A2A Payments
Author: @Paparusi
Downloads: 41
Description: Blockchain USDC payments via APay — pay services, manage budgets, open streaming channels, and handle x402 protocol.
A2A Payments (APay)
Blockchain-native USDC payments for AI agents on Base chain. Pay for services, manage budgets, and handle micropayments.
Quick Start
Check your balance:
Use apay_check_balance to see my USDC balance
Pay a service:
Use apay_pay_service with serviceId "svc-123" and amount "0.50"
Available Tools Balance & Budget Tool Description apay_check_balance Check USDC balance, daily budget, spending limits apay_budget_check Verify if a specific amount is affordable apay_spending_history Get spending analytics and history Payments Tool Description apay_pay_service Pay a service (agent pays gas) apay_pay_signed Gasless signed payment (server submits on-chain) apay_estimate_cost Estimate cost including 0.5% platform fee Services Tool Description apay_list_services List available APay services apay_get_service Get detailed service info Payment Channels (Streaming) Tool Description apay_channel_status Check channel status apay_stream_open Open channel with USDC deposit apay_stream_pay Sign off-chain micropayment apay_stream_close Close channel (refund unspent) x402 Protocol Tool Description apay_x402_fetch Fetch URL with automatic x402 payment on HTTP 402 Workflows Pay for a tool execution apay_budget_check — verify affordability apay_estimate_cost — see total with fees apay_pay_service — execute payment Receive payment receipt with tx hash Streaming micropayments
For services that charge per-request (API calls, data feeds):
apay_stream_open — deposit USDC into channel apay_stream_pay — sign micropayments (off-chain, instant) apay_stream_close — settle on-chain, refund remainder x402 auto-payment
For services using the HTTP 402 payment protocol:
Use apay_x402_fetch with url "https://api.example.com/premium/data" and maxPayment "1.00"
The tool automatically detects 402 responses, pays the required amount, and retries the request.
Network Chain: Base (Coinbase L2) Stablecoin: USDC (6 decimals) Model: Escrow-based sessions with spending limits Testnet: base-sepolia for development