Sample data. Not a customer bill.

Hosted Quickstart wizard

Planned

For startups: project, pz_ key, provider keys, one-line base URL change and a test request.

View

Hosted gateway

$ npm install openai
installed openai
$ import OpenAI from "openai";
$ 
$ const client = new OpenAI({
$   baseURL: "https://api.parezen.com/v1",
$   apiKey: process.env.PAREZEN_API_KEY, // pz_ key. Project and environment come from this key.
$   defaultHeaders: {
$     "X-Parezen-Route": "support-reply",
$     "X-Parezen-Task": "ticket_resolved",
$   },
$ });
$ 
$ await client.chat.completions.create({
$   model: "anthropic/claude-sonnet-4.5",
$   messages: [{ role: "user", content: "Summarise the latest customer ticket." }],
$ });
200 · first request · metadata only

Hosted Quickstart for startups

Test Parezen by changing one line: point the OpenAI SDK at https://api.parezen.com/v1 with a pz_ key. Parezen runs the gateway, you bring your own provider keys, and there is no token markup. A free trial, then a paid add-on priced above running the gateway yourself. You can move to your own gateway later without losing policies or savings history. Not live yet: it opens once encrypted key storage, TLS on every hop and rate limiting ship.

Project

Existing projects: Support bot, Inbox copilot, Eval lab.

If Parezen is unavailable

Example only

Node

// Example only. Bypassed calls are not routed, recorded or budget-checked. Do not bypass a budget hard stop.
import OpenAI from "openai";

const viaParezen = new OpenAI({
  baseURL: "https://api.parezen.com/v1",
  apiKey: process.env.PAREZEN_API_KEY,
  timeout: 10_000,
  maxRetries: 0,
});
const direct = new OpenAI({ apiKey: process.env.OPENAI_API_KEY });

export async function chat(params) {
  try {
    return await viaParezen.chat.completions.create(params);
  } catch (err) {
    const parezenDown = err instanceof OpenAI.APIConnectionError || (err.status ?? 0) >= 500;
    if (!parezenDown) throw err; // a 4xx, including a budget hard stop, must not be bypassed
    return direct.chat.completions.create(params);
  }
}

Python

# Example only. Bypassed calls are not routed, recorded or budget-checked. Do not bypass a budget hard stop.
import os
import openai
from openai import OpenAI

via_parezen = OpenAI(
    base_url="https://api.parezen.com/v1",
    api_key=os.environ["PAREZEN_API_KEY"],
    timeout=10,
    max_retries=0,
)
direct = OpenAI(api_key=os.environ["OPENAI_API_KEY"])

def chat(**params):
    try:
        return via_parezen.chat.completions.create(**params)
    except (openai.APIConnectionError, openai.InternalServerError):
        return direct.chat.completions.create(**params)

Example only. Bypassed calls are not routed, recorded in the ledger or budget-checked. Do not bypass a 4xx. A budget hard stop must hold. Billing never returns an error on production traffic.

$ npm install openai installed openai $ import OpenAI from "openai"; $ $ const client = new OpenAI({ $ baseURL: "https://api.parezen.com/v1", $ apiKey: process.env.PAREZEN_API_KEY, // pz_ key. Project and environment come from this key. $ defaultHeaders: { $ "X-Parezen-Route": "support-reply", $ "X-Parezen-Task": "ticket_resolved", $ }, $ }); $ $ await client.chat.completions.create({ $ model: "anthropic/claude-sonnet-4.5", $ messages: [{ role: "user", content: "Summarise the latest customer ticket." }], $ }); 200 · first request · metadata only

If Parezen is unavailable

Example only

Node

// Example only. Bypassed calls are not routed, recorded or budget-checked. Do not bypass a budget hard stop.
import OpenAI from "openai";

const viaParezen = new OpenAI({
  baseURL: "https://api.parezen.com/v1",
  apiKey: process.env.PAREZEN_API_KEY,
  timeout: 10_000,
  maxRetries: 0,
});
const direct = new OpenAI({ apiKey: process.env.OPENAI_API_KEY });

export async function chat(params) {
  try {
    return await viaParezen.chat.completions.create(params);
  } catch (err) {
    const parezenDown = err instanceof OpenAI.APIConnectionError || (err.status ?? 0) >= 500;
    if (!parezenDown) throw err; // a 4xx, including a budget hard stop, must not be bypassed
    return direct.chat.completions.create(params);
  }
}

Python

# Example only. Bypassed calls are not routed, recorded or budget-checked. Do not bypass a budget hard stop.
import os
import openai
from openai import OpenAI

via_parezen = OpenAI(
    base_url="https://api.parezen.com/v1",
    api_key=os.environ["PAREZEN_API_KEY"],
    timeout=10,
    max_retries=0,
)
direct = OpenAI(api_key=os.environ["OPENAI_API_KEY"])

def chat(**params):
    try:
        return via_parezen.chat.completions.create(**params)
    except (openai.APIConnectionError, openai.InternalServerError):
        return direct.chat.completions.create(**params)

Example only. Bypassed calls are not routed, recorded in the ledger or budget-checked. Do not bypass a 4xx. A budget hard stop must hold. Billing never returns an error on production traffic.