> For the complete documentation index, see [llms.txt](https://docs.ethgas.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ethgas.com/orderflow/originators.md).

# Originators

Originators send signed transactions through the public or partner RPC endpoint.

To request an originator account or a refund-read-only subaccount, contact us at <info@ethgas.com>.

| Access  | Endpoint                                               |
| ------- | ------------------------------------------------------ |
| Public  | `https://originator.orderflow.ethgas.com/v1`           |
| Partner | `https://originator.orderflow.ethgas.com/v1/{API_KEY}` |

## Send a transaction

The engine supports these equivalent methods:

* `eth_sendRawTransaction` with `params: ["0x..."]`
* `eth_sendPrivateRawTransaction` with `params: ["0x..."]`
* `eth_sendPrivateTransaction` with `params: [{"tx":"0x..."}]`

Each returns the ordinary Ethereum transaction hash.

## Send a bundle

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "eth_sendBundle",
  "params": [{
    "txs": ["0x<SIGNED_TX_1>", "0x<SIGNED_TX_2>"],
    "blockNumber": "0x12abcde",
    "refundPercent": 90,
    "refundRecipient": "0x1111111111111111111111111111111111111111"
  }]
}
```

`txs` must contain signed transaction(s). `blockNumber` and both refund fields are optional. If the target block has already passed, the request is rejected. `refundPercent` and `refundRecipient` are optional. The default values are 90% and the sender of the bundle's first transaction respectively.

The result contains the engine's local identity:

```json
{"jsonrpc":"2.0","id":1,"result":{"bundleHash":"0x..."}}
```

## Refund override

Any originator method can use a query override:

```
?refund=0x1111111111111111111111111111111111111111:75
```

The query value takes precedence over bundle-body refund fields. Percentages outside the deployment's configured range fall back to the configured default; malformed values are rejected.

Without an override, the configured default percentage and the first transaction's recovered sender are used.

## Bundle references

The last transaction in originator orderflow is its shareable reference. Searchers receive the full decoded transaction list and use that last hash to reference the flow. During builder forwarding, the engine replaces the reference with every original signed transaction in order.


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