curl --request POST \
--url https://staging.apimonaco.xyz/api/v1/orders/cancel \
--header 'Content-Type: application/json' \
--header 'X-Monaco-Signature: <api-key>' \
--data '
{
"orderId": "123e4567-e89b-12d3-a456-426614174000",
"remainingQuantityTarget": "0.5"
}
'import requests
url = "https://staging.apimonaco.xyz/api/v1/orders/cancel"
payload = {
"orderId": "123e4567-e89b-12d3-a456-426614174000",
"remainingQuantityTarget": "0.5"
}
headers = {
"X-Monaco-Signature": "<api-key>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {'X-Monaco-Signature': '<api-key>', 'Content-Type': 'application/json'},
body: JSON.stringify({
orderId: '123e4567-e89b-12d3-a456-426614174000',
remainingQuantityTarget: '0.5'
})
};
fetch('https://staging.apimonaco.xyz/api/v1/orders/cancel', 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://staging.apimonaco.xyz/api/v1/orders/cancel",
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([
'orderId' => '123e4567-e89b-12d3-a456-426614174000',
'remainingQuantityTarget' => '0.5'
]),
CURLOPT_HTTPHEADER => [
"Content-Type: application/json",
"X-Monaco-Signature: <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://staging.apimonaco.xyz/api/v1/orders/cancel"
payload := strings.NewReader("{\n \"orderId\": \"123e4567-e89b-12d3-a456-426614174000\",\n \"remainingQuantityTarget\": \"0.5\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("X-Monaco-Signature", "<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://staging.apimonaco.xyz/api/v1/orders/cancel")
.header("X-Monaco-Signature", "<api-key>")
.header("Content-Type", "application/json")
.body("{\n \"orderId\": \"123e4567-e89b-12d3-a456-426614174000\",\n \"remainingQuantityTarget\": \"0.5\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://staging.apimonaco.xyz/api/v1/orders/cancel")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["X-Monaco-Signature"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"orderId\": \"123e4567-e89b-12d3-a456-426614174000\",\n \"remainingQuantityTarget\": \"0.5\"\n}"
response = http.request(request)
puts response.read_body{
"orderId": "123e4567-e89b-12d3-a456-426614174000",
"status": "SUCCESS",
"message": "Order cancelled successfully"
}Cancel existing order
Cancel existing order.
Cancel an existing order and unlock the reserved funds. Only orders that are not yet filled can be cancelled.
curl --request POST \
--url https://staging.apimonaco.xyz/api/v1/orders/cancel \
--header 'Content-Type: application/json' \
--header 'X-Monaco-Signature: <api-key>' \
--data '
{
"orderId": "123e4567-e89b-12d3-a456-426614174000",
"remainingQuantityTarget": "0.5"
}
'import requests
url = "https://staging.apimonaco.xyz/api/v1/orders/cancel"
payload = {
"orderId": "123e4567-e89b-12d3-a456-426614174000",
"remainingQuantityTarget": "0.5"
}
headers = {
"X-Monaco-Signature": "<api-key>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {'X-Monaco-Signature': '<api-key>', 'Content-Type': 'application/json'},
body: JSON.stringify({
orderId: '123e4567-e89b-12d3-a456-426614174000',
remainingQuantityTarget: '0.5'
})
};
fetch('https://staging.apimonaco.xyz/api/v1/orders/cancel', 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://staging.apimonaco.xyz/api/v1/orders/cancel",
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([
'orderId' => '123e4567-e89b-12d3-a456-426614174000',
'remainingQuantityTarget' => '0.5'
]),
CURLOPT_HTTPHEADER => [
"Content-Type: application/json",
"X-Monaco-Signature: <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://staging.apimonaco.xyz/api/v1/orders/cancel"
payload := strings.NewReader("{\n \"orderId\": \"123e4567-e89b-12d3-a456-426614174000\",\n \"remainingQuantityTarget\": \"0.5\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("X-Monaco-Signature", "<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://staging.apimonaco.xyz/api/v1/orders/cancel")
.header("X-Monaco-Signature", "<api-key>")
.header("Content-Type", "application/json")
.body("{\n \"orderId\": \"123e4567-e89b-12d3-a456-426614174000\",\n \"remainingQuantityTarget\": \"0.5\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://staging.apimonaco.xyz/api/v1/orders/cancel")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["X-Monaco-Signature"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"orderId\": \"123e4567-e89b-12d3-a456-426614174000\",\n \"remainingQuantityTarget\": \"0.5\"\n}"
response = http.request(request)
puts response.read_body{
"orderId": "123e4567-e89b-12d3-a456-426614174000",
"status": "SUCCESS",
"message": "Order cancelled successfully"
}Authorizations
Ed25519 session-key request signing. Every authenticated request carries three headers: X-Monaco-PublicKey (64-char lowercase-hex session public key), X-Monaco-Timestamp (Unix milliseconds, within 30s of server time), and X-Monaco-Signature (hex ed25519 signature). The signature is over METHOD\npath?query\ntimestamp_ms\nSHA256_hex(body), where the body hash is the SHA-256 of the empty byte string when there is no body. Obtain the session keypair from POST /api/v1/auth/challenge followed by POST /api/v1/auth/verify.
Body
Order UUID to cancel
"123e4567-e89b-12d3-a456-426614174000"
Partial cancel: reduce the resting order in place to this remaining quantity, keeping its queue position. A target ("leave this much resting"), not an amount to remove, so a retried request converges. Must be a positive multiple of the market's quantity step, strictly below the order's current remaining quantity; the delta is released exactly as a cancel releases it (spot unlock / margin reserve). Omit for a full cancel.
"0.5"
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