send21 MCP MCP server

An official non-custodial payment MCP server that allows AI agents to create verifiable payment drafts and pay links for BTC, USDC, USDT, and EURC. It enables agents to generate transaction templates, lock fiat-pegged rates, and manage webhooks without ever holding private keys or funds.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-05Operated by send21

MCP endpoint (Streamable HTTP)

https://send21.io/mcp

Vendor documentation

What you can do with it

Create non-custodial payment drafts for crypto transactions
Generate fiat-priced pay links with hosted QR pages
Fetch transaction templates for local signing
Manage webhook events for payment confirmation

Tools advertised by the last live check:

get_transaction_template
get_fee_schedule
create_payment_request
list_address_book
get_draft
get_payment_request
get_rate
create_draft
get_draft_status

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http send21-mcp https://send21.io/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add send21-mcp --url https://send21.io/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable send21-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "send21-mcp": {
      "url": "https://send21.io/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "send21-mcp": {
      "type": "streamableHttp",
      "url": "https://send21.io/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start send21-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "send21-mcp": {
      "type": "http",
      "url": "https://send21.io/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http send21-mcp https://send21.io/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "send21-mcp": {
      "url": "https://send21.io/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "send21-mcp": {
      "serverUrl": "https://send21.io/mcp"
    }
  }
}

See all 128

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