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MoonPay

v0.2.1API Key

Fiat↔crypto on/off-ramp. Broader coverage than UnblockPay (100+ assets, 160+ countries) including BR Pix onramp. Sell-side flows enable agents paying out in crypto.

20 tools6 env vars🌐 GLOBALstable on npm

What your agent can do

MoonPay gives your agent 20 tools it calls directly — pick the ones it needs, in Claude, Cursor, or any MCP client.

  • get_buy_quotePreview a fiat -> crypto buy quote in real time. Use this before create_buy_transaction to show the end user the exact crypto amount, fees, and effective rate.
  • create_buy_transactionCreate a buy transaction (fiat -> crypto). The returned object contains status plus — depending on method — redirect URL for hosted checkout, Pix QR data, or card auth next steps.
  • get_buy_transactionRetrieve a buy transaction (fiat -> crypto) by its MoonPay id. Returns current status and settlement detail.
Example call
// Your agent calls a tool directly — no glue code.
// CodeSpar's managed tier handles OAuth2, token rotation and rate limits.
const result = await session.call("get_buy_quote", { /* ... */ });

Install

terminal
$ npm install @codespar/mcp-moonpay

Quickstart

Add this entry to your claude_desktop_config.json (or any MCP-compatible client config).

claude_desktop_config.json
{
  "mcpServers": {
    "moonpay": {
      "command": "npx",
      "args": [
        "-y",
        "@codespar/mcp-moonpay"
      ],
      "env": {
        "MOONPAY_API_KEY": "<your_moonpay_api_key>"
      }
    }
  }
}

After restart, your agent can call any of the 20 tools below — try get_buy_quote first.

Environment variables · 6

Required to authenticate the server. Stored encrypted when using CodeSpar managed hosting.

MOONPAY_API_KEY
requiredsecret

MoonPay REST API key (sandbox or production — the key selects the environment)

MOONPAY_PUBLISHABLE_KEY
optional

MoonPay publishable key used as `apiKey` in signed widget URLs (required for sign_buy_url / sign_sell_url).

MOONPAY_SECRET_KEY
optionalsecret

MoonPay secret key used to HMAC-SHA256 sign widget URLs (required for sign_buy_url / sign_sell_url).

MOONPAY_BASE_URL
optional

MoonPay API base URL. Defaults to https://api.moonpay.com.

MOONPAY_BUY_WIDGET_URL
optional

MoonPay buy widget base URL. Defaults to https://buy.moonpay.com.

MOONPAY_SELL_WIDGET_URL
optional

MoonPay sell widget base URL. Defaults to https://sell.moonpay.com.

Available tools · 20

Each tool is independent — your agent loads only what it needs to reduce context and response time.

READget_buy_quote
Preview a fiat -> crypto buy quote in real time. Use this before create_buy_transaction to show the end user the exact crypto amount, fees, and effective rate.
WRITEcreate_buy_transaction
Create a buy transaction (fiat -> crypto). The returned object contains status plus — depending on method — redirect URL for hosted checkout, Pix QR data, or card auth next steps.
READget_buy_transaction
Retrieve a buy transaction (fiat -> crypto) by its MoonPay id. Returns current status and settlement detail.
READlist_buy_transactions
List buy transactions with optional filters. Used for reconciliation and agent-driven monitoring.
READget_sell_quote
Preview a crypto -> fiat sell quote in real time. Use this before create_sell_transaction to show the end user the exact fiat amount, fees, and effective rate.
WRITEcreate_sell_transaction
Create a sell transaction (crypto -> fiat). Used for agents that need to pay out in local fiat after receiving crypto.
READget_sell_transaction
Retrieve a sell transaction (crypto -> fiat) by its MoonPay id.
DELETErefund_sell_transaction
Request a refund on an off-ramp (sell) transaction. Used when the destination bank rejects payout or the user disputes the trade. Reason codes are MoonPay-defined.

Compatible frameworks

MCP is a protocol — any framework that speaks it can mount this server.

Claude Agent SDKAnthropic
OpenAI AgentsOpenAI
Vercel AI SDKVercel
LangChainLangChain
LlamaIndexLlamaIndex
CrewAICrewAI
MastraMastra
Any MCP clientProtocol

Frequently asked questions

Run `npx -y @codespar/mcp-moonpay` and add the config block above to your MCP client — Claude, Cursor, VS Code, or any MCP-compatible client. No build step, no SDK required. Prefer hosted? CodeSpar's managed tier runs it for you with auth handled.
MoonPay — MCP server · 20 tools | CodeSpar