curl --request POST \
--url https://nexus.gerowallet.io/api/midnight/{network}/dust/build-registration-tx \
--header 'Content-Type: application/json' \
--header 'X-Api-Key: <api-key>' \
--data '
{
"cardano_address": "<string>",
"dust_address_hex": "<string>",
"payment_key_hash_hex": "<string>"
}
'import requests
url = "https://nexus.gerowallet.io/api/midnight/{network}/dust/build-registration-tx"
payload = {
"cardano_address": "<string>",
"dust_address_hex": "<string>",
"payment_key_hash_hex": "<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({
cardano_address: '<string>',
dust_address_hex: '<string>',
payment_key_hash_hex: '<string>'
})
};
fetch('https://nexus.gerowallet.io/api/midnight/{network}/dust/build-registration-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://nexus.gerowallet.io/api/midnight/{network}/dust/build-registration-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([
'cardano_address' => '<string>',
'dust_address_hex' => '<string>',
'payment_key_hash_hex' => '<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}/dust/build-registration-tx"
payload := strings.NewReader("{\n \"cardano_address\": \"<string>\",\n \"dust_address_hex\": \"<string>\",\n \"payment_key_hash_hex\": \"<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}/dust/build-registration-tx")
.header("X-Api-Key", "<api-key>")
.header("Content-Type", "application/json")
.body("{\n \"cardano_address\": \"<string>\",\n \"dust_address_hex\": \"<string>\",\n \"payment_key_hash_hex\": \"<string>\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://nexus.gerowallet.io/api/midnight/{network}/dust/build-registration-tx")
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 \"cardano_address\": \"<string>\",\n \"dust_address_hex\": \"<string>\",\n \"payment_key_hash_hex\": \"<string>\"\n}"
response = http.request(request)
puts response.read_body{
"status": "<string>",
"tx_cbor": "<string>",
"tx_hash": "<string>",
"validator_address": "<string>",
"validator_script_hash": "<string>",
"datum_cbor": "<string>",
"redeemer_cbor": "<string>",
"mint_asset": {
"policy_id": "<string>",
"asset_name_hex": "<string>",
"quantity": 123
},
"note": "<string>",
"sponsored_collateral_ref": "<string>"
}Build the DUST registration tx (Cardano)
Builds the unsigned DUST registration Cardano tx (status=‘complete’). The datum’s c_wallet is the address’s STAKE key hash (the credential the Midnight indexer keys registrations on, matching the portal). Returns tx_cbor ready for the wallet to vkey-sign with BOTH payment and stake keys and submit via the standard Cardano submit flow, plus the primitives (validator address, datum, redeemer, mint spec) for verification.
curl --request POST \
--url https://nexus.gerowallet.io/api/midnight/{network}/dust/build-registration-tx \
--header 'Content-Type: application/json' \
--header 'X-Api-Key: <api-key>' \
--data '
{
"cardano_address": "<string>",
"dust_address_hex": "<string>",
"payment_key_hash_hex": "<string>"
}
'import requests
url = "https://nexus.gerowallet.io/api/midnight/{network}/dust/build-registration-tx"
payload = {
"cardano_address": "<string>",
"dust_address_hex": "<string>",
"payment_key_hash_hex": "<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({
cardano_address: '<string>',
dust_address_hex: '<string>',
payment_key_hash_hex: '<string>'
})
};
fetch('https://nexus.gerowallet.io/api/midnight/{network}/dust/build-registration-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://nexus.gerowallet.io/api/midnight/{network}/dust/build-registration-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([
'cardano_address' => '<string>',
'dust_address_hex' => '<string>',
'payment_key_hash_hex' => '<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}/dust/build-registration-tx"
payload := strings.NewReader("{\n \"cardano_address\": \"<string>\",\n \"dust_address_hex\": \"<string>\",\n \"payment_key_hash_hex\": \"<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}/dust/build-registration-tx")
.header("X-Api-Key", "<api-key>")
.header("Content-Type", "application/json")
.body("{\n \"cardano_address\": \"<string>\",\n \"dust_address_hex\": \"<string>\",\n \"payment_key_hash_hex\": \"<string>\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://nexus.gerowallet.io/api/midnight/{network}/dust/build-registration-tx")
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 \"cardano_address\": \"<string>\",\n \"dust_address_hex\": \"<string>\",\n \"payment_key_hash_hex\": \"<string>\"\n}"
response = http.request(request)
puts response.read_body{
"status": "<string>",
"tx_cbor": "<string>",
"tx_hash": "<string>",
"validator_address": "<string>",
"validator_script_hash": "<string>",
"datum_cbor": "<string>",
"redeemer_cbor": "<string>",
"mint_asset": {
"policy_id": "<string>",
"asset_name_hex": "<string>",
"quantity": 123
},
"note": "<string>",
"sponsored_collateral_ref": "<string>"
}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.