API Documentation

Introduction

Redcent provides pay-per-use APIs for AI agents and developers. Instead of managing API keys, rate limits, and subscriptions, you simply pay for each request using the x402 protocol.

Every API call costs 1¢ or less, paid in USDC on the Base network. Payments settle in ~200ms.

Authentication

Redcent uses the x402 protocol for authentication and payment. Instead of API keys, you include a signed payment token with each request.

# Every request includes a payment header
curl "https://api.redcent.io/companies/AAPL" \
  -H "X-PAYMENT: <signed-payment-token>"

The x402 client libraries handle this automatically. When you make a request:

1. The server responds with 402 Payment Required and the price
2. Your wallet signs a payment authorization
3. The request is retried with the payment header
4. You receive your data

All of this happens automatically in ~200ms.

Available APIs