Welcome to Blockchain0x

Blockchain0x is the payments API for autonomous software. It gives an AI agent (or
any backend service) its own on-chain wallet and a clean HTTP API to send and
receive USDC on Base - test mode on Base Sepolia, live mode on Base mainnet, the
same code for both.

If you can call an HTTP endpoint, your agent can move money. No smart contracts to
write, no key management to build, no chain-specific plumbing.

Start here

Quickstart - your agent sends a confirmed USDC payment on
Base testnet in under 10 minutes.
Introduction - what Blockchain0x is and what you can build.
Authentication - API keys, scopes, and key levels.
Test mode vs live mode - networks, the faucet, and X-Network.

Build with an SDK

Same resource surface in every language - pick yours on the
SDKs overview: Node, Python, Go, Ruby, plus the
x402 HTTP-402 pay-per-call family.

Common tasks

Set up and fund an agent
Send payments and idempotency
Receive payments
Webhooks and signature verification
Going live

Prefer the raw surface? The API reference is generated from our
OpenAPI spec, with SDK code samples on every endpoint.