# x402 Paid API for AI Agents

> How autonomous agents can discover X402 Data API resources, inspect prices and schemas, pay per request in USDC on Base, and call JSON endpoints.

Intent: paid API for AI agents, pay per request API for agents, Base USDC x402 API

## Discovery

- OpenAPI: https://api.x402dataapi.com/openapi.json
- x402 catalog: https://api.x402dataapi.com/.well-known/x402-catalog.json
- Capabilities: https://api.x402dataapi.com/capabilities
- Pricing: https://api.x402dataapi.com/pricing

## Tags

- x402
- ai-agents
- paid-api
- base
- usdc
- bazaar


## Discovery flow

Read /llms.txt, fetch /openapi.json or /.well-known/x402-catalog.json, select an endpoint by value and price, then submit an x402 payment before retrying the paid request.

## Payment network

The production network is Base mainnet using CAIP-2 network id eip155:8453 and USDC payment requirements returned by the API.