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Pay MCP Server

by remit-md
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TypeScript
Local

@pay-skill/mcp

MCP server for Pay -- the complete x402 payment stack for AI agents. USDC on Base.

Gives any MCP-compatible client (Claude Desktop, Cursor, VS Code, custom frameworks) the full power of Pay: direct payments, tabs, x402 paywalls, service discovery, and wallet management. No CLI binary needed.

Setup

Claude Desktop

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "pay": {
      "command": "npx",
      "args": ["-y", "@pay-skill/mcp"]
    }
  }
}

VS Code / Cursor

Add to .vscode/mcp.json:

{
  "servers": {
    "pay": {
      "command": "npx",
      "args": ["-y", "@pay-skill/mcp"]
    }
  }
}

Claude Code

claude mcp add pay -- npx -y @pay-skill/mcp

That's it. On first run, the server generates a wallet and stores it in the OS keychain (Windows Hello, macOS Keychain, Linux Secret Service). Subsequent runs load it automatically.

Related MCP server: opendexter

Configuration

Env Var

Required

Default

Description

PAYSKILL_SIGNER_KEY

No

—

Optional override. Raw hex key or .enc keystore password. Not needed for normal use.

PAY_NETWORK

No

mainnet

mainnet (Base) or testnet (Base Sepolia)

Key Resolution (checked in order)

  1. OS keychain (default) — Loads from the OS credential store via keytar. On first run, a new keypair is generated and stored automatically.

  2. Encrypted keystore — If ~/.pay/keys/default.enc exists, PAYSKILL_SIGNER_KEY is used as the decryption password.

  3. Raw hex key — If PAYSKILL_SIGNER_KEY is a 64-char hex string, it's used directly. For dev/testing or importing an existing wallet.

  4. Auto-generate — If none of the above, generates a new keypair and stores it in the OS keychain.

Diagnostic Check

Verify everything is configured correctly:

npx @pay-skill/mcp --check

Output:

pay-mcp diagnostic check
  network: Base (chain 8453)
  api:     https://pay-skill.com/api/v1
  wallet:  0x1234...
  key:     keychain
  server:  OK (router: 0xABCD...)
  auth:    OK (balance: $50.00)

All checks passed. MCP server is ready.

Tools (15)

Payments

Tool

Description

pay_send

Direct USDC payment ($1 min). Confirmation thresholds: <$10 auto, $10-100 plan, >$100 explicit.

pay_request

HTTP request with x402 auto-payment. Handles 402 detection, direct/tab settlement, price skepticism.

Tabs (metered accounts)

Tool

Description

pay_tab_open

Open pre-funded tab ($5 min, $50 recommended). Provider charges per-call.

pay_tab_close

Close tab. Returns distribution breakdown (provider 99%, fee 1%, agent remainder).

pay_tab_charge

Charge against open tab (provider only).

pay_tab_topup

Add funds to open tab (agent only).

pay_tab_list

List tabs with idle/low-balance flags.

Wallet

Tool

Description

pay_status

Balance, locked/available funds, actionable suggestions.

pay_fund

Generate 1-hour funding link (Coinbase Onramp or direct USDC).

pay_withdraw

Generate 1-hour withdrawal link.

pay_mint

Mint testnet USDC (Base Sepolia only).

Discovery & Webhooks

Tool

Description

pay_discover

Search paid API services by keyword/category.

pay_webhook_register

Register webhook for payment events (HMAC-signed).

pay_webhook_list

List registered webhooks.

pay_webhook_delete

Delete a webhook.

Resources (5)

URI

Description

pay://wallet/status

Balance, tabs, locked/available

pay://wallet/tabs

All open tabs

pay://tab/{tab_id}

Single tab detail

pay://wallet/address

Wallet address

pay://network

Network config + contract addresses

Prompts (3)

Prompt

Description

pay-for-service

Guided: discover service, evaluate pricing, make request

review-tabs

Review tabs, flag idle, suggest close/topup

fund-wallet

Generate fund link, explain deposit process

Development

git clone https://github.com/pay-skill/pay-mcp.git
cd pay-mcp
npm install
npm run build
npm test                    # unit tests (mocked)
npm run test:acceptance     # testnet (requires PAYSKILL_TESTNET_KEY)

License

MIT

Part of Pay

Pay is the complete x402 payment stack -- gateway, facilitator, SDKs, CLI, and MCP server -- that lets AI agents pay for APIs with USDC on Base.

This server cannot be installed

A
license - permissive license
-
quality - not tested
B
maintenance

How are these scores calculated?

Maintenance

–Maintainers
–Response time
0dRelease cycle
14Releases (12mo)
Commit activity

Resources

Unclaimed servers have limited discoverability.

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