Wind API

Build AI apps that
bill themselves.

Wind is a metered billing gateway for AI. Drop it in between your app and any AI provider — users pay from their Wind wallet per request. No Stripe, no invoices, no balance tracking.

Get started

Follow the quickstart to make your first billable AI request in 15 minutes.

Quickstart guide

Create an API key

Generate a sk_live_ key to authenticate requests from your server.

API Keys

Create a feature

Define pricing rules for each AI feature in your app — per call or per token.

Features guide

How it works

User funds a wallet

Your user tops up a Wind wallet with credits once via Stripe. No recurring billing needed.

Your app calls Wind

You POST to /v1/chat/completions with the user's wallet ID. Wind bills the wallet and calls the AI.

You earn on every call

Wind takes a small platform fee and credits your developer balance for the rest.

Quick reference

Base URL

https://wind-production-3225.up.railway.app

Auth header

Bearer sk_live_...

Request format

OpenAI-compatible

shell

curl https://wind-production-3225.up.railway.app/v1/chat/completions \
  -H "Authorization: Bearer sk_live_..." \
  -H "Content-Type: application/json" \
  -d '{
    "feature_id": "chat",
    "model": "google/gemini-2.5-flash",
    "windUserId": "<user-wallet-id>",
    "messages": [{ "role": "user", "content": "Hello!" }]
  }'

Build AI apps thatbill themselves.