Conversation API

nexmo · Company

Company No Auth Free & Open API

The Conversation API enables you to build conversation features where communication can take place across multiple mediums including IP Messaging, PSTN Voice, SMS and WebRTC Audio and Video. The context of the conversations is maintained though each communication event taking place within a conversation, no matter the medium.

Authentication

No authentication requiredFree to use with no key needed.

Sample Requests

GET List legs

List legs

https://api.apis.guru/v2/specs/nexmo.com/conversation/2.0.1/legs

Hover any highlighted part to learn what it does

curl -X GET "https://api.apis.guru/v2/specs/nexmo.com/conversation/2.0.1/legs"

import requests
response = requests.get(
    "https://api.apis.guru/v2/specs/nexmo.com/conversation/2.0.1/legs",
)
print(response.json())

const url = 'https://api.apis.guru/v2/specs/nexmo.com/conversation/2.0.1/legs';

const response = await fetch(url); 
const data = await response.json();
console.log(data);

package main

import (
	"fmt"
	"io"
	"net/http"
)

func main() {
	targetURL := "https://api.apis.guru/v2/specs/nexmo.com/conversation/2.0.1/legs"
	req, _ := http.NewRequest("GET", targetURL, nil)

	client := &http.Client{}
	resp, _ := client.Do(req)
	defer resp.Body.Close()
	body, _ := io.ReadAll(resp.Body)
	fmt.Println(string(body))
}

require "net/http"
require "json"

uri = URI("https://api.apis.guru/v2/specs/nexmo.com/conversation/2.0.1/legs")

http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = uri.scheme == "https"

req = Net::HTTP::Get.new(uri)

res = http.request(req)
puts JSON.parse(res.body)

<?php
$url = "https://api.apis.guru/v2/specs/nexmo.com/conversation/2.0.1/legs";
$opts = ["http" => [
    "method" => "GET",
]];
$ctx = stream_context_create($opts);
$res = file_get_contents($url, false, $ctx);
print_r(json_decode($res, true));

GET Retrieve a conversation

Retrieve a conversation

https://api.apis.guru/v2/specs/nexmo.com/conversation/2.0.1/conversations/{conversation_id}

Hover any highlighted part to learn what it does

curl -X GET "https://api.apis.guru/v2/specs/nexmo.com/conversation/2.0.1/conversations/{conversation_id}"

import requests
response = requests.get(
    "https://api.apis.guru/v2/specs/nexmo.com/conversation/2.0.1/conversations/{conversation_id}",
)
print(response.json())

const url = 'https://api.apis.guru/v2/specs/nexmo.com/conversation/2.0.1/conversations/{conversation_id}';

const response = await fetch(url); 
const data = await response.json();
console.log(data);

package main

import (
	"fmt"
	"io"
	"net/http"
)

func main() {
	targetURL := "https://api.apis.guru/v2/specs/nexmo.com/conversation/2.0.1/conversations/{conversation_id}"
	req, _ := http.NewRequest("GET", targetURL, nil)

	client := &http.Client{}
	resp, _ := client.Do(req)
	defer resp.Body.Close()
	body, _ := io.ReadAll(resp.Body)
	fmt.Println(string(body))
}

require "net/http"
require "json"

uri = URI("https://api.apis.guru/v2/specs/nexmo.com/conversation/2.0.1/conversations/{conversation_id}")

http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = uri.scheme == "https"

req = Net::HTTP::Get.new(uri)

res = http.request(req)
puts JSON.parse(res.body)

<?php
$url = "https://api.apis.guru/v2/specs/nexmo.com/conversation/2.0.1/conversations/{conversation_id}";
$opts = ["http" => [
    "method" => "GET",
]];
$ctx = stream_context_create($opts);
$res = file_get_contents($url, false, $ctx);
print_r(json_decode($res, true));

GET Retrieve a user

Retrieve a user

https://api.apis.guru/v2/specs/nexmo.com/conversation/2.0.1/users/{user_id}

Hover any highlighted part to learn what it does

curl -X GET "https://api.apis.guru/v2/specs/nexmo.com/conversation/2.0.1/users/{user_id}"

import requests
response = requests.get(
    "https://api.apis.guru/v2/specs/nexmo.com/conversation/2.0.1/users/{user_id}",
)
print(response.json())

const url = 'https://api.apis.guru/v2/specs/nexmo.com/conversation/2.0.1/users/{user_id}';

const response = await fetch(url); 
const data = await response.json();
console.log(data);

package main

import (
	"fmt"
	"io"
	"net/http"
)

func main() {
	targetURL := "https://api.apis.guru/v2/specs/nexmo.com/conversation/2.0.1/users/{user_id}"
	req, _ := http.NewRequest("GET", targetURL, nil)

	client := &http.Client{}
	resp, _ := client.Do(req)
	defer resp.Body.Close()
	body, _ := io.ReadAll(resp.Body)
	fmt.Println(string(body))
}

require "net/http"
require "json"

uri = URI("https://api.apis.guru/v2/specs/nexmo.com/conversation/2.0.1/users/{user_id}")

http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = uri.scheme == "https"

req = Net::HTTP::Get.new(uri)

res = http.request(req)
puts JSON.parse(res.body)

<?php
$url = "https://api.apis.guru/v2/specs/nexmo.com/conversation/2.0.1/users/{user_id}";
$opts = ["http" => [
    "method" => "GET",
]];
$ctx = stream_context_create($opts);
$res = file_get_contents($url, false, $ctx);
print_r(json_decode($res, true));

Postman Setup Guide

Get Postman ↗

See official documentation for authentication and setup.

What can you build with Conversation API?

Conversation API is a Company API. Developers commonly use company APIs for:

enriching CRM records with company firmographics
building lead-generation and prospecting tools
verifying business identity and registration details
monitoring competitors and market intelligence
powering B2B data enrichment pipelines

No authentication required. This API is open — no signup or key needed. Ideal for quick prototypes and public-facing features. Conversation API is free to use, making it a low-risk choice to experiment with.

New to APIs? Read our beginner's guide · Learn about API keys · What is REST?

Open documentation ↗