coinvoyage-paykit-claudeplugin

Claude Code plugin for integrating CoinVoyage — a non-custodial, multi-chain crypto payment gateway — into any app you build with Claude.

Bundles two surfaces:

Skill (coinvoyage-payments) — triggers whenever Claude is helping with crypto payments, checkout, stablecoins, or web3 payment work. Guides the integration end to end: server-side PayOrder creation, React PaymentWidget, webhook signature verification, and REST API fallback for non-JS stacks.
MCP server (@kingpeque/coinvoyage-mcp) — gives Claude 15 tools for calling the CoinVoyage API directly: create PayOrders, check status, manage webhooks, get swap quotes, and more.

Community-maintained integration. Not officially affiliated with CoinVoyage.

Install

bash

/plugin install KingPeque/coinvoyage-paykit

You'll be prompted at install for:

Field	Required	Notes
`api_key`	yes	Your public API key from https://dashboard.coinvoyage.io → Developers
`api_secret`	optional	Needed for SALE/REFUND orders, webhook management, and fee claims. Leave blank to restrict Claude to read + DEPOSIT flows only.
`api_base_url`	optional	Defaults to `https://api.coinvoyage.io`

The secret is stored in your system keychain via Claude Code's sensitive-config pathway — it never lands in a file you'd commit.

What you can now say to Claude

Once installed, these kinds of requests will activate the skill and/or MCP tools:

"Add crypto payments to my Next.js checkout"
"I want to accept Bitcoin on from my site"
"Build a donation page that takes any crypto while I settle to USDC on base"
"Create a $25 test invoice and settle to USDC on Base heres my wallet"
"Register a webhook at https://mysite.com/api/webhooks/coinvoyage for completed orders"

What's inside

Code

coinvoyage-paykit/
├── .claude-plugin/
│   └── plugin.json              # Plugin manifest (prompts user for API keys)
├── mcp.json                     # Declares the bundled MCP server
├── skills/
│   └── coinvoyage-payments/
│       └── SKILL.md             # Integration guide + trigger description
├── mcp-server/                  # Source for @kingpeque/coinvoyage-mcp (npm)
│   ├── src/index.ts
│   ├── package.json
│   └── tsconfig.json
├── README.md
└── LICENSE

Supported chains

Bitcoin, Solana, Ethereum, Optimism, Arbitrum, Base, BSC, Polygon, Sui — plus any ERC-20 / SPL / native token on these chains. See full chain ID reference in the supported_chains MCP tool.

Pricing (CoinVoyage's, not this plugin's)

1.5% per successful payment
0% offramp
Merchants can add a custom percentage fee on top
This plugin is free and MIT-licensed. Volume discounts on CoinVoyage fees: help@coinvoyage.io.

Security posture

No secrets in this repo. Everything sensitive lives in your Claude Code config, injected into the MCP server at runtime.
Per-user keys. Every builder uses their own CoinVoyage API key. Nothing is centrally hosted; there's no shared server to compromise.
Minimal network surface. The MCP server only talks to api.coinvoyage.io (or your configured override).
HMAC-SHA256 authentication for privileged operations (SALE/REFUND/webhooks/fee claims).
Open source. Read the MCP server source at mcp-server/src/index.ts — it's under 300 lines.

Local development

bash

git clone https://github.com/KingPeque/coinvoyage-paykit
cd coinvoyage-paykit/mcp-server
npm install
npm run build
# Point your MCP client at ./mcp-server/dist/index.js with COINVOYAGE_API_KEY set

Run the skill locally by symlinking skills/coinvoyage-payments/ into ~/.claude/skills/ (or installing the plugin in dev mode).

Contributing

Issues and PRs welcome at https://github.com/KingPeque/coinvoyage-paykit/issues. Please don't commit API keys, secrets, or wallet addresses.

License

MIT — see LICENSE.

Coinvoyage README