# Intents - How orders work

Most centralized exchanges work like this: you send the exchange a plaintext request like "buy 100 BTC at $60k", the exchange matches it, and you trust them. If they go rogue, you have no recourse.

MoveX uses **signed intents** instead. Every order you place is a structured message that you sign with your wallet, and that signature is verified on-chain before any settlement happens.

#### What's in an intent?

```
TradeIntent {
  trader:      0xYourAddress
  market:      0xBTC_MOVE_WEEKLY_address
  isBuy:       true
  maxSize:     1.25  ← max contracts you're willing to take
  priceLimit:  $2,500 ← worst price you'll accept
  collateral:  $150  ← how much margin you're committing
  leverage:    2.00x
  deadline:    timestamp after which this expires
  nonce:       monotonic counter to prevent replay
}
```

You sign this with EIP-712, which produces a 65-byte signature. The intent + signature travels to the sequencer, which forwards it to `BatchSettler.batchSettle()` on-chain.

#### What the contract guarantees

When the on-chain `Market.settleTrade` runs against your intent, the contract verifies:

* **Your signature is valid** and matches the intent's `trader` address.
* **The nonce hasn't been used before** (anti-replay).
* **The deadline hasn't passed**.
* **The fill price respects your `priceLimit`** - buys can't be settled above the limit, sells can't be settled below.
* **The fill size respects your `maxSize`** - at the fill price, the implied size is within what your collateral and leverage support.

If any of these checks fail, the entire settlement reverts. **You cannot be filled on terms you didn't sign.**

#### Why intents are powerful

1. **No trust required.** The sequencer can't make up fills. Whatever settles on-chain is provably what you authorized.
2. **No custody.** Your collateral never leaves the Hub contract except via a signed deposit/withdrawal you authorized.
3. **Atomic batches.** Multiple intents settle together or not at all - no half-finished trades.
4. **Predictable risk.** You know exactly the worst execution you can get, because you signed the limits yourself.

***


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