# Signing & Streams

> The few Ora API flows your own wallet signs, and how to read live data streams.

### Transactions you sign

Most on-chain actions run entirely on Ora's side, with the wallets Ora manages for your token: launches, buys, sells, nukes, burns, locks, strategies and reward claims. Your script never touches a private key for those.

A few flows move money *from your own wallet*, so they return transactions for that wallet to sign:

| Flow | Build | Then |
|---|---|---|
| Fund a launch | `POST /engine/fund` | Sign, send, then `POST /engine/fund/confirm` |
| Cancel a launch | `POST /engine/cancel` | `POST /engine/cancel/submit` with the signed transactions |
| Collect proceeds | `POST /engine/collect` | `POST /engine/collect/submit` with the signed transactions |
| Buy aged wallets | `POST /portfolio/marketplace/quote` | `POST /portfolio/marketplace/buy` with the signed deposits |

To run these headless, your script needs that wallet's key. With the embedded wallet created when you signed up, sign them in the app instead.

### Real-time streams

Live data comes as Server-Sent Events. Browsers' `EventSource` can't send headers, so read streams with `fetch`, from your server, script or extension:

```js title="stream.mjs"
const res = await fetch(`https://api.useora.xyz/engine/tokens/${mint}/stream`, {
  headers: { Authorization: `Bearer ${process.env.ORA_API_KEY}`, Accept: 'text/event-stream' },
});
const reader = res.body.pipeThrough(new TextDecoderStream()).getReader();
let buf = '';
for (;;) {
  const { value, done } = await reader.read();
  if (done) break; // reconnect with backoff
  buf += value;
  for (let i; (i = buf.indexOf('\n\n')) >= 0; buf = buf.slice(i + 2)) {
    const frame = buf.slice(0, i); // "event: …" and "data: {…}" lines
    console.log(frame);
  }
}
```

Each open stream counts as one request in your [rate limit](https://docs.useora.xyz/developers/requests-and-errors/#rate-limits).

| Stream | Carries |
|---|---|
| `/engine/tokens/{mint}/stream` | One token on one connection: a `snapshot` then state events, `trades_snapshot` then each `trade`, the known wallets holding the token, and holder stats. |
| `/user/tracked-wallets/trades/stream` | Live trades of the wallets you track. |
| `/sol-usd/events` | SOL/USD price. |
| `/blockhash/events` | Latest blockhash and block height, about every 220 ms. |
| `/jito/tip-lamports/events` | Jito tip floor percentiles. |
| `/jito/tip-accounts/events` | Jito tip account list. |