send21 MCP server

• create_draftwrite actionFree

  Create a non-custodial payment draft (you are the SENDER paying a receiver address). Amount is either exact base units (sats for BTC, micro-units for stablecoins) via amountBaseUnits, or fiat-pegged via fiatCurrency+fiatAmount with the exchange rate locked at creation. Returns the draft incl. id, amounts, fee, and status. Funds move only when the sender signs in their own wallet — send21 never holds keys. Requires scope drafts:write.

• create_payment_requestwrite actionFree

  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 the returned payPath, picks one of the offered currencies (rate locks then), and pays a single QR-scannable transfer straight to your address. Requires scope drafts:write.

• get_draftFree

  Get a payment draft by id, including amounts, fee, quote, and status. Requires scope drafts:read.

• get_draft_statusFree

  Lightweight status snapshot of a draft: status (AwaitingPayment/Seen/Confirmed/Expired/Cancelled), paying txid, confirmations. Cheap to poll. Requires scope drafts:read.

• get_fee_scheduleFree

  Get the public send21 fee schedule: tiered percent by payment size in USD, min/max fee, and dust limit. No authentication needed.

• get_payment_requestFree

  Get a payment request by id: status (Open/Completed/Cancelled/Expired), pay path, offered currencies, and the underlying draft once the payer committed. Requires scope drafts:read.

• get_rateFree

  Get the current exchange rate for an asset in a fiat currency (rate = fiat units per 1 whole asset unit, with source provenance). Assets: Btc, Usdc, Usdt, Eurc. 165 ISO-4217 fiat currencies are supported.

• get_transaction_templateFree

  Get the multi-output transaction template for a draft: Bitcoin Core walletcreatefundedpsbt arguments and Electrum/Sparrow pay-to-many CSV. The operator's wallet funds, reviews, and signs it — send21 contains no signing code. Requires scope drafts:read.

• list_address_bookFree

  List the account's saved addresses (label, address, network, direction: Sending = recipients the owner pays, Receiving = the owner's own addresses). Requires scope addressbook:read.

• –Code scanremote-only server, no package to scann/a
• Live reliabilityremote reachable in 930ms20/20
• Tool poisoning9 tool descriptions checked15/15
• Auth qualityopen endpoint exposes 2 write-action tools with no auth3/15
• Maintenancelast push 14 days ago15/15
• Maintainer identityregistry namespace matches repository owner6/10

send21: common questions

Is send21 MCP server safe?

Mostly: it is graded B (79/100). Read the send21 safety report

How do I install send21?

It runs remotely at send21.io. Add it to Claude Code, Claude Desktop or Cursor with the snippets above, or call it through the mcp.market gateway without installing anything.

Does send21 need an API key?

Not as far as the registry entry and our scan can tell: no credentials are declared or required.

Is send21 maintained?

The last commit was 14 days ago (2026-09-06). The latest release is v1.0.0.

Is send21 up?

100% of our last 2 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: Agent402.Tools: pay-per-call web tools MCP server, IronWallet MCP server and Easypaydirect MCP server. Compare all send21 alternatives.