Offramps

Prerequisite: Your organization must be approved before it can quote, and the wallet must hold the asset it sells. See KYC Overview for what verification requires, and KYC WebSDK for the hosted flow.

Redemptions do not depend on how much was onramped. A customer can sell any amount of a stablebond up to their current balance. We do not pair buys with sells or track lots, so partial redemptions and tokens bought elsewhere both work.

An offramp moves crypto from a wallet to a bank account. In v2 both sides are payment accounts: you register the wallet and the bank account, quote between them, create the order, and send the crypto. Every call below runs for one organization, set as $ORGANIZATION_ID in the examples. Use your own organization’s id from GET /me, or a customer organization’s id when you ramp for that customer. Register the accounts, quote and order under the same id. See Organizations in the route.

export ORGANIZATION_ID=<organization_id>

Offramp flow

Discover assets

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Either of these endpoints gives you the asset identifiers for a quote:

GET /supported_assets requires auth. It returns every market and token a quote can use. Pass paymentAccountId to see what one of your accounts can use, or chain for one chain.
GET /lookup/stablebonds is public. It returns every stablebond on every chain, with pricing and supply data.

Use a token’s asset from the first, or the identifier from the second, as sourceAsset in the quote.

Asset identifier format differs by chain:

Solana: Base58 mint address (for example AvvetPGuuB5FD5m86fpw3LtDKyQoUFT1mG9WarNQLW4q)
Stellar: CODE:ISSUER (for example CETES:GC3CW7...)
EVM (Base, Polygon, Monad, Avalanche): the raw contract address only (for example 0xcC77c598d42f2f78Beb42C91d12B9d4041a5cE29)

A SYMBOL:0x... identifier on an EVM chain fails.

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Register the wallet that sends the crypto and the bank account that receives the payout. Each call returns the account’s id and its rails. See Register payment account for the full schema.

curl -X POST https://api.sand.etherfuse.com/organization/$ORGANIZATION_ID/payment_account \
  -H "Authorization: <api_key>" \
  -H "Content-Type: application/json" \
  -d '{
    "kind": "wallet",
    "label": "Treasury wallet",
    "accountDetails": {
      "kind": "address",
      "address": "0xf82567432381D1326484E5A9140ABCa4294f82D0",
      "chain": "base"
    }
  }'

curl -X POST https://api.sand.etherfuse.com/organization/$ORGANIZATION_ID/payment_account \
  -H "Authorization: <api_key>" \
  -H "Content-Type: application/json" \
  -d '{
    "kind": "bank",
    "label": "Operating account",
    "country": "MX",
    "currency": "MXN",
    "accountDetails": { "kind": "clabe", "clabe": "012180000000000002" }
  }'

For an offramp, the wallet needs source ready on its chain rail, and the bank account needs destination ready on its fiat rail (spei). Read the account again with GET /organization/{organizationId}/payment_account/{id}, or listen for paymentAccountUpdated.

A bank account route needs holder details such as accountHolderName and taxId. We fill them from the verified identity of the organization in the route, so pass the customer’s organization id to register a customer’s bank account. If a field is still missing, we return 422 registration-info-required with the fields in missing. Send them under registrationInfo and retry.

Create a quote: POST /organization/{organizationId}/quote

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Quote from the wallet to the bank account. Both accounts must belong to the organization in the route. Set sourceAsset to the asset identifier and destinationAsset to the fiat currency. Quotes expire 2 minutes after they are created (expiresAt). See Create quote for the full schema.

curl -X POST https://api.sand.etherfuse.com/organization/$ORGANIZATION_ID/quote \
  -H "Authorization: <api_key>" \
  -H "Content-Type: application/json" \
  -d '{
    "source": { "type": "stored", "id": "<wallet_payment_account_id>" },
    "destination": { "type": "stored", "id": "<bank_payment_account_id>" },
    "sourceAmount": "50",
    "sourceAsset": "0xcC77c598d42f2f78Beb42C91d12B9d4041a5cE29",
    "destinationAsset": "MXN"
  }'

curl -X POST https://api.etherfuse.com/organization/$ORGANIZATION_ID/quote \
  -H "Authorization: <api_key>" \
  -H "Content-Type: application/json" \
  -d '{
    "source": { "type": "stored", "id": "<wallet_payment_account_id>" },
    "destination": { "type": "stored", "id": "<bank_payment_account_id>" },
    "sourceAmount": "50",
    "sourceAsset": "0x834df4C1d8f51Be24322E39e4766697BE015512F",
    "destinationAsset": "MXN"
  }'

Partner fees: We apply your organization’s partner fee automatically. To set it for one quote, add "partnerFeeBpsOverride": 100. We cap values above 500. See Partner fees.

Create the order: POST /organization/{organizationId}/order

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Send the quoteId. The response is 201 with the full order, and the order’s id equals the quoteId. Sending the same quoteId again returns the existing order with 200. See Create order for the full schema.

curl -X POST https://api.sand.etherfuse.com/organization/$ORGANIZATION_ID/order \
  -H "Authorization: <api_key>" \
  -H "Content-Type: application/json" \
  -d '{ "quoteId": "<quote_id>" }'

curl -X POST https://api.etherfuse.com/organization/$ORGANIZATION_ID/order \
  -H "Authorization: <api_key>" \
  -H "Content-Type: application/json" \
  -d '{ "quoteId": "<quote_id>" }'

On an offramp, fundingInstructions.rail is the wallet’s chain, and fundingInstructions.destination says where to send the crypto:

{
  "fundingInstructions": {
    "rail": "stellar",
    "reference": "1000043",
    "destination": {
      "expiresAt": null,
      "address": "GABPM7AXX...",
      "memo": "<memo>",
      "preparedTransaction": {
        "transaction": "AAAAAgAAAABk...base64_xdr...",
        "refreshAfter": "2026-09-28T18:05:02Z"
      }
    },
    "fundingDeadline": "2026-09-28T18:05:02Z"
  }
}

Field	Meaning
`address`	The address to send the crypto to.
`memo`	The memo to include in the transfer. Absent when none is needed.
`preparedTransaction`	A transaction we built for the customer to sign and submit. Absent when there is none.
`preparedTransaction.refreshAfter`	After this time the transaction can no longer land. On Solana it is about 60 seconds after we build it, when the blockhash expires. On Stellar it is the order’s `fundingDeadline`. Null on EVM chains, where the transaction has no time limit. A Stellar or EVM transaction also goes stale when the wallet’s sequence number or nonce moves.

destination is absent until it is available. You receive it in an orderUpdated event, or you can read the order again.

Send the crypto

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Offramps need an on-chain action from the customer. Fund the order before fundingDeadline in one of two ways:

Sign the prepared transaction. When preparedTransaction is present, deserialize transaction, sign it with the customer’s wallet, and submit it to the network.
Send a transfer yourself. Send the order’s source.amount of source.asset to address, with memo when it is present.

Prepared transactions go stale. A Solana transaction goes stale after refreshAfter, when its blockhash expires. A Stellar or EVM transaction goes stale when the wallet sends another transaction first, because its sequence number or nonce moves. In either case, call POST /organization/{organizationId}/order/{id}/funding_instructions/refresh. The new funding instructions arrive a moment later in an orderUpdated webhook and on GET. See Stellar.

Embedded wallets sign through their owner instead. See Embedded Wallets.

Track the order: GET /organization/{organizationId}/order/{id}

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We detect the transfer on-chain and send the fiat payout. The status moves created → funded (crypto received) → completed (fiat sent). Read the order, or subscribe to orderUpdated with POST /webhook_subscription. See Get order for the response schema.

No fiat simulation. Offramps have no fiat_received step. Sending the crypto on the testnet is enough.

curl -H "Authorization: <api_key>" \
  https://api.sand.etherfuse.com/organization/$ORGANIZATION_ID/order/<order_id>

curl -H "Authorization: <api_key>" \
  https://api.etherfuse.com/organization/$ORGANIZATION_ID/order/<order_id>

Show Chain-specific quote examples

The destination is always the bank account. Only the wallet and sourceAsset change.Solana: use the Base58 mint address:

{
  "source": { "type": "stored", "id": "<solana_wallet_payment_account_id>" },
  "destination": { "type": "stored", "id": "<bank_payment_account_id>" },
  "sourceAmount": "50",
  "sourceAsset": "AvvetPGuuB5FD5m86fpw3LtDKyQoUFT1mG9WarNQLW4q",
  "destinationAsset": "MXN"
}

Stellar: use CODE:ISSUER:

{
  "source": { "type": "stored", "id": "<stellar_wallet_payment_account_id>" },
  "destination": { "type": "stored", "id": "<bank_payment_account_id>" },
  "sourceAmount": "50",
  "sourceAsset": "CETES:GC3CW7...",
  "destinationAsset": "MXN"
}

Base, Polygon, Monad or Avalanche: use the raw contract address. This example uses Base; get the address for your chain from GET /supported_assets:

{
  "source": { "type": "stored", "id": "<evm_wallet_payment_account_id>" },
  "destination": { "type": "stored", "id": "<bank_payment_account_id>" },
  "sourceAmount": "50",
  "sourceAsset": "0xcC77c598d42f2f78Beb42C91d12B9d4041a5cE29",
  "destinationAsset": "MXN"
}

Show Which assets each chain supports

Source asset	Chains
Stablebond (for example CETES)	Solana, Stellar, Base, Polygon, Monad, Avalanche
Stablecoin (for example USDC)	Solana, Stellar, Monad

We redeem stablebonds on Solana, so a stablebond offramp from another chain bridges the asset first and can include a bridge fee line.

Show Common errors

Error	Cause	Fix
`409` `organization-not-approved`	Your organization is not approved	Complete verification, then quote again
`409` `payment-account-not-ready`	The wallet is not `ready` as a `source`, or the bank account is not `ready` as a `destination`	Check each account’s `rails` and wait for the direction to become `ready`
`400` `quote-expired`	The quote is older than 2 minutes, or does not exist	Create a new quote
`400` `amount-out-of-range`	The amount is outside a rail’s `minAmount` or `maxAmount`	Change the amount
`422` `quote-unavailable`	We cannot price the route right now	Retry with backoff
Quote rejected for a stablecoin on Base or Polygon	We quote stablecoins only on Solana, Stellar and Monad	Sell a stablebond, or use a wallet on one of those chains
`tx_bad_seq` (Stellar), a nonce error (EVM), or an expired blockhash (Solana)	The prepared transaction went stale before submission	Refresh the funding instructions and sign the new transaction
Stellar transfer fails	The wallet does not hold enough XLM for the network fee	Fund the wallet with XLM. See Stellar

See Errors for every problem type.

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