USDC payments for AI agents on Base — direct, tabs, x402 paywalls, discovery
Quick Install
Automated & IDE SetupCopy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.
Manual Client & Custom JSON ConfigExpand JSON ▾
Client Config & Setup
Choose your client or environment
Target File:
💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.
Documentation Overview
@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:
VS Code / Cursor
Add to .vscode/mcp.json:
Claude Code
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.
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)
- OS keychain (default) — Loads from the OS credential store via
keytar. On first run, a new keypair is generated and stored automatically. - Encrypted keystore — If
~/.pay/keys/default.encexists,PAYSKILL_SIGNER_KEYis used as the decryption password. - Raw hex key — If
PAYSKILL_SIGNER_KEYis a 64-char hex string, it's used directly. For dev/testing or importing an existing wallet. - 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:
Output:
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
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.
- Documentation
- Architecture
- SDK -- Python + TypeScript
- CLI -- Command-line tool
- pay-gate -- x402 payment gateway
- Protocol -- Smart contracts
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Frequently Asked Questions about Pay MCP
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CategoryFinance & Fintech
27Quality signal: Emerging · 27/100How this signal is calculated ▾
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Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.
Verified ownership8/20
Documentation & tools11/30
Adoption & activity1/15
Community engagement0/10
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