send21
Non-custodial payment drafts/pay links for BTC, USDC, USDT, EURC. Never holds keys.
Open source Repository Open in the app JSON README (API)
About
Non-custodial payment drafts/pay links for BTC, USDC, USDT, EURC. Never holds keys.
Details
- Kind
- MCP servers
- Topic
- Finance & crypto
- Publisher
- send21io
- Origin
- official
- Category
- ferramentas
- Transport
- http
- Version
- 1.0.0
- Last push
- 2026-09-06T05:27:51Z
- Repository state
- ativo
- License
- MIT
- Added
- 2026-09-06 06:00:46
- Updated
- 2026-09-06 06:00:46
- Origin id
io.github.send21io/mcp
README
# send21 MCP
Remote [Model Context Protocol](https://modelcontextprotocol.io/) 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:
```json
{
"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