How do I install the A2a Payments skill?

Run npx skillmds@latest add modbender/a2a-payments in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is A2a Payments safe to use?

This skill has not completed SkillMD's automated safety review yet. Independent scanners report: SkillSpector: PASS, Skill Scanner: PASS. Capability flags: makes network calls. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with A2a Payments?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is A2a Payments free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published A2a Payments?

modbender (@modbender) published this skill. Their other Agent Skills are listed on their SkillMD profile.

A2a Payments by modbender — Agent Skill

Name: A2a Payments
Rating: 4.2 (5 reviews)
Author: modbender

File contents

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

---name: a2a-paymentsdescription: 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 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

Frequently asked questions

A2a Payments