Proxy Chat Completions
curl --request POST \
--url https://api.promptguard.co/api/v1/chat/completions \
--header 'Content-Type: application/json' \
--header 'X-API-Key: <api-key>' \
--data '
{
"model": "<string>",
"messages": [
{}
],
"stream": true,
"fallback_models": [
"<string>"
]
}
'import requests
url = "https://api.promptguard.co/api/v1/chat/completions"
payload = {
"model": "<string>",
"messages": [{}],
"stream": True,
"fallback_models": ["<string>"]
}
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({model: '<string>', messages: [{}], stream: true, fallback_models: ['<string>']})
};
fetch('https://api.promptguard.co/api/v1/chat/completions', 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.promptguard.co/api/v1/chat/completions",
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([
'model' => '<string>',
'messages' => [
[
]
],
'stream' => true,
'fallback_models' => [
'<string>'
]
]),
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.promptguard.co/api/v1/chat/completions"
payload := strings.NewReader("{\n \"model\": \"<string>\",\n \"messages\": [\n {}\n ],\n \"stream\": true,\n \"fallback_models\": [\n \"<string>\"\n ]\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.promptguard.co/api/v1/chat/completions")
.header("X-API-Key", "<api-key>")
.header("Content-Type", "application/json")
.body("{\n \"model\": \"<string>\",\n \"messages\": [\n {}\n ],\n \"stream\": true,\n \"fallback_models\": [\n \"<string>\"\n ]\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.promptguard.co/api/v1/chat/completions")
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 \"model\": \"<string>\",\n \"messages\": [\n {}\n ],\n \"stream\": true,\n \"fallback_models\": [\n \"<string>\"\n ]\n}"
response = http.request(request)
puts response.read_body{
"id": "chatcmpl-Ef5ekglmKoFkUSKUMWYOZPXC5peNv",
"object": "chat.completion",
"created": 1793461898,
"model": "gpt-5-nano-2025-08-07",
"choices": [
{
"index": 0,
"message": {
"role": "assistant",
"content": "Paris",
"refusal": null,
"annotations": []
},
"finish_reason": "stop"
}
],
"usage": {
"prompt_tokens": 18,
"completion_tokens": 138,
"total_tokens": 156
},
"service_tier": "default",
"system_fingerprint": null
}Proxy Chat Completions
Proxy OpenAI-style chat completions through policy engine
Guide: OpenAI
POST
/
api
/
v1
/
chat
/
completions
Proxy Chat Completions
curl --request POST \
--url https://api.promptguard.co/api/v1/chat/completions \
--header 'Content-Type: application/json' \
--header 'X-API-Key: <api-key>' \
--data '
{
"model": "<string>",
"messages": [
{}
],
"stream": true,
"fallback_models": [
"<string>"
]
}
'import requests
url = "https://api.promptguard.co/api/v1/chat/completions"
payload = {
"model": "<string>",
"messages": [{}],
"stream": True,
"fallback_models": ["<string>"]
}
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({model: '<string>', messages: [{}], stream: true, fallback_models: ['<string>']})
};
fetch('https://api.promptguard.co/api/v1/chat/completions', 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.promptguard.co/api/v1/chat/completions",
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([
'model' => '<string>',
'messages' => [
[
]
],
'stream' => true,
'fallback_models' => [
'<string>'
]
]),
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.promptguard.co/api/v1/chat/completions"
payload := strings.NewReader("{\n \"model\": \"<string>\",\n \"messages\": [\n {}\n ],\n \"stream\": true,\n \"fallback_models\": [\n \"<string>\"\n ]\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.promptguard.co/api/v1/chat/completions")
.header("X-API-Key", "<api-key>")
.header("Content-Type", "application/json")
.body("{\n \"model\": \"<string>\",\n \"messages\": [\n {}\n ],\n \"stream\": true,\n \"fallback_models\": [\n \"<string>\"\n ]\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.promptguard.co/api/v1/chat/completions")
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 \"model\": \"<string>\",\n \"messages\": [\n {}\n ],\n \"stream\": true,\n \"fallback_models\": [\n \"<string>\"\n ]\n}"
response = http.request(request)
puts response.read_body{
"id": "chatcmpl-Ef5ekglmKoFkUSKUMWYOZPXC5peNv",
"object": "chat.completion",
"created": 1793461898,
"model": "gpt-5-nano-2025-08-07",
"choices": [
{
"index": 0,
"message": {
"role": "assistant",
"content": "Paris",
"refusal": null,
"annotations": []
},
"finish_reason": "stop"
}
],
"usage": {
"prompt_tokens": 18,
"completion_tokens": 138,
"total_tokens": 156
},
"service_tier": "default",
"system_fingerprint": null
}Authorizations
PromptGuard API key for developer endpoints. Keys start with pg_live_ and are created in the dashboard.
Headers
Body
application/json
An OpenAI chat completion request: the fields PromptGuard reads.
Everything else OpenAI accepts (temperature, tools, ...) is forwarded untouched, so it is allowed rather than named.
Models to try, in order, when model fails with a retryable error. Removed before forwarding. Replaces a matching routing rule's chain. A stream falls back only before its first byte. See https://docs.promptguard.co/gateway/fallback-models
Maximum array length:
3