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send21

io.github.send21io/mcp
Krypto & Web3 Payments & Fintech Öffentlich und erreichbar MCP 2025-11-25

Was dieses MCP kann

Creates non-custodial payment drafts and pay links for Bitcoin and stablecoins, with exchange rates, transaction templates, fees, and payment status tracking.

Funktionen

Tools

9 Tools
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-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.
Eingabeschema 
{'type': 'object', 'required': ['receiverAddress', 'network', 'currency', 'amountBaseUnits', 'fiatCurrency', 'fiatAmount', 'memo', 'idempotencyKey'], 'properties': {'memo': {'type': ['string', 'null'], 'description': 'Free-text memo shown on the draft (max 500 chars)'}, 'network': {'type': 'string', 'description': 'Network: Mainnet, Solana, Ethereum, Base (test: Testnet4, Signet, Regtest, SolanaDevnet, EthereumSepolia, BaseSepolia)'}, 'currency': {'type': ['string', 'null'], 'description': 'Asset: Btc (default), Usdc, Usdt, or Eurc'}, 'fiatAmount': {'type': ['number', 'null'], 'description': 'Fiat amount; requires fiatCurrency'}, 'fiatCurrency': {'type': ['string', 'null'], 'description': 'Fiat currency code for fiat-pegged amount, e.g. USD'}, 'idempotencyKey': {'type': ['string', 'null'], 'description': 'Idempotency key — retries with the same key return the original draft'}, 'amountBaseUnits': {'type': ['integer', 'null'], 'description': 'Exact amount in base units (sats / micro-units); omit when using fiat pricing'}, 'receiverAddress': {'type': 'string', 'description': 'Receiver address (Bitcoin bc1…, Solana base58, or 0x… for Ethereum/Base)'}}}
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 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.
Eingabeschema 
{'type': 'object', 'required': ['fiatCurrency', 'fiatAmount', 'options', 'orderId', 'memo', 'expiryHours', 'idempotencyKey'], 'properties': {'memo': {'type': ['string', 'null'], 'description': 'Message shown to the payer (max 500 chars)'}, 'options': {'type': 'array', 'items': {'type': 'object', 'required': ['currency', 'network', 'address'], 'properties': {'address': {'type': 'string', 'description': "The RECEIVER's own address for this currency"}, 'network': {'type': 'string', 'description': 'Network the address lives on: Mainnet, Solana, Ethereum, or Base'}, 'currency': {'type': 'string', 'description': 'Asset: Btc, Usdc, Usdt, or Eurc'}}}, 'description': 'Currencies the payer may choose from, each with your receiving address'}, 'orderId': {'type': ['string', 'null'], 'description': 'Your own order/reference id — echoed in webhooks for reconciliation'}, 'fiatAmount': {'type': 'number', 'description': 'Amount in the fiat currency'}, 'expiryHours': {'type': ['integer', 'null'], 'description': 'Hours until the request expires (default 24)'}, 'fiatCurrency': {'type': 'string', 'description': 'Fiat currency the request is priced in, e.g. USD, EUR, SEK'}, 'idempotencyKey': {'type': ['string', 'null'], 'description': 'Idempotency key — retries with the same key return the original request'}}}
get_draft
Get a payment draft by id, including amounts, fee, quote, and status. Requires scope drafts:read.
Eingabeschema 
{'type': 'object', 'required': ['draftId'], 'properties': {'draftId': {'type': 'string', 'description': 'Draft id (GUID)'}}}
get_draft_status
Lightweight status snapshot of a draft: status (AwaitingPayment/Seen/Confirmed/Expired/Cancelled), paying txid, confirmations. Cheap to poll. Requires scope drafts:read.
Eingabeschema 
{'type': 'object', 'required': ['draftId'], 'properties': {'draftId': {'type': 'string', 'description': 'Draft id (GUID)'}}}
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.
Eingabeschema 
{'type': 'object', 'properties': {}}
get_payment_request
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.
Eingabeschema 
{'type': 'object', 'required': ['paymentRequestId'], 'properties': {'paymentRequestId': {'type': 'string', 'description': 'Payment request id (GUID)'}}}
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: Btc, Usdc, Usdt, Eurc. 165 ISO-4217 fiat currencies are supported.
Eingabeschema 
{'type': 'object', 'required': ['fiatCurrency', 'asset'], 'properties': {'asset': {'type': 'string', 'description': 'Asset: Btc, Usdc, Usdt, or Eurc'}, 'fiatCurrency': {'type': 'string', 'description': 'Fiat currency code, e.g. USD, EUR, SEK'}}}
get_transaction_template
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.
Eingabeschema 
{'type': 'object', 'required': ['draftId'], 'properties': {'draftId': {'type': 'string', 'description': 'Draft id (GUID)'}}}
list_address_book
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.
Eingabeschema 
{'type': 'object', 'properties': {}}
Verlauf

Letzte Tool-Änderungen

Hinzugefügt
get_draft_status
17. September 2026 12:52
Hinzugefügt
create_draft
17. September 2026 12:52
Hinzugefügt
get_rate
17. September 2026 12:52
Hinzugefügt
get_payment_request
17. September 2026 12:52
Hinzugefügt
get_draft
17. September 2026 12:52
Hinzugefügt
list_address_book
17. September 2026 12:52
Hinzugefügt
create_payment_request
17. September 2026 12:52
Hinzugefügt
get_fee_schedule
17. September 2026 12:52
Hinzugefügt
get_transaction_template
17. September 2026 12:52
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