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"
}
}
LI.FI Intents
Build the Escrow Open Transaction
Turns a quote into an unsigned open call on the LI.FI intents input settler escrow. When the quote carries a quoteId from the RFQ endpoint, the liquidity reservation is re-keyed to the resulting on-chain order id.
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
You can override
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 supplypreview; 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 |
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.inputsmust be on the same origin chain. Mixed origins are rejected with400. - 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 beforefillDeadline, 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
Show child attributes
Show child attributes
Identifier for the liquidity reservation backing this quote. Pass the quote back to /lifi-intents/transaction to keep it.
Unix timestamp after which the quote and its reservation expire.
Estimated fill duration in seconds.
Always sprinter.
Always refund-automatic — an unfilled order is reclaimable on the escrow.
Whether the order may be partially filled. Sprinter quotes are all-or-nothing.
Show child attributes
Show child attributes
Optional overrides for the escrow open call. Any field left unset is derived by the transaction endpoint.
Show child attributes
Show child attributes
Unsigned transaction calling open() on the input settler escrow. Send it from the user's wallet.
Show child attributes
Show child attributes
Response
The same quote with transactionRequest populated
Show child attributes
Show child attributes
Identifier for the liquidity reservation backing this quote. Pass the quote back to /lifi-intents/transaction to keep it.
Unix timestamp after which the quote and its reservation expire.
Estimated fill duration in seconds.
Always sprinter.
Always refund-automatic — an unfilled order is reclaimable on the escrow.
Whether the order may be partially filled. Sprinter quotes are all-or-nothing.
Show child attributes
Show child attributes
Optional overrides for the escrow open call. Any field left unset is derived by the transaction endpoint.
Show child attributes
Show child attributes
Unsigned transaction calling open() on the input settler escrow. Send it from the user's wallet.
Show child attributes
Show child attributes