Add Checker FX gateway to the service directory

[jackchonghc]

Motivation

• Service name: Checker FX gateway
• Live service URL: https://checker-mpp-fx-gateway.replit.app
• Provider URL: https://checker.finance
• OpenAPI or API reference URL: https://checker-mpp-fx-gateway.replit.app/openapi.json

Summary

• The service is live and accepts MPP payments.
• This PR adds or updates its entry in schemas/services.ts.
• Listed endpoints, prices, and payment methods match the live service.
• Public documentation and icon URLs are stable and accessible at the published origin.
• pnpm generate:discovery succeeds.
• pnpm check:types passes.
• pnpm build succeeds.

Key design considerations

• Integration: Third-party data gateway. The service exposes sanitized indicative FX quotes over a direct HTTP endpoint and streamable HTTP MCP.
• Payment methods and intents: Tempo MPP v2 session payments on Moderato (chain ID 42431) using PathUSD at 1,000 base units ($0.001) per request. The live MPP challenge is the source of truth for the recipient, currency, and network.
• Provider relationship: Checker provides the upstream market data. This gateway does not execute trades, issue assets, or expose upstream venue identifiers; responses are sanitized before they leave the gateway.
• Directory fit: The service belongs in the data category and is intended for agents and developers that need paid, indicative FX market data. The listed MPP routes are GET /v1/prices and POST /mcp; the separate Base Sepolia x402 route is intentionally not listed here.

The API artifact has been republished. The public OpenAPI document is live at https://checker-mpp-fx-gateway.replit.app/openapi.json, and the published favicon is accessible at https://checker-mpp-fx-gateway.replit.app/favicon.svg.

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[github-actions]

🔀 Changed Services

✅ Added

• checker-fx-gateway