USDC Payments
Stablecoin Infrastructure for AI
USDC on Base is the native currency of the AI payment economy. Dollar-stable, instant, and programmable — enabling AI agents, APIs, and developers to transact without volatility risk or $0.30 minimum fees.
Why USDC for AI Payments
USDC Payment Use Cases
Frequently Asked Questions
What is USDC and why use it for payments?
USDC (USD Coin) is a regulated stablecoin always worth $1 USD, issued by Circle. For AI payments and API micropayments, USDC on Base enables sub-cent transactions with near-instant settlement — impossible with traditional payment rails.
How do USDC payments work with x402?
The x402 protocol uses USDC on Base as its primary payment currency. When an API returns HTTP 402, the client sends USDC and retries with cryptographic proof. Settlement takes ~2 seconds.
Can AI agents pay with USDC automatically?
Yes. Using AI agent wallets like Coinbase AgentKit or CDP SDK, agents autonomously hold USDC, sign transactions, and pay for services — all without human approval.
Which chain is best for USDC in 2026?
Base (Coinbase's Ethereum L2) is the recommended chain. Fees under $0.001, ~2 second finality, and natively supported by the x402 protocol. Circle also supports USDC on Ethereum, Solana, Polygon, and 12+ other chains.
Find USDC Payment Libraries
mpp.best tracks 1,500+ open-source projects for USDC payments, x402 middleware, and AI agent wallets.