curl --request POST \
--url https://api.verlon.ai/v3/chat \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '
{
"gateId": "<string>",
"data": {
"messages": [
"<unknown>"
],
"vars": {}
},
"model": "<string>",
"metadata": "<unknown>",
"endUserId": "<string>",
"sessionId": "<string>"
}
'import requests
url = "https://api.verlon.ai/v3/chat"
payload = {
"gateId": "<string>",
"data": {
"messages": ["<unknown>"],
"vars": {}
},
"model": "<string>",
"metadata": "<unknown>",
"endUserId": "<string>",
"sessionId": "<string>"
}
headers = {
"Authorization": "Bearer <token>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
body: JSON.stringify({
gateId: '<string>',
data: {messages: ['<unknown>'], vars: {}},
model: '<string>',
metadata: '<unknown>',
endUserId: '<string>',
sessionId: '<string>'
})
};
fetch('https://api.verlon.ai/v3/chat', 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.verlon.ai/v3/chat",
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([
'gateId' => '<string>',
'data' => [
'messages' => [
'<unknown>'
],
'vars' => [
]
],
'model' => '<string>',
'metadata' => '<unknown>',
'endUserId' => '<string>',
'sessionId' => '<string>'
]),
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>",
"Content-Type: application/json"
],
]);
$response = curl_exec($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.verlon.ai/v3/chat"
payload := strings.NewReader("{\n \"gateId\": \"<string>\",\n \"data\": {\n \"messages\": [\n \"<unknown>\"\n ],\n \"vars\": {}\n },\n \"model\": \"<string>\",\n \"metadata\": \"<unknown>\",\n \"endUserId\": \"<string>\",\n \"sessionId\": \"<string>\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Authorization", "Bearer <token>")
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.verlon.ai/v3/chat")
.header("Authorization", "Bearer <token>")
.header("Content-Type", "application/json")
.body("{\n \"gateId\": \"<string>\",\n \"data\": {\n \"messages\": [\n \"<unknown>\"\n ],\n \"vars\": {}\n },\n \"model\": \"<string>\",\n \"metadata\": \"<unknown>\",\n \"endUserId\": \"<string>\",\n \"sessionId\": \"<string>\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.verlon.ai/v3/chat")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"gateId\": \"<string>\",\n \"data\": {\n \"messages\": [\n \"<unknown>\"\n ],\n \"vars\": {}\n },\n \"model\": \"<string>\",\n \"metadata\": \"<unknown>\",\n \"endUserId\": \"<string>\",\n \"sessionId\": \"<string>\"\n}"
response = http.request(request)
puts response.read_body{
"error": "<string>",
"message": "<string>",
"details": "<unknown>"
}{
"error": "<string>",
"message": "<string>",
"details": "<unknown>"
}{
"error": "<string>",
"message": "<string>",
"details": "<unknown>"
}Create a chat completion via a Verlon gate
Use when: caller wants a chat completion (multi-turn or single-prompt) routed through a Verlon gate with automatic provider failover, quality scoring, and usage tracking
Routes a chat completion request through the named Verlon gate. The gate decides which underlying model+provider serves the request based on its current configuration (primary model, fallback chain, parameter overrides). Supports both streaming and non-streaming responses. Verlon handles provider auth, billing, observability, and fallback on failure.
curl --request POST \
--url https://api.verlon.ai/v3/chat \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '
{
"gateId": "<string>",
"data": {
"messages": [
"<unknown>"
],
"vars": {}
},
"model": "<string>",
"metadata": "<unknown>",
"endUserId": "<string>",
"sessionId": "<string>"
}
'import requests
url = "https://api.verlon.ai/v3/chat"
payload = {
"gateId": "<string>",
"data": {
"messages": ["<unknown>"],
"vars": {}
},
"model": "<string>",
"metadata": "<unknown>",
"endUserId": "<string>",
"sessionId": "<string>"
}
headers = {
"Authorization": "Bearer <token>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
body: JSON.stringify({
gateId: '<string>',
data: {messages: ['<unknown>'], vars: {}},
model: '<string>',
metadata: '<unknown>',
endUserId: '<string>',
sessionId: '<string>'
})
};
fetch('https://api.verlon.ai/v3/chat', 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.verlon.ai/v3/chat",
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([
'gateId' => '<string>',
'data' => [
'messages' => [
'<unknown>'
],
'vars' => [
]
],
'model' => '<string>',
'metadata' => '<unknown>',
'endUserId' => '<string>',
'sessionId' => '<string>'
]),
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>",
"Content-Type: application/json"
],
]);
$response = curl_exec($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.verlon.ai/v3/chat"
payload := strings.NewReader("{\n \"gateId\": \"<string>\",\n \"data\": {\n \"messages\": [\n \"<unknown>\"\n ],\n \"vars\": {}\n },\n \"model\": \"<string>\",\n \"metadata\": \"<unknown>\",\n \"endUserId\": \"<string>\",\n \"sessionId\": \"<string>\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Authorization", "Bearer <token>")
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.verlon.ai/v3/chat")
.header("Authorization", "Bearer <token>")
.header("Content-Type", "application/json")
.body("{\n \"gateId\": \"<string>\",\n \"data\": {\n \"messages\": [\n \"<unknown>\"\n ],\n \"vars\": {}\n },\n \"model\": \"<string>\",\n \"metadata\": \"<unknown>\",\n \"endUserId\": \"<string>\",\n \"sessionId\": \"<string>\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.verlon.ai/v3/chat")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"gateId\": \"<string>\",\n \"data\": {\n \"messages\": [\n \"<unknown>\"\n ],\n \"vars\": {}\n },\n \"model\": \"<string>\",\n \"metadata\": \"<unknown>\",\n \"endUserId\": \"<string>\",\n \"sessionId\": \"<string>\"\n}"
response = http.request(request)
puts response.read_body{
"error": "<string>",
"message": "<string>",
"details": "<unknown>"
}{
"error": "<string>",
"message": "<string>",
"details": "<unknown>"
}{
"error": "<string>",
"message": "<string>",
"details": "<unknown>"
}Authorizations
Verlon API key (newly minted keys are prefixed sk-vrln-; legacy verlon_* and layer_* keys from prior prefix migrations continue to validate). Generated from the dashboard under Settings → API Keys, or via verlon key create in the CLI.
Body
Response
Chat completion response. Shape matches the underlying provider format selected by the gate (OpenAI-compatible by default). For streaming requests, returns SSE chunks instead of a single JSON body.

