Build the Escrow Open Transaction

curl --request POST \
  --url 'https://api.sprinter.tech/lifi-intents/transaction' \
  --header 'Content-Type: application/json' \
  --data @quote.json

import requests

# `quote` is quotes[0] from the RFQ response, passed through unchanged
response = requests.post(
    "https://api.sprinter.tech/lifi-intents/transaction",
    json=quote,
)
tx = response.json()["transactionRequest"]

// `quote` is quotes[0] from the RFQ response, passed through unchanged
const response = await fetch(
  "https://api.sprinter.tech/lifi-intents/transaction",
  {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(quote),
  }
);
const { transactionRequest } = await response.json();

// send it from the user's wallet
const hash = await walletClient.sendTransaction({
  to: transactionRequest.to,
  data: transactionRequest.data,
  value: BigInt(transactionRequest.value),
  chainId: transactionRequest.chainId,
});

package main

import (
	"bytes"
	"fmt"
	"io"
	"net/http"
)

func main() {
	// quoteJSON is quotes[0] from the RFQ response, passed through unchanged
	resp, _ := http.Post(
		"https://api.sprinter.tech/lifi-intents/transaction",
		"application/json",
		bytes.NewReader(quoteJSON),
	)
	defer resp.Body.Close()
	body, _ := io.ReadAll(resp.Body)
	fmt.Println(string(body))
}

{
  "validUntil": 1754481615,
  "eta": 45,
  "quoteId": "3f8a1c72-95e4-4d6b-b0a1-2c7e9f4d8a13",
  "provider": "sprinter",
  "preview": {
    "inputs": [
      {
        "user": "0x00010000022105141f98431c8ad98523631ae4a59f267346ea31f984",
        "asset": "0x0001000002210514833589fcd6edb6e08f4c7c32d4f71b54bda02913",
        "amount": "100000000"
      }
    ],
    "outputs": [
      {
        "receiver": "0x0001000002a4b1141f98431c8ad98523631ae4a59f267346ea31f984",
        "asset": "0x0001000002a4b114af88d065e77c8cc2239327c5edb3a432268e5831",
        "amount": "99850000"
      }
    ]
  },
  "metadata": {
    "exclusiveFor": "0x4c4A2f8c81640e47606d3fd77B353E87Ba015584"
  },
  "failureHandling": "refund-automatic",
  "transactionRequest": {
    "from": "0x1F98431c8aD98523631AE4a59f267346ea31F984",
    "to": "0x6E9a1b3F0c5D2a8B4e7C1f9A3d6B0e5C8f2A4d71",
    "chainId": 8453,
    "data": "0xff2b0c2b0000000000000000000000000000000000000000000000000000000000000020",
    "value": "0x0"
  }
}

POST

lifi-intents

transaction

curl --request POST \
  --url 'https://api.sprinter.tech/lifi-intents/transaction' \
  --header 'Content-Type: application/json' \
  --data @quote.json

import requests

# `quote` is quotes[0] from the RFQ response, passed through unchanged
response = requests.post(
    "https://api.sprinter.tech/lifi-intents/transaction",
    json=quote,
)
tx = response.json()["transactionRequest"]

// `quote` is quotes[0] from the RFQ response, passed through unchanged
const response = await fetch(
  "https://api.sprinter.tech/lifi-intents/transaction",
  {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(quote),
  }
);
const { transactionRequest } = await response.json();

// send it from the user's wallet
const hash = await walletClient.sendTransaction({
  to: transactionRequest.to,
  data: transactionRequest.data,
  value: BigInt(transactionRequest.value),
  chainId: transactionRequest.chainId,
});

package main

import (
	"bytes"
	"fmt"
	"io"
	"net/http"
)

func main() {
	// quoteJSON is quotes[0] from the RFQ response, passed through unchanged
	resp, _ := http.Post(
		"https://api.sprinter.tech/lifi-intents/transaction",
		"application/json",
		bytes.NewReader(quoteJSON),
	)
	defer resp.Body.Close()
	body, _ := io.ReadAll(resp.Body)
	fmt.Println(string(body))
}

{
  "validUntil": 1754481615,
  "eta": 45,
  "quoteId": "3f8a1c72-95e4-4d6b-b0a1-2c7e9f4d8a13",
  "provider": "sprinter",
  "preview": {
    "inputs": [
      {
        "user": "0x00010000022105141f98431c8ad98523631ae4a59f267346ea31f984",
        "asset": "0x0001000002210514833589fcd6edb6e08f4c7c32d4f71b54bda02913",
        "amount": "100000000"
      }
    ],
    "outputs": [
      {
        "receiver": "0x0001000002a4b1141f98431c8ad98523631ae4a59f267346ea31f984",
        "asset": "0x0001000002a4b114af88d065e77c8cc2239327c5edb3a432268e5831",
        "amount": "99850000"
      }
    ]
  },
  "metadata": {
    "exclusiveFor": "0x4c4A2f8c81640e47606d3fd77B353E87Ba015584"
  },
  "failureHandling": "refund-automatic",
  "transactionRequest": {
    "from": "0x1F98431c8aD98523631AE4a59f267346ea31F984",
    "to": "0x6E9a1b3F0c5D2a8B4e7C1f9A3d6B0e5C8f2A4d71",
    "chainId": 8453,
    "data": "0xff2b0c2b0000000000000000000000000000000000000000000000000000000000000020",
    "value": "0x0"
  }
}

Turns a quote into an unsigned open call on the LI.FI input settler escrow. POST the quote object you received from GET /lifi-intents/rfq; you get the same object back with transactionRequest populated. Sending that transaction escrows the inputs on the origin chain and broadcasts the order to solvers.

Include the quoteId from the RFQ response. Without it the endpoint still returns valid calldata, but no liquidity is reserved and the order is not guaranteed a Sprinter fill — you get no error saying so.

Reservation window

Converting a quote refreshes its reservation to 60 seconds, counted from this call — not from the RFQ. That is the window you have to get the transaction signed and on-chain.


Held for	60 seconds from the `/transaction` response
Applies when	The posted quote carries a `quoteId`. The 15-second RFQ reservation is extended to the full 60 seconds and re-keyed from the quote id to the on-chain order id
Without a `quoteId`	Nothing is reserved and nothing is refreshed
After it lapses	The liquidity is released back to the pool. The calldata stays valid and the order is still fillable, but no longer guaranteed a Sprinter fill

Reservations come out of a pool shared with other solvers, so liquidity held against your quote is liquidity nobody else can be quoted. Each conversion holds its full amount for 60 seconds — four times the RFQ window — and the hold is not released early if you never send the transaction. Test this endpoint with small amounts: a loop over real quote sizes can take a meaningful share of a pool out of circulation a minute at a time.

What the endpoint fills in

You supply preview; everything else is derived:

Field	Derived as
`nonce`	Generated per request
`fillDeadline`	~6 minutes out — 1 minute exclusive to Sprinter, then 5 minutes open to any solver
`expires`	`fillDeadline` + a settlement buffer: ~13 minutes for same-chain orders, ~12 hours for cross-chain
`inputOracle` / output oracle	From Sprinter’s configuration
Exclusivity	Encoded per output; defaults to Sprinter’s filler address
`value`	Sum of native-token inputs, hex encoded. `0x0` for ERC-20-only orders

You can override nonce, expires, fillDeadline and inputOracle by setting them in the order object on the request, and override the exclusive filler with metadata.exclusiveFor. Leave them unset unless you have a specific reason — the defaults are what the reservation is priced against.

Constraints

Every entry in preview.inputs must be on the same origin chain. Mixed origins are rejected with 400.
The returned transaction must be sent by transactionRequest.from — the payer named in the first input.
Send it promptly — the reservation lapses 60 seconds after this call. See Reservation window.

curl --request POST \
  --url 'https://api.sprinter.tech/lifi-intents/transaction' \
  --header 'Content-Type: application/json' \
  --data @quote.json

import requests

# `quote` is quotes[0] from the RFQ response, passed through unchanged
response = requests.post(
    "https://api.sprinter.tech/lifi-intents/transaction",
    json=quote,
)
tx = response.json()["transactionRequest"]

// `quote` is quotes[0] from the RFQ response, passed through unchanged
const response = await fetch(
  "https://api.sprinter.tech/lifi-intents/transaction",
  {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(quote),
  }
);
const { transactionRequest } = await response.json();

// send it from the user's wallet
const hash = await walletClient.sendTransaction({
  to: transactionRequest.to,
  data: transactionRequest.data,
  value: BigInt(transactionRequest.value),
  chainId: transactionRequest.chainId,
});

package main

import (
	"bytes"
	"fmt"
	"io"
	"net/http"
)

func main() {
	// quoteJSON is quotes[0] from the RFQ response, passed through unchanged
	resp, _ := http.Post(
		"https://api.sprinter.tech/lifi-intents/transaction",
		"application/json",
		bytes.NewReader(quoteJSON),
	)
	defer resp.Body.Close()
	body, _ := io.ReadAll(resp.Body)
	fmt.Println(string(body))
}

{
  "validUntil": 1754481615,
  "eta": 45,
  "quoteId": "3f8a1c72-95e4-4d6b-b0a1-2c7e9f4d8a13",
  "provider": "sprinter",
  "preview": {
    "inputs": [
      {
        "user": "0x00010000022105141f98431c8ad98523631ae4a59f267346ea31f984",
        "asset": "0x0001000002210514833589fcd6edb6e08f4c7c32d4f71b54bda02913",
        "amount": "100000000"
      }
    ],
    "outputs": [
      {
        "receiver": "0x0001000002a4b1141f98431c8ad98523631ae4a59f267346ea31f984",
        "asset": "0x0001000002a4b114af88d065e77c8cc2239327c5edb3a432268e5831",
        "amount": "99850000"
      }
    ]
  },
  "metadata": {
    "exclusiveFor": "0x4c4A2f8c81640e47606d3fd77B353E87Ba015584"
  },
  "failureHandling": "refund-automatic",
  "transactionRequest": {
    "from": "0x1F98431c8aD98523631AE4a59f267346ea31F984",
    "to": "0x6E9a1b3F0c5D2a8B4e7C1f9A3d6B0e5C8f2A4d71",
    "chainId": 8453,
    "data": "0xff2b0c2b0000000000000000000000000000000000000000000000000000000000000020",
    "value": "0x0"
  }
}

After the fill

Sprinter fills on the destination chain within the exclusivity window and is repaid when the escrow settles. If nobody fills before fillDeadline, the order is reclaimable on the escrow contract — failureHandling is refund-automatic, so nothing is stranded.

Body

application/json

A quote from the RFQ response

preview

object

required

Show child attributes

quoteId

string

Identifier for the liquidity reservation backing this quote. Pass the quote back to /lifi-intents/transaction to keep it.

validUntil

integer

Unix timestamp after which the quote and its reservation expire.

eta

integer

Estimated fill duration in seconds.

provider

string

Always sprinter.

failureHandling

string

Always refund-automatic — an unfilled order is reclaimable on the escrow.

partialFill

boolean

Whether the order may be partially filled. Sprinter quotes are all-or-nothing.

metadata

object

Show child attributes

order

object

Optional overrides for the escrow open call. Any field left unset is derived by the transaction endpoint.

Show child attributes

transactionRequest

object

Unsigned transaction calling open() on the input settler escrow. Send it from the user's wallet.

Show child attributes

Response

The same quote with transactionRequest populated

preview

object

required

Show child attributes

quoteId

string

Identifier for the liquidity reservation backing this quote. Pass the quote back to /lifi-intents/transaction to keep it.

validUntil

integer

Unix timestamp after which the quote and its reservation expire.

eta

integer

Estimated fill duration in seconds.

provider

string

Always sprinter.

failureHandling

string

Always refund-automatic — an unfilled order is reclaimable on the escrow.

partialFill

boolean

Whether the order may be partially filled. Sprinter quotes are all-or-nothing.

metadata

object

Show child attributes

order

object

Optional overrides for the escrow open call. Any field left unset is derived by the transaction endpoint.

Show child attributes

transactionRequest

object

Unsigned transaction calling open() on the input settler escrow. Send it from the user's wallet.

Show child attributes

Credit

Liquidity

Solve RFQ

Reservation window

What the endpoint fills in

Constraints

After the fill

Body

Response

​Reservation window

​What the endpoint fills in

​Constraints

​After the fill

Body

Response

Reservation window

What the endpoint fills in

Constraints

After the fill