BIC Validation API

<?php
$ch = curl_init('https://api.iban.com/clients/api/swiftv2/bic/');
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_POSTFIELDS     => http_build_query([
        'api_key' => 'YOUR_API_KEY',
        'format'  => 'json',
        'bic'     => 'BARCGB22XXX',
    ]),
]);
$result = json_decode(curl_exec($ch), true);   // the whole response as an array
curl_close($ch);

echo json_encode($result, JSON_PRETTY_PRINT), PHP_EOL;

import json
import requests

r = requests.post('https://api.iban.com/clients/api/swiftv2/bic/', data={
    'api_key': 'YOUR_API_KEY',
    'format': 'json',
    'bic': 'BARCGB22XXX',
})
result = r.json()   # the whole response as a dict
print(json.dumps(result, indent=3))

const body = new URLSearchParams({
  api_key: 'YOUR_API_KEY',
  format: 'json',
  bic: 'BARCGB22XXX',
});

fetch('https://api.iban.com/clients/api/swiftv2/bic/', { method: 'POST', body })
  .then(res => res.json())
  .then(result => console.log(JSON.stringify(result, null, 3)));   // result: the whole response as an object

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

public class BicApi {
    public static void main(String[] args) throws Exception {
        String body = "api_key=YOUR_API_KEY&format=json&bic=BARCGB22XXX";
        HttpRequest request = HttpRequest.newBuilder()
            .uri(URI.create("https://api.iban.com/clients/api/swiftv2/bic/"))
            .header("Content-Type", "application/x-www-form-urlencoded")
            .POST(HttpRequest.BodyPublishers.ofString(body))
            .build();
        HttpResponse<String> response = HttpClient.newHttpClient()
            .send(request, HttpResponse.BodyHandlers.ofString());
        System.out.println(response.body());   // the whole JSON response; parse it with Jackson or Gson
    }
}

using System;
using System.Collections.Generic;
using System.Net.Http;
using System.Text.Json;
using System.Text.Json.Nodes;

var client = new HttpClient();
var form = new FormUrlEncodedContent(new Dictionary<string, string>
{
    ["api_key"] = "YOUR_API_KEY",
    ["format"]  = "json",
    ["bic"]     = "BARCGB22XXX",
});
var response = await client.PostAsync("https://api.iban.com/clients/api/swiftv2/bic/", form);
var result = JsonNode.Parse(await response.Content.ReadAsStringAsync());   // the whole response
Console.WriteLine(result?.ToJsonString(new JsonSerializerOptions { WriteIndented = true }));

package main

import (
	"encoding/json"
	"fmt"
	"net/http"
	"net/url"
)

func main() {
	form := url.Values{
		"api_key": {"YOUR_API_KEY"},
		"format":  {"json"},
		"bic":     {"BARCGB22XXX"},
	}
	resp, err := http.PostForm("https://api.iban.com/clients/api/swiftv2/bic/", form)
	if err != nil {
		panic(err)
	}
	defer resp.Body.Close()

	var result map[string]any // the whole response
	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
		panic(err)
	}
	out, _ := json.MarshalIndent(result, "", "   ")
	fmt.Println(string(out))
}

<?xml version="1.0"?>
<result>
   <query>
      <bic>BARCGB22XXX</bic>
      <success>true</success>
   </query>
   <bic_valid>true</bic_valid>
   <bic_active>true</bic_active>
   <directory_results>
      <bic>BARCGB22XXX</bic>
      <bic8>BARCGB22</bic8>
      <bic_branch>XXX</bic_branch>
      <institution>FINANCIAL</institution>
      <name>BARCLAYS BANK PLC</name>
      <branch_name>ALL U.K. OFFICES</branch_name>
      <office>HEAD OFFICE</office>
      <address>1 CHURCHILL PLACE</address>
      <city>LONDON</city>
      <zip>E14 5HP</zip>
      <country_name>UNITED KINGDOM</country_name>
      <iso_country_code>GB</iso_country_code>
   </directory_results>
   <services>
      <service>
         <code>FIN</code>
         <description>MANY-TO-MANY FIN PAYMENT SERVICE</description>
      </service>
      <service>
         <code>SCO</code>
         <description>SCORE FIN</description>
      </service>
   </services>
   <error>
      <code/>
      <message/>
   </error>
</result>

<?xml version="1.0"?>
<result>
   <query>
      <bic>ZZZZZZ99XXX</bic>
      <success>true</success>
   </query>
   <bic_valid>false</bic_valid>
   <bic_active>false</bic_active>
   <directory_results/>
   <services/>
   <error>
      <code>803</code>
      <message>BIC Code not found in directory.</message>
   </error>
</result>

<?xml version="1.0"?>
<result>
   <query>
      <bic/>
      <success>false</success>
   </query>
   <bic_valid>false</bic_valid>
   <bic_active>false</bic_active>
   <directory_results/>
   <services/>
   <error>
      <code>301</code>
      <message>API Key is invalid</message>
   </error>
</result>

<?xml version="1.0"?>
<result>
   <query>
      <country>US</country>
      <bank_name>natwest</bank_name>
      <success>true</success>
   </query>
   <bic_valid>false</bic_valid>
   <bic_active>false</bic_active>
   <directory_results>
      <record>
         <bic>RBOSUS3GXXX</bic>
         <bic8>RBOSUS3G</bic8>
         <bic_branch>XXX</bic_branch>
         <institution>FINANCIAL</institution>
         <name>NATWEST MARKETS SECURITIES INC.</name>
         <branch_name/>
         <bic_active>1</bic_active>
         <office>BRANCH</office>
         <address>600 WASHINGTON BLVD</address>
         <city>STAMFORD,CT</city>
         <zip>06901</zip>
         <country_name>UNITED STATES OF AMERICA</country_name>
         <iso_country_code>US</iso_country_code>
         <services/>
      </record>
      <record>
         <bic>GRNWUS33FUT</bic>
         <bic8>GRNWUS33</bic8>
         <bic_branch>FUT</bic_branch>
         <institution>FINANCIAL</institution>
         <name>NATWEST MARKETS SECURITIES INC.</name>
         <branch_name>FUTURES</branch_name>
         <bic_active>1</bic_active>
         <office>BRANCH</office>
         <address>600 WASHINGTON BLVD</address>
         <city>STAMFORD,CT</city>
         <zip>06901</zip>
         <country_name>UNITED STATES OF AMERICA</country_name>
         <iso_country_code>US</iso_country_code>
         <services/>
      </record>
      <record>
         <bic>GRNWUS3EXXX</bic>
         <bic8>GRNWUS3E</bic8>
         <bic_branch>XXX</bic_branch>
         <institution>FINANCIAL</institution>
         <name>NATWEST MARKETS SECURITIES INC.</name>
         <branch_name/>
         <bic_active>1</bic_active>
         <office>BRANCH</office>
         <address>600 WASHINGTON BLVD</address>
         <city>STAMFORD,CT</city>
         <zip>06901</zip>
         <country_name>UNITED STATES OF AMERICA</country_name>
         <iso_country_code>US</iso_country_code>
         <services/>
      </record>
      <record>
         <bic>GRNWUS33XXX</bic>
         <bic8>GRNWUS33</bic8>
         <bic_branch>XXX</bic_branch>
         <institution>FINANCIAL</institution>
         <name>NATWEST MARKETS SECURITIES INC.</name>
         <branch_name/>
         <bic_active>1</bic_active>
         <office>HEAD OFFICE</office>
         <address>600 WASHINGTON BLVD</address>
         <city>STAMFORD,CT</city>
         <zip>06901</zip>
         <country_name>UNITED STATES OF AMERICA</country_name>
         <iso_country_code>US</iso_country_code>
         <services/>
      </record>
   </directory_results>
   <services/>
   <error>
      <code/>
      <message/>
   </error>
</result>

<?xml version="1.0"?>
<result>
   <query>
      <country>US</country>
      <bank_name>zzzzqqqqxx</bank_name>
      <success>false</success>
   </query>
   <bic_valid>false</bic_valid>
   <bic_active>false</bic_active>
   <directory_results/>
   <services/>
   <error>
      <code>808</code>
      <message>No records found in directory.</message>
   </error>
</result>