curl --request POST \
  --url https://api.stabyl.com/v1/partner/exchange/orders/estimate \
  --header 'Content-Type: application/json' \
  --header 'X-Api-Key: <api-key>' \
  --data '
{
  "business_bps": 25,
  "pair_id": "USD/NGN",
  "quantity": "100.00",
  "side": "buy"
}
'

import requests

url = "https://api.stabyl.com/v1/partner/exchange/orders/estimate"

payload = {
    "business_bps": 25,
    "pair_id": "USD/NGN",
    "quantity": "100.00",
    "side": "buy"
}
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({business_bps: 25, pair_id: 'USD/NGN', quantity: '100.00', side: 'buy'})
};

fetch('https://api.stabyl.com/v1/partner/exchange/orders/estimate', 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.stabyl.com/v1/partner/exchange/orders/estimate",
  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([
    'business_bps' => 25,
    'pair_id' => 'USD/NGN',
    'quantity' => '100.00',
    'side' => 'buy'
  ]),
  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://api.stabyl.com/v1/partner/exchange/orders/estimate"

	payload := strings.NewReader("{\n  \"business_bps\": 25,\n  \"pair_id\": \"USD/NGN\",\n  \"quantity\": \"100.00\",\n  \"side\": \"buy\"\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://api.stabyl.com/v1/partner/exchange/orders/estimate")
  .header("X-Api-Key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"business_bps\": 25,\n  \"pair_id\": \"USD/NGN\",\n  \"quantity\": \"100.00\",\n  \"side\": \"buy\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.stabyl.com/v1/partner/exchange/orders/estimate")

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  \"business_bps\": 25,\n  \"pair_id\": \"USD/NGN\",\n  \"quantity\": \"100.00\",\n  \"side\": \"buy\"\n}"

response = http.request(request)
puts response.read_body

{
  "data": {
    "business_bps": 25,
    "client_quote_notional": "150375",
    "client_quote_price": "1503.75",
    "estimated_at": "2026-09-29T12:00:00Z",
    "estimated_average_price": "1500",
    "estimated_fee_base": "0.10",
    "estimated_fill_quantity": "100",
    "estimated_notional": "150000",
    "estimated_slippage_bps": 0,
    "expires_at": "2026-09-29T12:00:30Z",
    "fee_bps": 10,
    "orderbook_sequence": 42,
    "pair_id": "USD/NGN",
    "protected_limit_price": "1507.50",
    "quantity": "100",
    "quote_id": "01999a40-0000-7000-8000-000000000001",
    "reference_price": "1500",
    "side": "buy",
    "slippage_tolerance_bps": 50,
    "sufficient_liquidity": true
  },
  "status": "success"
}

{
  "error": {
    "code": "VALIDATION_FAILED",
    "message": "invalid request parameters"
  },
  "status": "error"
}

{
  "error": {
    "code": "UNAUTHORIZED",
    "message": "missing X-Api-Key header"
  },
  "status": "error"
}