Prepare to accept an offer

POST/api/market/offers/{id}/accept/prepare

Step 1 of accepting, for the UTXO's current holder only: checks the offer is active and the UTXO unspent at the same address and value, and returns the offer transaction with input 0 (your UTXO) ready for your wallet. It carries no bidder signature.

Path parameters #

Parameter	Type	Required	Description
`id`	string	yes	The offer id (16 hex characters).

Request body #

content-type: application/json

Field	Type	Required	Description
`seller_address`	string	yes	The address that holds the UTXO (the offer's `seller_address`).
`seller_public_key`	string	yes	Its public key, hex (Taproot: the internal key, x-only or compressed; SegWit: compressed).

Example request #

cURL

curl -X POST 'https://raresats.net/api/market/offers/dbf866a1e7e209e7/accept/prepare' \
  -H 'content-type: application/json' \
  -d '{
  "seller_address": "bc1p5cyxnuxmeuwuvkwfem96lqzszd02n6xdcjrs20cac6yqjjwudpxqkedrcr",
  "seller_public_key": "03cc8a4bc64d897bddc5fbc2f670f7a8ba0b386779106cf1223c6fc5d7cd6fc115"
}'

JavaScript

const response = await fetch('https://raresats.net/api/market/offers/dbf866a1e7e209e7/accept/prepare', {
  method: 'POST',
  headers: { 'content-type': 'application/json' },
  body: JSON.stringify({
    "seller_address": "bc1p5cyxnuxmeuwuvkwfem96lqzszd02n6xdcjrs20cac6yqjjwudpxqkedrcr",
    "seller_public_key": "03cc8a4bc64d897bddc5fbc2f670f7a8ba0b386779106cf1223c6fc5d7cd6fc115"
  })
});
const data = await response.json();

Python

import requests

data = requests.post("https://raresats.net/api/market/offers/dbf866a1e7e209e7/accept/prepare", json={
    "seller_address": "bc1p5cyxnuxmeuwuvkwfem96lqzszd02n6xdcjrs20cac6yqjjwudpxqkedrcr",
    "seller_public_key": "03cc8a4bc64d897bddc5fbc2f670f7a8ba0b386779106cf1223c6fc5d7cd6fc115"
}).json()

Response `200` #

Field	Type	Description
`psbt`	string	The offer transaction, base64, with input 0 ready for your wallet. It carries no bidder signature (the server adds them).
`sign`	array of object	Input 0, your UTXO: sign it with your wallet's default sighash.
`sign[].index`	integer	The input to sign.
`sign[].address`	string	The address whose key signs it.
`sign[].sighash`	integer	The sighash type to sign with, when it is not the default: 131 (`0x83`, SIGHASH_SINGLE\|ANYONECANPAY) for listings. Absent on purchase inputs: sign with the default (SIGHASH_DEFAULT for Taproot, SIGHASH_ALL for SegWit v0).
`summary`	object	The trade you accept.
`summary.outpoint`	string	Your UTXO.
`summary.value`	integer	Its value in sats (it goes to the bidder).
`summary.price`	integer	What you receive, in sats (output 1, to your address).
`summary.platform_fee`	integer	The bidder's platform fee.
`summary.network_fee`	integer	The network fee, paid by the bidder.
`summary.total`	integer	What the bidder pays.
`summary.vsize`	integer	Estimated virtual size.
`summary.fee_rate`	number	sat/vB, fixed by the bidder. If it confirms slowly, you can speed it up by spending output 1 (CPFP).
`summary.unit_price`	number	`(price - value) / count`.
`summary.row`	string	The UTXO's own row.
`summary.count`	integer	Sats of `row` in the UTXO.
`summary.bidder_ordinals_address`	string	Where the UTXO goes.
`summary.listing_id`	string \| null	Your live listing of the UTXO, if any: accepting sells it (`sold` once confirmed).

Response

{
  "psbt": "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",
  "sign": [
    {
      "index": 0,
      "address": "bc1p5cyxnuxmeuwuvkwfem96lqzszd02n6xdcjrs20cac6yqjjwudpxqkedrcr"
    }
  ],
  "summary": {
    "outpoint": "24b3eedfdc210f4a5baa96a6c99db5a51d3b1286ab2f58cb0b16fc607e54107f:0",
    "value": 10000,
    "price": 110000,
    "platform_fee": 2750,
    "network_fee": 963,
    "total": 113713,
    "vsize": 321,
    "fee_rate": 3,
    "unit_price": 100000,
    "row": "decasat_alpha",
    "count": 1,
    "bidder_ordinals_address": "bc1p4qhjn9zdvkux4e44uhx8tc55attvtyu358kutcqkudyccelu0was9fqzwh",
    "listing_id": "5e1cb930f43354c3"
  }
}

Errors #

{error, code}; see Errors for every code.

Status	Code	Meaning
400	`bad_address`	An address is not a mainnet address (or not one at all).
400	`bad_json`	The body is not valid JSON.
400	`bad_public_key`	A public key is not hex, or not a valid secp256k1 key of the right size.
400	`bad_request`	The body is not a JSON object, or the engine refused a malformed request (e.g. a purchase submitted without its signed setup PSBT).
403	`cross_origin`	A POST from a browser on another site (a foreign `Origin`, or `sec-fetch-site: cross-site`). Server-side clients send no `Origin` and are not affected.
404	`not_found`	No such listing or offer. In chat: no such message. A display name to remove that does not exist.
405	`method_not_allowed`	Wrong method for the route; the `allow` header lists the right ones.
409	`changed`	The UTXO's value is not what the PSBT says, or (wallet tools) a UTXO, its sats or the transaction being replaced changed since prepare: prepare again.
409	`config_changed`	The marketplace settings changed since this purchase or transfer was prepared (prepare it again), or since this offer was made (it is now `invalid`, reason `config_changed`).
409	`expired`	The prepared purchase, offer or transfer expired, or the offer itself has: prepare it again.
409	`not_active`	A listing (or offer) is not active: being bought (or accepted), sold, cancelled, moved, expired or invalid. Carries `id` and `status`.
409	`spent`	The UTXO (or a listing's UTXO) is spent or does not exist.
413	`too_large`	The body is over 256 KiB.
415	`not_json`	A POST without `content-type: application/json`.
422	`key_mismatch`	The public key does not control the address.
422	`legacy_address`	A legacy (P2PKH, `1…`) address: use Taproot or SegWit.
422	`not_owner`	The UTXO does not belong to the seller address, or (wallet tools) to the owner's addresses, or the transfer was made by another wallet.
422	`pubkey_mismatch`	The trade engine found the public key is not the address's key.
422	`unsupported_address`	An address type the marketplace does not trade (only Taproot, native SegWit and nested SegWit).
422	`unsupported_script`	The trade engine met a script type it does not support.
429	`rate_limited`	Over 30 POSTs a minute from your IPv4 address or IPv6 /64 (in chat, counted per IPv4 address or IPv6 /64: 30 writes and 20 login nonces a minute, 20 sign-ins and 10 display-name changes an hour; one message every 3 s and 20 a minute per address); wait `retry-after` seconds. With the AI moderation on, at most 6 messages and names a minute are checked per address and per IPv4 address or IPv6 /48.
500	`internal`	A server bug. Report it.
503	`bitcoind_unavailable`	bitcoind is not available.
503	`engine_unavailable`	The trade engine is not available.
503	`fork_unavailable`	The rare-sat index is not available.
503	`market_unavailable`	The marketplace is closed right now (its backends disagree on the network, or are unreachable).
503	`oracle_unavailable`	The ord oracle is not available.

Error (422)

{
  "error": "24b3eedfdc210f4a5baa96a6c99db5a51d3b1286ab2f58cb0b16fc607e54107f:0 is not held by bc1p4qhjn9zdvkux4e44uhx8tc55attvtyu358kutcqkudyccelu0was9fqzwh: only its holder can accept",
  "code": "not_owner",
  "outpoint": "24b3eedfdc210f4a5baa96a6c99db5a51d3b1286ab2f58cb0b16fc607e54107f:0"
}

Then sign input 0 with your wallet's default sighash and accept. You receive price at the address that holds the UTXO (output 1); the bidder pays the platform fee and the network fee.