Browse the AI payment ecosystem by category

HTTP 402 "Payment Required" — the reference rail for charging agents per request.

An open standard for autonomous machine-to-machine payments.

Mandates, spending limits and delegated authority for agent payments.

End-to-end agentic commerce: discovery, negotiation, payment, confirmation.

Tooling for autonomous agents that pay each other.

HTTP 402 settled in Bitcoin over the Lightning Network.

Charge AI agents per tool call on the Model Context Protocol.

Open-source tooling that settles agent payments in USDC on Solana.

x402 tooling for Base — the home network of the protocol.

Accept agent payments in USDC across Ethereum and EVM chains.

The stablecoin that settles almost every agent payment.

The largest language slice of the x402 ecosystem.

Add a pay-per-request paywall to FastAPI, Flask & Python clients.

High-performance x402 payment handling in Rust.

x402 middleware and clients for Go services.

Services that verify and settle x402 payments for you.

Wallets with spending limits, built for autonomous agents.

Drop-in libraries to add or consume x402 payments.

Charge cents — or fractions of a cent — per request.

Give your autonomous agents a way to pay for what they use.

Self-directed agents that earn and spend on their own.

Meter and monetize LLM-powered endpoints per request.

Monetize the MCP tools you expose to Claude.

Where agent payments meet on-chain finance.

Tooling from and around Coinbase’s agent-payments stack.