}},"curl":"curl -X POST https://coinrailz.com/api/m2m/credits/checkout/session -H \"Content-Type: application/json\" -d '{\"amountUsd\":10}'","curlWithAutoRecharge":"curl -X POST https://coinrailz.com/api/m2m/credits/checkout/session -H \"Content-Type: application/json\" -d '{\"amountUsd\":25,\"autoRecharge\":{\"enabled\":true,\"thresholdUsd\":5,\"topUpUsd\":25}}'","note":"Returns checkoutUrl + retrievalToken. Pay in browser, then poll /api/m2m/credits/checkout/status/:sessionId?token=<retrievalToken> for your key. With autoRecharge, card is vaulted and fires automatically when balance drops below thresholdUsd."},"direct_card":{"description":"Programmatic card charge via Stripe PaymentMethod (requires pre-built pm_...)","method":"POST","url":"https://coinrailz.com/api/m2m/credits/purchase","body":{"paymentMethodId":"pm_...","amountUsd":10,"idempotencyKey":"uuid-v4"},"note":"Requires a Stripe PaymentMethod ID — use Stripe.js or Stripe CLI to create one."}},"tiers":[{"amountUsd":5,"label":"Intro","description":"~80-100 service calls — ideal for first test run"},{"amountUsd":10,"label":"Starter","description":"~200 service calls at avg pricing"},{"amountUsd":25,"label":"Growth","description":"~500 service calls, best for recurring agents"},{"amountUsd":100,"label":"Pro","description":"~2,000 service calls, high-volume operations"}],"firstCall":{"description":"After obtaining a key, call any /x402/* service","curl":"curl -X POST https://coinrailz.com/x402/first-call -H \"X-API-KEY: cr_live_...\" -H \"Content-Type: application/json\" -d '{}'","price_usd":0.05}},{"mode":"x402_onchain","header":"X-PAYMENT","description":"On-chain USDC per-call payments using HTTP 402 protocol. No API key required.","supportedChains":["base","ethereum","polygon","arbitrum","solana"],"facilitators":["https://api.cdp.coinbase.com/platform/v2/x402","https://x402.dexter.cash"],"discoveryDocs":{"manifest":"https://coinrailz.com/.well-known/x402.json","instructions":"https://coinrailz.com/.well-known/agent-instructions.json","agentCard":"https://coinrailz.com/.well-known/agent-card.json","webmcp":"https://coinrailz.com/.well-known/webmcp.json","awi":"https://coinrailz.com/.well-known/awi.json","mpp":"https://coinrailz.com/.well-known/mpp.json","mcpIntegration":"https://coinrailz.com/.well-known/mcp-integration.json","integrationGuide":"https://coinrailz.com/mcp-integration-guide"},"firstCall":{"url":"https://coinrailz.com/x402/first-call","price_usd":0.05,"note":"Send HTTP request. Receive 402 challenge. Use a CDP or Dexter wallet to sign and retry."}}],"catalogUrl":"https://coinrailz.com/x402/catalog","supportedServices":60,"docsUrl":"https://coinrailz.com/.well-known/agent-instructions.json"}