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Documentation Index

Fetch the complete documentation index at: https://docs.httpayer.com/llms.txt

Use this file to discover all available pages before exploring further.

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Overview

HTTPayer acts as a payment router for APIs using the 402 Payment Required status code and x402 Protocol. The proxy handles:
  • Payment verification and processing
  • Cross-chain USDC settlements
  • Request forwarding to destination endpoints
  • Response delivery to clients

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Authentication

Only account-based endpoints (/proxy, proxy/sim, /balance) require an API key; /relay is an x402-enabled endpoint.

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CORS

Cross-origin requests are disabled by default. The server only allows cross-origin requests from origins listed in the CORS_ORIGIN environment variable (comma-separated). If you are integrating from a browser, contact the HTTPayer team to have your origin allowlisted.

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Base URL

  • https://api.httpayer.com

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Getting Started

The API endpoints are organized into the following groups:
  • Payment Relay: Core payment processing and relay endpoints
  • Simulation: Test payment flows without executing transactions
  • Account Management: Check balances and limits
  • Webhooks: Async refund tracking
  • LLM Endpoints: AI-powered translation and chat features
  • System: Health checks and configuration
Browse the endpoint documentation in the sidebar to get started.