The send21 MCP server,
connected in one click.
Non-custodial payment drafts/pay links for BTC, USDC, USDT, EURC. Never holds keys. Connect the official send21 MCP server to Claude, ChatGPT, or Cursor through gate — one gateway URL, no config files, security-checked.
Free to start · No credit card · No hosting needed
Add send21 to your AI in one minute
Pick your client. Copy, paste, done — or let gate handle sign-ins and policies for you.
claude mcp add --transport http send21 https://send21.io/mcpRun in your terminal, then restart Claude Code.
send21 · https://send21.io/mcp
What your AI can do with send21
Real prompts you can type the moment it's connected — no setup, no docs to read.
“Use “get_transaction_template”: Get the multi-output transaction template for a draft: Bitcoin Core walletcreatefundedpsbt arguments and Electrum/Sparrow pay-to-many CSV. T.”
“Use “get_fee_schedule”: Get the public send21 fee schedule: tiered percent by payment size in USD, min/max fee, and dust limit. No authentication needed.”
“Use “create_payment_request”: Create a payment request / checkout pay link (you are the RECEIVER asking to get paid). Price in any of 165 fiat currencies; the payer opens.”
“Use “list_address_book”: List the account's saved addresses (label, address, network, direction: Sending = recipients the owner pays, Receiving = the owner's own add.”
How secure is the send21 MCP server?
Every server in the gate directory has to pass the same four checks before your AI can touch it. Here's how send21 holds up.
Security grade A
gate scanned 9 tools on Sep 9, 2026 for prompt injection and risky tool definitions — nothing to flag.
Official endpoint
Operated by send21 (send21.io) at its documented MCP endpoint — not a third-party mirror or community re-host.
No sign-in needed
This server only exposes public data — no account and no credentials are involved when you connect.
Scanned before it goes live
gate checks every tool for prompt injection, hidden instructions, data-exfiltration hints, and over-broad permissions before the server is available through your gateway.
Watched for drift
If send21 adds or changes tools later, gate re-scans and alerts you — before your AI acts on the change.
Connected in three steps
Connect your gate
Add one gateway URL to Claude, ChatGPT, or any MCP client. One-time setup, about two minutes.
Pick send21
Choose send21 in the gate directory. No sign-in needed.
Use it anywhere
send21's tools are live in every AI client you've connected — with rules and logging built in.
Free to start · No credit card · No hosting needed
The actual tools send21 exposes
Fetched live from the official endpoint and re-checked daily by gate — not marketing copy.
get_transaction_template — Get the multi-output transaction template for a draft: Bitcoin Core walletcreatefundedpsbt arguments and Electrum/Sparrow pay-to-many CSV. T
get_fee_schedule — Get the public send21 fee schedule: tiered percent by payment size in USD, min/max fee, and dust limit. No authentication needed.
create_payment_request — Create a payment request / checkout pay link (you are the RECEIVER asking to get paid). Price in any of 165 fiat currencies; the payer opens
list_address_book — List the account's saved addresses (label, address, network, direction: Sending = recipients the owner pays, Receiving = the owner's own add
get_draft — Get a payment draft by id, including amounts, fee, quote, and status. Requires scope drafts:read.
get_payment_request — Get a payment request by id: status (Open/Completed/Cancelled/Expired), pay path, offered currencies, and the underlying draft once the paye
get_rate — Get the current exchange rate for an asset in a fiat currency (rate = fiat units per 1 whole asset unit, with source provenance). Assets: Bt
create_draft — Create a non-custodial payment draft (you are the SENDER paying a receiver address). Amount is either exact base units (sats for BTC, micro-
+ 1 more tools once connected
Who runs the send21 MCP server?
The send21 MCP server at a glance
https://send21.io/mcpQuestions, answered
Is there an official send21 MCP server?
Yes — send21 operates its own remote MCP server at send21.io. gate connects you to that official endpoint and adds security scanning, per-tool access rules, and an activity log on top.
How do I connect send21 to Claude or ChatGPT?
Add gate's gateway URL to your AI client once, then pick send21 in the directory. No account or sign-in is needed. From then on, send21's tools are available in every client you've connected to gate.
Do I need to host anything?
No. send21 runs the server, and gate is fully managed. You just connect one URL — there's nothing to install, deploy, or maintain.
Is the send21 MCP server safe to connect?
It's the vendor's official endpoint, and gate scans its tools for prompt injection and hidden instructions before it goes live, re-checks it whenever it changes, and lets you allow, block, or require approval for every single tool.
Is it free?
Yes — you can get started with gate for free and connect send21 in minutes. No credit card required.
Connect more than just send21
Every server below works through the same gateway URL — connect once, add tools anytime.
Squarespace DomainsDesignView →Set up send21 in: Claude · Claude Code · ChatGPT · Cursor · VS Code