Today You pay for their tokens

• You eat unpredictable inference costs every month.
• Your price = margin + a budget you guessed each user would burn.
• Power users wreck your unit economics; free tiers bleed.
• Side projects need a credit card you're scared to attach.

With Wattfare They bring their own budget

• Inference is funded by the user, within a cap they set.
• You charge for the product — your margin, nothing padded.
• Power users fund themselves. Free tiers cost you nothing.
• Ship anything. The worst case is their budget, not your bill.

Monthly active users 1,000 Usage profile

feat: let users bring their own AI budget +9 −1

1Drop in the button frontend · +4

@@ main.tsx @@+ <WattfareProvider publishableKey="pk_live_…" session={getToken}>    <App />+ </WattfareProvider>@@ chat.tsx @@  const ai = useChat();+ const { connect, connected } = useWattfare();+ if (!connected) return <button onClick={connect}>Connect AI budget</button>;

2Mint sessions server · +4

+ const wf = new Wattfare({ secretKey: process.env.WATTFARE_SECRET_KEY });+ app.post("/api/ai-session", (c) =>+   c.json(wf.createSession(c.var.userId, { requestLimit: { monthlyUsd: 10 } }))+ );

3Swap the model chat route · +1 −1

  const result = streamText({-   model: openai("gpt-4o"),                                    // billed to: you+   model: wf.user(userId).model("anthropic/claude-sonnet-4"),  // billed to: them    prompt,  });  // the deleted line is the one where you were paying.

01 Publishable key in the browser. The secret key stays on your server and mints short-lived session tokens.

02 Consent happens on Wattfare's domain — a popup, a cap, ~30s. State lives with us, keyed by your existing user ids.

03 The returned model is AI-SDK-compatible. Stream like you already do — every token metered against their cap.

Inference is funded by the person using it. Your AI line item drops toward zero, and margins stop fighting compute.

the budget

One budget covers every connected app — no more paying five different markups for the same tokens.

Your worst case is their cap, never your card. The front page of HN stops being a financial event.

the cap

You pick a monthly number. It's enforced upstream — requests stop at your cap, not at an honor system.

No provider keys to collect, encrypt, rotate, or leak. Connection state lives on Wattfare, keyed by your user ids.

the key

You never paste a raw API key into a stranger's app. Consent happens on Wattfare's domain, like OAuth.

Disconnects surface as typed errors — the not-connected path is a normal flow state, not a 3am page.

the switch

Revoke any app in one click. The spending stops immediately, for that app only.

One SDK, hundreds of models, AI-SDK native. Same code in dev and prod — test keys auto-approve.

the models

Your prompts proxy straight through to the model. Wattfare meters cost; it isn't where conversations live.

Freemium that costs you nothing — give the whole product away and let usage fund itself.

the free tier

Try new AI apps in 30 seconds without a new account, card, or subscription each time.