Orbacle lets a contract on Robinhood Chain ask a question in plain language and get a typed answer back on chain. The fee is Orbio CREDIT, the token that burns into a dollar of model usage, and the operators who answer are paid in it. Resolve a dispute, grade a deliverable, classify a submission, pick an option: the things a contract could never decide alone.
Orbacle is built on Orbio’s public contracts and gateway and is not affiliated with Orbio. Nothing here has been audited. Each claim on this site says which of those it is.
Capabilities
Six properties, and every one of them is a line you can find in the contract.
ask() takes a model id, a prompt, the shape of answer you want and a fee. The prompt is emitted, never stored, so the question costs the same whether it is one line or eight kilobytes.
One call · Any model on Orbio · 8 KB promptsThe fee is Orbio CREDIT: the ERC-20 that burns into a dollar of model usage. The operator who answers is paid in the very thing it spent to answer, so the loop closes without a treasury.
CREDIT escrow · 0.01 minimum · Refund on silenceBool is one byte. Uint is thirty-two. Choice is an index. Text is UTF-8 up to two kilobytes. The contract checks the shape on the way in, so onAnswer never sees a malformed reply.
Bool · Uint · Choice · TextFor typed questions you name one, two or three operators. The first digest to reach a majority settles the request. Three answers that all disagree refund you, and nobody is paid.
Quorum 1–3 · Majority wins · Dissent earns nothingAnyone bonding $ORBACLE above the minimum may answer any request. There is no allowlist to get on and no address that can take you off it; unbonding is a day, so a bad actor cannot leave in the same block.
Permissionless · Bonded · One-day unbondA reply names the model that actually answered and the hash of the gateway response id. Anyone with an Orbio key can ask the gateway what that call was: the oracle does not ask you to trust the operator.
Model named · Receipt hashed · CheckableHow it works
Ask and Reply are transactions. Infer happens on Orbio’s gateway. Callback is the same transaction as the settling reply.
Your contract calls ask() with a model, a prompt, an answer shape, a quorum and a fee in CREDIT. The fee is escrowed; the prompt goes out in the log.
Operators watching the log run the prompt through the Orbio gateway, each on its own key, each paying for its own tokens. Nothing about this step touches the chain.
Each operator writes its answer back with reply(), typed to the shape you asked for. The contract tallies digests; a majority settles it and pays the winners.
If you named callback gas, the oracle calls your onAnswer() in the same transaction. If you did not, the answer waits in storage for you to read.
Trust model
An oracle is a claim about the world written into a chain. This one is honest about where each part of that claim comes from.
What the contract guarantees
What it cannot guarantee
The honest summary: Orbacle moves the question of “do I trust this model’s answer” from a private API key to a public, staked, receipted reply that a contract can act on. That is a smaller claim than “decentralised truth”, and it is the one the code supports.
Why CREDIT
Orbio turned inference into an ERC-20. That is the one thing that lets an oracle pay its operators in what they actually spend.
One CREDIT is one dollar of model usage through Orbio’s gateway. It trades on an order book below par, because the people who earned it by staking do not all need to spend it. Activating it burns the token into API balance, one way.
An Orbacle operator is paid in CREDIT, holds CREDIT, and activates CREDIT to run the next question. Its wallet signature is its Orbio API key, so there is no account to open and no card on file. The node refuels itself from its own earnings. An oracle priced in a currency needs a treasury to buy compute; an oracle priced in compute does not.
It also means the price of an answer is public. The plate above shows what a dollar of inference costs on the book right now, read from the Exchange contract by your own browser. An asker can see what it is paying for; an operator can see whether a fee clears its cost before it spends a token.
CREDIT, the Exchange, the gateway and the models behind it are Orbio’s. Orbacle uses them as any agent would, through the public ABI and the public API. If Orbio changes its terms, every operator here feels it, and this page will say so.
What to ask it
Every one of these is a typed request with a quorum, not a chat.
Bool · quorum 3
Uint · quorum 3
Choice · quorum 2
Askers need CREDIT and a question. Operators need $ORBACLE to bond and a wallet that signs once for an Orbio key. Both start from the same page.