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a2a-payments

Blockchain USDC payments via APay — pay services, manage budgets, open streaming channels, and handle x402 protocol.

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包含的文件(1)

  • SKILL.md3.0 KB

SKILL.md(原文)

安装前可以查看交给 AI 代理的指令内容。

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

ToolDescription
apay_check_balanceCheck USDC balance, daily budget, spending limits
apay_budget_checkVerify if a specific amount is affordable
apay_spending_historyGet spending analytics and history

Payments

ToolDescription
apay_pay_servicePay a service (agent pays gas)
apay_pay_signedGasless signed payment (server submits on-chain)
apay_estimate_costEstimate cost including 0.5% platform fee

Services

ToolDescription
apay_list_servicesList available APay services
apay_get_serviceGet detailed service info

Payment Channels (Streaming)

ToolDescription
apay_channel_statusCheck channel status
apay_stream_openOpen channel with USDC deposit
apay_stream_paySign off-chain micropayment
apay_stream_closeClose channel (refund unspent)

x402 Protocol

ToolDescription
apay_x402_fetchFetch URL with automatic x402 payment on HTTP 402

Workflows

Pay for a tool execution

  1. apay_budget_check — verify affordability
  2. apay_estimate_cost — see total with fees
  3. apay_pay_service — execute payment
  4. Receive payment receipt with tx hash

Streaming micropayments

For services that charge per-request (API calls, data feeds):

  1. apay_stream_open — deposit USDC into channel
  2. apay_stream_pay — sign micropayments (off-chain, instant)
  3. 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

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