Submit signed transaction
curl --request POST \
--url https://api-partner.houdiniswap.com/v2/exchanges/multi/{multiId}/tx \
--header 'Authorization: <api-key>' \
--header 'Content-Type: application/json' \
--data '
{
"signatures": [
"<string>"
]
}
'import requests
url = "https://api-partner.houdiniswap.com/v2/exchanges/multi/{multiId}/tx"
payload = { "signatures": ["<string>"] }
headers = {
"Authorization": "<api-key>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {Authorization: '<api-key>', 'Content-Type': 'application/json'},
body: JSON.stringify({signatures: ['<string>']})
};
fetch('https://api-partner.houdiniswap.com/v2/exchanges/multi/{multiId}/tx', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://api-partner.houdiniswap.com/v2/exchanges/multi/{multiId}/tx",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'signatures' => [
'<string>'
]
]),
CURLOPT_HTTPHEADER => [
"Authorization: <api-key>",
"Content-Type: application/json"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://api-partner.houdiniswap.com/v2/exchanges/multi/{multiId}/tx"
payload := strings.NewReader("{\n \"signatures\": [\n \"<string>\"\n ]\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Authorization", "<api-key>")
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://api-partner.houdiniswap.com/v2/exchanges/multi/{multiId}/tx")
.header("Authorization", "<api-key>")
.header("Content-Type", "application/json")
.body("{\n \"signatures\": [\n \"<string>\"\n ]\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api-partner.houdiniswap.com/v2/exchanges/multi/{multiId}/tx")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Authorization"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"signatures\": [\n \"<string>\"\n ]\n}"
response = http.request(request)
puts response.read_body{
"userOpHashes": [
"0x9c1d2e3f4a5b6c7d8e9f0a1b2c3d4e5f60718293a4b5c6d7e8f90a1b2c3d4e5f"
]
}{
"message": "<string>",
"code": "<string>",
"requestId": "<string>"
}{
"message": "<string>",
"code": "<string>",
"requestId": "<string>"
}{}{
"message": "<string>",
"code": "<string>",
"requestId": "<string>"
}{
"message": "<string>",
"code": "<string>",
"requestId": "<string>"
}{
"message": "<string>",
"code": "<string>",
"fields": {},
"requestId": "<string>"
}{
"message": "<string>",
"code": "<string>",
"requestId": "<string>"
}{
"message": "<string>",
"code": "<string>",
"requestId": "<string>"
}Bundler EVM
Submit signed transaction
Sends the batch on-chain, using the signatures from the user’s wallet.
- sign the
userOpHashof each batch from Build batch transaction, and send them in the same order - most groups fit in one batch, so usually one signature
- fund the smart account first, using
txDatafrom the build response. For an ERC-20 sourcetxData.tois the token contract, not the smart account - 404 means nothing is awaiting submission — either never built, or already submitted. Check Get batch status.
POST
/
exchanges
/
multi
/
{multiId}
/
tx
Submit signed transaction
curl --request POST \
--url https://api-partner.houdiniswap.com/v2/exchanges/multi/{multiId}/tx \
--header 'Authorization: <api-key>' \
--header 'Content-Type: application/json' \
--data '
{
"signatures": [
"<string>"
]
}
'import requests
url = "https://api-partner.houdiniswap.com/v2/exchanges/multi/{multiId}/tx"
payload = { "signatures": ["<string>"] }
headers = {
"Authorization": "<api-key>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {Authorization: '<api-key>', 'Content-Type': 'application/json'},
body: JSON.stringify({signatures: ['<string>']})
};
fetch('https://api-partner.houdiniswap.com/v2/exchanges/multi/{multiId}/tx', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://api-partner.houdiniswap.com/v2/exchanges/multi/{multiId}/tx",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'signatures' => [
'<string>'
]
]),
CURLOPT_HTTPHEADER => [
"Authorization: <api-key>",
"Content-Type: application/json"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://api-partner.houdiniswap.com/v2/exchanges/multi/{multiId}/tx"
payload := strings.NewReader("{\n \"signatures\": [\n \"<string>\"\n ]\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Authorization", "<api-key>")
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://api-partner.houdiniswap.com/v2/exchanges/multi/{multiId}/tx")
.header("Authorization", "<api-key>")
.header("Content-Type", "application/json")
.body("{\n \"signatures\": [\n \"<string>\"\n ]\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api-partner.houdiniswap.com/v2/exchanges/multi/{multiId}/tx")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Authorization"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"signatures\": [\n \"<string>\"\n ]\n}"
response = http.request(request)
puts response.read_body{
"userOpHashes": [
"0x9c1d2e3f4a5b6c7d8e9f0a1b2c3d4e5f60718293a4b5c6d7e8f90a1b2c3d4e5f"
]
}{
"message": "<string>",
"code": "<string>",
"requestId": "<string>"
}{
"message": "<string>",
"code": "<string>",
"requestId": "<string>"
}{}{
"message": "<string>",
"code": "<string>",
"requestId": "<string>"
}{
"message": "<string>",
"code": "<string>",
"requestId": "<string>"
}{
"message": "<string>",
"code": "<string>",
"fields": {},
"requestId": "<string>"
}{
"message": "<string>",
"code": "<string>",
"requestId": "<string>"
}{
"message": "<string>",
"code": "<string>",
"requestId": "<string>"
}Authorizations
Send Authorization: <ApiKey>:<ApiSecret> — joined by a colon, raw. No Bearer prefix, no base64.
Path Parameters
The multi exchange group ID
Maximum string length:
64Body
application/json
One signature per batch, in the same order as transactions in the build response.
Sign each batch's userOpHash as a message, with the same wallet you passed as sender when building. Pass the hash as bytes, not as a hex string — signing the "0x…" text produces a different digest and the submit is rejected.
- viem —
walletClient.signMessage({ account, message: { raw: userOpHash } }) - ethers v6 —
signer.signMessage(getBytes(userOpHash)) - ethers v5 —
signer.signMessage(ethers.utils.arrayify(userOpHash))
Minimum array length:
1Response
UserOperation(s) submitted
One hash per submitted batch — the on-chain reference for each UserOperation.