{"server":"io.github.send21io/mcp","count":11,"tools":[{"name":"create_draft","title":null,"description":"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, lamports for SOL, gwei for ETH) 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.","input_schema":{"type":"object","required":["receiverAddress","network"],"properties":{"memo":{"type":["string","null"],"default":null,"description":"Free-text memo shown on the draft (max 500 chars)"},"network":{"type":"string","description":"Network: Mainnet, Solana, Ethereum, Base, Arbitrum, Polygon (test: Testnet4, Signet, Regtest, SolanaDevnet, EthereumSepolia, BaseSepolia, ArbitrumSepolia, PolygonAmoy)"},"currency":{"type":["string","null"],"default":null,"description":"Asset: Btc (default), Usdc, Usdt, Eurc, Sol (native SOL on Solana), or Eth (native ETH on Ethereum, Base, Arbitrum)"},"fiatAmount":{"type":["number","null"],"default":null,"description":"Fiat amount; requires fiatCurrency"},"fiatCurrency":{"type":["string","null"],"default":null,"description":"Fiat currency code for fiat-pegged amount, e.g. USD"},"idempotencyKey":{"type":["string","null"],"default":null,"description":"Idempotency key. A retry with the same key and the same parameters returns the original draft; the same key with another receiver, amount, currency or network is refused (422) and creates nothing"},"amountBaseUnits":{"type":["integer","null"],"default":null,"description":"Exact amount in base units (sats / micro-units / lamports / gwei); omit when using fiat pricing"},"receiverAddress":{"type":"string","description":"Receiver address (Bitcoin bc1..., Solana base58, or 0x... for Ethereum, Base, Arbitrum and Polygon)"},"shortfallAbsorbUpToPercent":{"type":["number","null"],"default":null,"description":"Accept short payments automatically when they are at most this percent below the amount (0 to 10); the receiver absorbs the difference. Overpayments always wait for a human."}}},"output_schema":null,"annotations":null,"source":"probe","observed_at":"2026-10-19T16:30:07.830Z"},{"name":"create_payment_request","title":null,"description":"Create a payment request / checkout pay link (you are the RECEIVER asking to get paid). Price in any of 161 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.","input_schema":{"type":"object","required":["fiatCurrency","fiatAmount","options"],"properties":{"memo":{"type":["string","null"],"default":null,"description":"Message shown to the payer (max 500 chars)"},"options":{"type":"array","items":{"type":"object","required":["currency","network","address"],"properties":{"method":{"type":["string","null"],"default":null,"description":"MultiOutput (on-chain, default) or Lightning (Btc on Mainnet; send21 confirms it when the receiver's provider supports LUD-21)"},"address":{"type":"string","description":"The RECEIVER's own address for this currency; for Lightning, the receiver's Lightning address (name@wallet.com)"},"network":{"type":"string","description":"Network the address lives on: Mainnet, Solana, Ethereum, Base, Arbitrum, or Polygon"},"currency":{"type":"string","description":"Asset: Btc, Usdc, Usdt, Eurc, Sol, or Eth"}}},"description":"Currencies the payer may choose from, each with your receiving address"},"orderId":{"type":["string","null"],"default":null,"description":"Your own order/reference id, echoed in webhooks for reconciliation"},"fiatAmount":{"type":"number","description":"Amount in the fiat currency"},"declineNote":{"type":["string","null"],"default":null,"description":"What happens if the payer does not pay (plain text, max 200 chars). Shown on the pay page under the amount as \"If you don't pay:\". Use it when handing an over-budget purchase to a human, e.g. \"The order is cancelled and the hotel room released at 18:00.\""},"expiryHours":{"type":["integer","null"],"default":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"],"default":null,"description":"Idempotency key. A retry with the same key and the same parameters returns the original request; the same key with another amount, currency or address is refused (422) and creates nothing"},"reuseOpenForOrder":{"type":["boolean","null"],"default":null,"description":"True: if an open, unexpired request with the same orderId exists, return it instead of creating a second pay link for the same order (only when it asks for the same amount, currency and addresses). Recommended for agents that may retry with a new idempotency key."},"shortfallAbsorbUpToPercent":{"type":["number","null"],"default":null,"description":"Accept short payments automatically when they are at most this percent below the price (0 to 10); the receiver absorbs the difference. Overpayments always wait for a human. Omit to have every differing amount reviewed."}}},"output_schema":null,"annotations":null,"source":"probe","observed_at":"2026-10-19T16:30:07.830Z"},{"name":"get_draft","title":null,"description":"Get a payment draft by id, including amounts, fee, quote, and status. Requires scope drafts:read.","input_schema":{"type":"object","required":["draftId"],"properties":{"draftId":{"type":"string","description":"Draft id (GUID)"}}},"output_schema":null,"annotations":null,"source":"probe","observed_at":"2026-10-19T16:30:07.830Z"},{"name":"get_draft_status","title":null,"description":"Lightweight status snapshot of a draft: status (AwaitingPayment/Seen/Confirmed/Expired/Cancelled), paying txid, confirmations, and reviewState when a transfer with a different amount arrived (pending = needs the receiver's decision and the draft is not paid; accepted; rejected; unresolved = the draft expired while undecided, the money is with the receiver). Cheap to poll. Requires scope drafts:read.","input_schema":{"type":"object","required":["draftId"],"properties":{"draftId":{"type":"string","description":"Draft id (GUID)"}}},"output_schema":null,"annotations":null,"source":"probe","observed_at":"2026-10-19T16:30:07.830Z"},{"name":"get_fee_schedule","title":null,"description":"Get the public send21 fee schedule: tiered percent by payment size in USD, min/max fee, and dust limit. No authentication needed.","input_schema":{"type":"object","properties":{}},"output_schema":null,"annotations":null,"source":"probe","observed_at":"2026-10-19T16:30:07.830Z"},{"name":"get_payment_request","title":null,"description":"Get a payment request by id: status (Open/Completed/Cancelled/Expired), pay path, offered currencies, and the underlying draft once the payer committed. Includes changeSignals and changeNotes: what is unusual compared with the account's paid payments (new_address, new_asset, unusual_amount), the same lines the payer sees on the pay page; empty when nothing is unusual. Requires scope drafts:read.","input_schema":{"type":"object","required":["paymentRequestId"],"properties":{"paymentRequestId":{"type":"string","description":"Payment request id (GUID)"}}},"output_schema":null,"annotations":null,"source":"probe","observed_at":"2026-10-19T16:30:07.830Z"},{"name":"get_rate","title":null,"description":"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, Sol, Eth. 161 ISO 4217 fiat currencies are supported. Requires an API key.","input_schema":{"type":"object","required":["fiatCurrency","asset"],"properties":{"asset":{"type":"string","description":"Asset: Btc, Usdc, Usdt, Eurc, Sol, or Eth"},"fiatCurrency":{"type":"string","description":"Fiat currency code, e.g. USD, EUR, SEK"}}},"output_schema":null,"annotations":null,"source":"probe","observed_at":"2026-10-19T16:30:07.830Z"},{"name":"get_transaction_template","title":null,"description":"Get the transaction template for an on-chain draft: every output to pay, plus walletcreatefundedpsbt arguments and a pay-to-many CSV on Bitcoin, or payment URIs (and calldata on EVM chains) on Solana, Ethereum, Base, Arbitrum and Polygon. The sender's own wallet funds, reviews and signs it; send21 contains no signing code. Not for Lightning drafts (pay their invoice). Requires scope drafts:read.","input_schema":{"type":"object","required":["draftId"],"properties":{"draftId":{"type":"string","description":"Draft id (GUID)"}}},"output_schema":null,"annotations":null,"source":"probe","observed_at":"2026-10-19T16:30:07.830Z"},{"name":"list_address_book","title":null,"description":"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.","input_schema":{"type":"object","properties":{}},"output_schema":null,"annotations":null,"source":"probe","observed_at":"2026-10-19T16:30:07.830Z"},{"name":"list_draft_quotes","title":null,"description":"List every quote (rate lock) of a fiat-priced draft, oldest first. Quotes never change; a re-quote adds a new one with its own id. Each has a sha256 (RFC 8785 JCS + SHA-256). Requires scope drafts:read.","input_schema":{"type":"object","required":["draftId"],"properties":{"draftId":{"type":"string","description":"Draft id (GUID)"}}},"output_schema":null,"annotations":null,"source":"probe","observed_at":"2026-10-19T16:30:07.830Z"},{"name":"submit_lightning_proof","title":null,"description":"Confirm a paid Lightning draft with its proof of payment: the 64-character preimage the paying wallet shows after a Lightning payment. Needed for drafts with a pasted bolt11 invoice, and for Lightning addresses whose provider does not report payments. send21 checks that SHA-256 of the preimage equals the invoice's payment hash; the draft then confirms within about 30 seconds. Requires scope drafts:write.","input_schema":{"type":"object","required":["draftId","preimage"],"properties":{"draftId":{"type":"string","description":"Draft id (GUID)"},"preimage":{"type":"string","description":"Payment preimage, 64 hex characters"}}},"output_schema":null,"annotations":null,"source":"probe","observed_at":"2026-10-19T16:30:07.830Z"}],"next_cursor":null,"next_actions":[{"action":"get_connection","description":"Connection block to call these tools","href":"/v1/servers/io.github.send21io%2Fmcp/connection?target=mcpServers","arguments":{"name":"io.github.send21io/mcp","target":"mcpServers"}},{"action":"get_server","description":"Full descriptor with trust and connectability","href":"/v1/servers/io.github.send21io%2Fmcp","arguments":{"name":"io.github.send21io/mcp"}}]}