Concepts
How a paid call works
What happens when your agent pays for a call.
Delegated Signing grant
What you authorize when you create your wallet.
Source trust tiers
Premium, Standard and Open Ecosystem.
Open Ecosystem
Paying x402 APIs that have no verification.
x402 + EIP-3009
The payment protocol in detail.
Sandbox testing
Test calls on Base Sepolia with test USDC.