curl --request POST \
--url https://nexus.gerowallet.io/api/midnight/{network}/tx/prove-and-submit \
--header 'Content-Type: application/json' \
--header 'X-Api-Key: <api-key>' \
--data '
{
"signedTxHex": "<string>",
"waitFor": "<string>"
}
'import requests
url = "https://nexus.gerowallet.io/api/midnight/{network}/tx/prove-and-submit"
payload = {
"signedTxHex": "<string>",
"waitFor": "<string>"
}
headers = {
"X-Api-Key": "<api-key>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {'X-Api-Key': '<api-key>', 'Content-Type': 'application/json'},
body: JSON.stringify({signedTxHex: '<string>', waitFor: '<string>'})
};
fetch('https://nexus.gerowallet.io/api/midnight/{network}/tx/prove-and-submit', 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://nexus.gerowallet.io/api/midnight/{network}/tx/prove-and-submit",
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([
'signedTxHex' => '<string>',
'waitFor' => '<string>'
]),
CURLOPT_HTTPHEADER => [
"Content-Type: application/json",
"X-Api-Key: <api-key>"
],
]);
$response = curl_exec($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://nexus.gerowallet.io/api/midnight/{network}/tx/prove-and-submit"
payload := strings.NewReader("{\n \"signedTxHex\": \"<string>\",\n \"waitFor\": \"<string>\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("X-Api-Key", "<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://nexus.gerowallet.io/api/midnight/{network}/tx/prove-and-submit")
.header("X-Api-Key", "<api-key>")
.header("Content-Type", "application/json")
.body("{\n \"signedTxHex\": \"<string>\",\n \"waitFor\": \"<string>\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://nexus.gerowallet.io/api/midnight/{network}/tx/prove-and-submit")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["X-Api-Key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"signedTxHex\": \"<string>\",\n \"waitFor\": \"<string>\"\n}"
response = http.request(request)
puts response.read_body{
"txHash": "<string>",
"status": "<string>",
"blockHash": "<string>",
"blockHeight": 123
}Prove and submit a shielded transaction
Proves, binds, and submits a SHIELDED Midnight transaction the wallet built locally. The wallet uploads the signed-but-unproven tx hex (markers signature/pre-proof/pre-binding); the sidecar runs the ZK prover, binds the tx, and submits via midnight.sendMnTransaction. The body carries witness data the user has consented to Gero handling for proving; it is never logged or persisted on the relay path. Returns the substrate tx hash on submit.
curl --request POST \
--url https://nexus.gerowallet.io/api/midnight/{network}/tx/prove-and-submit \
--header 'Content-Type: application/json' \
--header 'X-Api-Key: <api-key>' \
--data '
{
"signedTxHex": "<string>",
"waitFor": "<string>"
}
'import requests
url = "https://nexus.gerowallet.io/api/midnight/{network}/tx/prove-and-submit"
payload = {
"signedTxHex": "<string>",
"waitFor": "<string>"
}
headers = {
"X-Api-Key": "<api-key>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {'X-Api-Key': '<api-key>', 'Content-Type': 'application/json'},
body: JSON.stringify({signedTxHex: '<string>', waitFor: '<string>'})
};
fetch('https://nexus.gerowallet.io/api/midnight/{network}/tx/prove-and-submit', 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://nexus.gerowallet.io/api/midnight/{network}/tx/prove-and-submit",
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([
'signedTxHex' => '<string>',
'waitFor' => '<string>'
]),
CURLOPT_HTTPHEADER => [
"Content-Type: application/json",
"X-Api-Key: <api-key>"
],
]);
$response = curl_exec($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://nexus.gerowallet.io/api/midnight/{network}/tx/prove-and-submit"
payload := strings.NewReader("{\n \"signedTxHex\": \"<string>\",\n \"waitFor\": \"<string>\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("X-Api-Key", "<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://nexus.gerowallet.io/api/midnight/{network}/tx/prove-and-submit")
.header("X-Api-Key", "<api-key>")
.header("Content-Type", "application/json")
.body("{\n \"signedTxHex\": \"<string>\",\n \"waitFor\": \"<string>\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://nexus.gerowallet.io/api/midnight/{network}/tx/prove-and-submit")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["X-Api-Key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"signedTxHex\": \"<string>\",\n \"waitFor\": \"<string>\"\n}"
response = http.request(request)
puts response.read_body{
"txHash": "<string>",
"status": "<string>",
"blockHash": "<string>",
"blockHeight": 123
}Authorizations
API key (programmatic access — recommended)
Send your API key in the X-Api-Key header. Keys start with nxs_ and are
created in the dashboard (or via POST /api/keys with a session JWT).
Each key is scoped to one chain and one network (for example
CARDANO_MAINNET), fixed at creation time. It cannot query a different network
on the same chain, and it cannot query a different chain at all. A mismatched
network parameter returns 400 Network Mismatch. Create one key per chain
and network under the same account.
This is the credential most integrations should use.