heumpa heumpa docs
One OpenAI-compatible key. Each call goes to the healthy seller with the deepest discount. You sign in with an Ethereum-style wallet on Robinhood Chain.
Beta
heumpa targets Robinhood Chain mainnet (chain id 4663) and takes payment in USDG. The HEUMPA token is live and the product is in beta; nothing has been audited. The API address is https://api.useheumpa.fun/v1 and answers today, with models from heumpa's own supply and one outside-style seller behind it. No outside seller has joined yet, so only add a balance you are happy to spend while it is in beta.
Three ways in
Buy with a key
Prepaid balance, one API key, any OpenAI SDK.
Pay per request
No account. An agent pays one request in USDG.
Sell capacity
List an OpenAI-compatible endpoint at a discount.
What works today
| Area | Status | Evidence |
|---|---|---|
| Wallet sign-in, API keys, spend caps | Working in tests | EIP-191 signatures, single-use nonce, key shown once |
| Price routing and failover | Working in tests | Deepest discount wins; a dead seller is skipped and switched off |
| Seller discount passed to the buyer | Working in tests | 40% off bills 60% of list; 80% off bills 20% |
| Playground | Working | Free models: a few free messages every 4 hours, paid by heumpa. Premium models (Claude Opus, the top GPT models and similar): locked until your balance is above zero, then billed to your balance |
| USDG top-up | Working on mainnet | A real USDG top-up on Robinhood Chain was credited; wrong payer and double claim are rejected |
| Staking | Coming soon | Not live yet. It ships with the heumpa token, after an independent audit. See the staking section below |
| x402 pay per request | Working on mainnet | One scheme (transfer-receipt) on Robinhood Chain: you send a USDG transfer, the server reads the receipt. No facilitator. A real payment was accepted; replay and tampering are refused |
| Real seller supply | Started | heumpa's own supply covers 32 models at 15% below list, and one DeepSeek seller sits 20% below list. Open to others through Sell |
| API address | Reachable | https://api.useheumpa.fun/v1 (OpenAI) and https://api.useheumpa.fun (Anthropic). Needs a key with balance. Models come from heumpa's own supply plus one seller |
| Independent audit | Not yet | Nothing here has been audited |
Where to go next
- Quickstart — Your first call in five steps.
- How it works — Routing, pricing, billing and failover.
- API reference — Every endpoint, request and response.
- Security and trust — What is protected, and what is not yet.