Last updated: 2026-04-12

OpenAI Integration

Route OpenAI API calls through SpendLil for spend tracking.

SpendLil works with all OpenAI API endpoints. Swap api.openai.com for openai.gateway.spendlil.ai and pass your key via X-Provider-Key.

URL Pattern

diff Before → After 
- POST https://api.openai.com/v1/chat/completions
+ POST https://openai.gateway.spendlil.ai/v1/chat/completions

Supported Endpoints

  • /v1/chat/completions — Chat models (GPT-4o, GPT-4o-mini, o1, o3-mini)
  • /v1/embeddings — Embedding models
  • /v1/images/generations — DALL-E
  • /v1/audio/transcriptions — Whisper
  • /v1/moderations — Content moderation

Node.js

javascript Using fetch 
const response = await fetch(
  'https://openai.gateway.spendlil.ai/v1/chat/completions',
  {
    method: 'POST',
    headers: {
      'X-SpendLil-Key': process.env.SPENDLIL_KEY,
      'X-Provider-Key': `Bearer ${process.env.OPENAI_API_KEY}`,
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({
      model: 'gpt-4o',
      messages: [
        { role: 'system', content: 'You are a helpful assistant.' },
        { role: 'user', content: 'What is SpendLil?' },
      ],
    }),
  }
);

const data = await response.json();
console.log(data.choices[0].message.content);

Python

python Using requests 
import os
import requests

response = requests.post(
    "https://openai.gateway.spendlil.ai/v1/chat/completions",
    headers={
        "X-SpendLil-Key": os.environ["SPENDLIL_KEY"],
        "X-Provider-Key": f"Bearer {os.environ['OPENAI_API_KEY']}",
        "Content-Type": "application/json",
    },
    json={
        "model": "gpt-4o",
        "messages": [
            {"role": "system", "content": "You are a helpful assistant."},
            {"role": "user", "content": "What is SpendLil?"},
        ],
    },
)

data = response.json()
print(data["choices"][0]["message"]["content"])

Cost Tracking

SpendLil extracts prompt_tokens and completion_tokens from OpenAI's response.usage object and calculates cost using current model pricing.

ModelInput (per 1M tokens)Output (per 1M tokens)
gpt-4o$2.50$10.00
gpt-4o-mini$0.15$0.60
o1$15.00$60.00
o3-mini$1.10$4.40
ℹ Key safety

SpendLil never stores your OpenAI API key. It passes through via X-Provider-Key directly to OpenAI. We store only a SHA-256 hash for identification and the last 4 characters as a visual hint in your dashboard.