MCP.Market

send21 MCP server

online · 100% uptime
by send21io·io.github.send21io/mcp·v1.7.0
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Crypto pay links and API for people and AI agents. BTC, Lightning, USDC, USDT, EURC, SOL, ETH.

A85/100grade A
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Safety scan
A85/100

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Adoption
Growing

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If you have run it, two minutes of your experience saves the next person an afternoon.

send21 tools

Tool list not cached yet. `describe` through the gateway fetches it live.

Not scanned yet. New listings are scanned within a day or two of arriving.

How send21 compares

Against every graded Finance MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
85/100
higher than 80% of 1,761 Finance servers
Uptime
100%
of our recent checks; the typical remote Finance server answers 100%
Response time
140 ms
faster than 77% of 1,133 Finance servers

Release history: 6 versions in the registry since 2026-09-06, latest 2026-10-22, typically one every 6 days.

Install send21 in Claude Code, Cursor or VS Code

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

What the publisher says

From the send21 repository's README, as published. We do not edit it. Read it on GitHub

send21 MCP

Remote Model Context Protocol server for send21 — non-custodial payment drafts and pay links.

send21 prepares payment instructions for BTC, USDC, USDT, and EURC. The payer signs in their own wallet. send21 never holds keys, never signs, and never broadcasts.

Live endpoint (Streamable HTTP): https://send21.io/mcp Descriptor: https://send21.io/.well-known/mcp.json Agent docs: https://send21.io/llms.txt OpenAPI: https://send21.io/swagger/v1/swagger.json Site: https://send21.io

Connect

Point an MCP client at the remote server:

{
  "mcpServers": {
    "send21": {
      "url": "https://send21.io/mcp",
      "transport": "streamable-http",
      "headers": {
        "Authorization": "Bearer s21_YOUR_API_KEY"
      }
    }
  }
}
  • Create scoped API keys at https://send21.io/api-keys (s21_…).
  • Scopes such as drafts:write, drafts:read, webhooks:manage cannot move funds.
  • tools/list works without authentication.

What the tools do

Typical tools (see live tools/list): create drafts / payment requests, fetch transaction templates, rates, and fee schedule. Signing and broadcast stay in the user’s wallet.

Brand

send21 — Direct. Non-custodial. Yours. Contact: integration@send21.io

License

MIT

Nothing above is checked by us. What we check is on the safety report.

Grade history

  • 2026-10-16restoreB → Ascore 85

send21: common questions

Is send21 MCP server safe?
Yes, by our scan: it is graded A (85/100). Read the send21 safety report
How do I install send21?
It runs remotely at send21.io. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
Does send21 need an API key?
Yes. The registry entry asks for Authorization.
Is send21 maintained?
The last commit was 22 days ago (2026-10-13). The latest release is v1.7.0.
Is send21 up?
100% of our last 28 checks got an answer. We check remote servers about four times a day.
What can I use instead of send21?
Servers from other publishers that do the same job: Coinbase Commerce MCP server, Blockrun MCP server and Agent402.Tools: pay-per-call web tools MCP server. Compare all send21 alternatives.
How does send21 compare with other Finance MCP servers?
safety score 85/100 (higher than 80% of 1,761 Finance servers); uptime 100% (of our recent checks; the typical remote Finance server answers 100%); response time 140 ms (faster than 77% of 1,133 Finance servers). Full comparison.

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