Retrieve a conversation
GET/v1/threads/{id}
A conversation: its state (participants, counts, last message, awaiting_reply, unread, metadata) and its received and sent emails, oldest first.
Requires a full-access key.
awaiting_reply: the last email a person wrote came in (automated mail does not count). unread: something was received after read_at (set with PATCH /threads/{id}).
Threads are derived from the standard In-Reply-To / References headers: no setup. Every received email, webhook email.received and send response carries its thread_id.
Refused messages are not part of a thread. At most 500 emails are listed (has_more); fetch bodies with GET /emails/receiving/{id} and GET /emails/{id}/content.
Emails received before 2026-10-23 have a thread id but are not listed here.
Path parameters
idstring (UUID)required- Thread id (
thread_idof any email in it)
Errors
restricted_api_keyHTTP 403not_foundHTTP 404- thread not found (or past your plan's log retention)
curl 'https://zapsmtp.xyz/v1/threads/3f1c9a52-6b0e-5d4f-8a71-2c9e0b4d6f13' \
-H "Authorization: Bearer $ZAP_API_KEY"const res = await fetch('https://zapsmtp.xyz/v1/threads/3f1c9a52-6b0e-5d4f-8a71-2c9e0b4d6f13', {
method: 'GET',
headers: {
Authorization: `Bearer ${process.env.ZAP_API_KEY}`,
},
});
// 204 No Content (e.g. a delete) has no body
const data = res.status === 204 ? null : await res.json();
if (!res.ok) throw new Error(`${data.name}: ${data.message}`);
console.log(data);import os
import requests
res = requests.get(
"https://zapsmtp.xyz/v1/threads/3f1c9a52-6b0e-5d4f-8a71-2c9e0b4d6f13",
headers={"Authorization": f"Bearer {os.environ['ZAP_API_KEY']}"},
timeout=30,
)
res.raise_for_status()
print(res.json() if res.status_code != 204 else "deleted")<?php
$ch = curl_init('https://zapsmtp.xyz/v1/threads/3f1c9a52-6b0e-5d4f-8a71-2c9e0b4d6f13');
curl_setopt_array($ch, [
CURLOPT_CUSTOMREQUEST => 'GET',
CURLOPT_RETURNTRANSFER => true,
CURLOPT_HTTPHEADER => [
'Authorization: Bearer ' . getenv('ZAP_API_KEY'),
],
]);
$data = json_decode(curl_exec($ch), true);
$status = curl_getinfo($ch, CURLINFO_RESPONSE_CODE);
if ($status >= 400) {
throw new RuntimeException($data['message']);
}
print_r($data);package main
import (
"fmt"
"io"
"net/http"
"os"
)
func main() {
req, err := http.NewRequest(
"GET",
"https://zapsmtp.xyz/v1/threads/3f1c9a52-6b0e-5d4f-8a71-2c9e0b4d6f13",
nil,
)
if err != nil {
panic(err)
}
req.Header.Set("Authorization", "Bearer "+os.Getenv("ZAP_API_KEY"))
res, err := http.DefaultClient.Do(req)
if err != nil {
panic(err)
}
defer res.Body.Close()
out, _ := io.ReadAll(res.Body)
fmt.Println(res.Status, string(out))
}require 'net/http'
require 'json'
uri = URI('https://zapsmtp.xyz/v1/threads/3f1c9a52-6b0e-5d4f-8a71-2c9e0b4d6f13')
req = Net::HTTP::Get.new(uri)
req['Authorization'] = "Bearer #{ENV.fetch('ZAP_API_KEY')}"
res = Net::HTTP.start(uri.host, uri.port, use_ssl: true) { |http| http.request(req) }
puts res.code, (JSON.parse(res.body) unless res.body.to_s.empty?)import java.net.URI;
import java.net.http.*;
public class ZapRequest {
public static void main(String[] args) throws Exception {
var request = HttpRequest.newBuilder(URI.create("https://zapsmtp.xyz/v1/threads/3f1c9a52-6b0e-5d4f-8a71-2c9e0b4d6f13"))
.header("Authorization", "Bearer " + System.getenv("ZAP_API_KEY"))
.method("GET", HttpRequest.BodyPublishers.noBody())
.build();
var response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandlers.ofString());
System.out.println(response.statusCode() + " " + response.body());
}
}using System.Net.Http.Headers;
using System.Text;
using var http = new HttpClient();
var request = new HttpRequestMessage(HttpMethod.Get, "https://zapsmtp.xyz/v1/threads/3f1c9a52-6b0e-5d4f-8a71-2c9e0b4d6f13");
request.Headers.Authorization = new AuthenticationHeaderValue(
"Bearer", Environment.GetEnvironmentVariable("ZAP_API_KEY"));
var response = await http.SendAsync(request);
Console.WriteLine($"{(int)response.StatusCode} {await response.Content.ReadAsStringAsync()}");ZAP_API_KEY in your environment.Response 200 OK
{
"object": "thread",
"id": "3f1c9a52-6b0e-5d4f-8a71-2c9e0b4d6f13",
"subject": "Where is my order?",
"participants": [
"jane@example.org",
"support@acme.com"
],
"message_count": 3,
"inbound_count": 2,
"outbound_count": 1,
"has_attachments": false,
"first_message_at": "2026-10-21T15:10:02.904Z",
"last_message_at": "2026-10-21T16:02:13.540Z",
"last_inbound_at": "2026-10-21T16:02:13.540Z",
"last_message": {
"id": "019a1f52-0c1d-7f2e-8a3b-4c5d6e7f8091",
"direction": "inbound",
"from": "jane@example.org",
"subject": "Re: Where is my order?"
},
"awaiting_reply": true,
"unread": true,
"read_at": null,
"metadata": {
"ticket": "T-1042"
},
"has_more": false,
"data": [
{
"object": "email",
"direction": "inbound",
"id": "019a1f30-1d4e-7a6b-8c2d-3e4f5a6b7c8d",
"created_at": "2026-10-21T15:10:02.904Z",
"from": "jane@example.org",
"to": [
"support@acme.com"
],
"cc": [],
"subject": "Where is my order?",
"message_id": "<CAF=abc123@mail.example.org>"
},
{
"object": "email",
"direction": "outbound",
"id": "019a1f41-8b2c-7e3d-9f40-5a6b7c8d9e0f",
"created_at": "2026-10-21T15:20:41.112Z",
"from": "Acme Support <support@acme.com>",
"to": [
"jane@example.org"
],
"cc": [],
"subject": "Re: Where is my order?"
},
{
"object": "email",
"direction": "inbound",
"id": "019a1f52-0c1d-7f2e-8a3b-4c5d6e7f8091",
"created_at": "2026-10-21T16:02:13.540Z",
"from": "jane@example.org",
"to": [
"support@acme.com"
],
"cc": [],
"subject": "Automatic reply: Where is my order?",
"message_id": "<CAF=def456@mail.example.org>",
"automated": "out_of_office"
}
]
}