HFAI Cloud — HeartFlowAI

HeartFlow Cloud

Use AI. Pay with $HFAI. Build anything.

Chat with leading AI models or use HFAI Cloud through an OpenAI-compatible API. Sign in with your Solana wallet. No email. No subscription.

$HFAITop up with HFAI tokens via Solana Pay
CreditsGet API credits instantly
AI ModelsChat or use the API in your own apps

Read the docs

Why HFAI Cloud?

Everything you need to ship with frontier models — no key management, no markup.

Sign in with Solana

No email, no password. Your keys stay on your device.

Pay with $HFAI

Prepaid credits at a USD peg. Buy $10 in $HFAI, get $10 in credits.

Pass-through pricing

No markup, no tiers, no discounts — you pay the model's cost.

Six frontier models

One endpoint, one API key, one balance.

Frontier models. One API.

Access six frontier models through a single OpenAI-compatible endpoint.

DeepSeek V4.1 Flash Chat

GPT-OSS 120B Chat

GPT-OSS 20B Chat

Gemma 4 Chat

GLM 5.3 Flash Chat

MiniMax M3 Chat

MODEL

WAIFU

~0 / 200k tokens

Chat free on GPT-OSS 120B. Sign in and add credits to unlock every model.

Models

Every model is served through the same OpenAI-compatible endpoint. Wallet price is the discounted rate you pay from prepaid credits.

Model catalogue and pricing
Model	Context	List in / out	HFAI in / out	Save

API keys

Use these with any OpenAI-compatible client. They proxy HFAI Cloud's models — your provider keys are never exposed. Shown once, stored only as a hash.

YOUR KEYS

Create keys that proxy HFAI Cloud's models. Usage is deducted from your credits.

Your API keys
Name	Key	Created	Last used	Actions

HFAI Cloud APIhttps://<your-worker>.workers.dev/v1

Usage

Metered per request and deducted from your prepaid credits.

Credits spent

Last 14 days.

Credits

Top up with $HFAI via Solana Pay. Usage is metered per request and deducted from your balance.

Current balance$0.00

custom

Choose a USD amount; you'll pay the equivalent in $HFAI from any Solana wallet.

API reference

HFAI Cloud speaks the OpenAI chat-completions shape, so existing SDKs work by changing the base URL and key. Full docs ↗

Endpoints

`POST /v1/chat/completions`	Streaming chat, OpenAI-compatible
`GET /v1/models`	Model catalogue and wallet pricing
`POST /auth/nonce`	Start Sign-In With Solana
`POST /auth/verify`	Verify the wallet signature
`GET /me`	Wallet and credit balance
`GET /keys` · `POST /keys`	List and create API keys
`POST /billing/topup` · `POST /billing/verify`	Solana Pay top-ups

Full documentation lives in the HFAI Cloud docs.