> ## Documentation Index
> Fetch the complete documentation index at: https://docs.thornode.io/llms.txt
> Use this file to discover all available pages before exploring further.

# sendTransaction

> Submit one signed transaction through a Hofund fast rail or through Jito.

`sendTransaction` submits one transaction. On `/hofund` you choose the lane per request; on a lane route the URL fixes it.

| Route                      | Rail                                                                                              | Options accepted                                                        |
| -------------------------- | ------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------- |
| `/hofund`                  | Fast (both rails); `?swqos-only=true` for SWQoS only; `?mev-protect=true` or `params[2]` for Jito | Fast option set below; Jito accepts only `encoding` and `skipPreflight` |
| `/hofund-fast`             | Direct TPU and SWQoS at once; the first verified acknowledgement wins                             | Fast option set                                                         |
| `/hofund-direct-tpu`       | Direct TPU only                                                                                   | Fast option set                                                         |
| `/hofund-swqos`            | SWQoS only                                                                                        | Fast option set                                                         |
| `/hofund-jito-bundle-only` | Jito, bundle-only, no fallback                                                                    | Exactly `{ "encoding": "base64", "skipPreflight": true }`               |

The transaction must pay the Thor tip floor to a Thor tip account (fast rails), and additionally the Jito tip floor to a Jito tip account (protected). Read both sets from [`getFastTipConfig` and `getThorTipConfig`](/api-reference/hofund/status-and-tips).

## Parameters

<ParamField body="params[0]" type="string" required>
  Fully signed transaction, canonical padded base64, at most 1232 bytes decoded.
</ParamField>

<ParamField body="params[1]" type="object" required>
  Send configuration.

  <Expandable title="properties">
    <ParamField body="encoding" type="string" required>Must be `"base64"`.</ParamField>
    <ParamField body="skipPreflight" type="boolean" required>Must be `true`. Hofund does not simulate.</ParamField>
    <ParamField body="maxRetries" type="integer">Fast rails only. `0`–`5`, forwarded to the rail.</ParamField>
    <ParamField body="preflightCommitment" type="string">Fast rails only. `processed`, `confirmed`, or `finalized`; accepted for SDK compatibility, has no effect.</ParamField>
    <ParamField body="deadlineMs" type="integer">Fast rails only. Bounds the whole dispatch, from `100` up to the maximum reported by `getFastTipConfig`.</ParamField>
    <ParamField body="region" type="string">Fast rails only. `"auto"` or the exact region reported by `getFastTipConfig`; fails closed if it does not match the instance you reached.</ParamField>
  </Expandable>

  `minContextSlot` is rejected: `-32602 minContextSlot is unsupported and is not enforced by Hofund sender rails`.
</ParamField>

<ParamField body="params[2]" type="object">
  `/hofund` only. Exactly `{ "mevProtect": true }` routes the transaction through Jito instead of the fast rails. Do not combine with `?mev-protect=true`.
</ParamField>

On the lane routes `/hofund-fast`, `/hofund-direct-tpu`, and `/hofund-swqos` you can send `deadlineMs` and `region` as headers instead: `Hofund-Deadline-Ms` and `Hofund-Expected-Region`. Sending both the header and the body field is rejected.

## Response

<ResponseField name="result" type="string">
  The transaction signature, once one selected rail returned a verified acknowledgement (fast) or Jito accepted the transaction (protected).
</ResponseField>

Headers: `X-Hofund-Submission-ID`; `X-Bundle-ID` on the Jito path.

Acknowledged is not landed. Track the signature through [ThorEdge RPC](/api-reference/thoredge-rpc/http-methods), or poll [`getHofundSubmissionStatus`](/api-reference/hofund/status-and-tips) with the submission id.

## Errors

| HTTP  | Code     | Message                                                        | Meaning                                                                   |
| ----- | -------- | -------------------------------------------------------------- | ------------------------------------------------------------------------- |
| `200` | `-32602` | `Thor tip is below the configured floor`                       | No qualifying tip transfer, or too small.                                 |
| `200` | `-32602` | `transaction must pay at least N Thor and M Jito tip lamports` | Protected path tip check failed.                                          |
| `200` | `-32006` | `transaction rejected by all selected rails`                   | Every rail returned a deterministic rejection.                            |
| `200` | `-32007` | `transaction outcome is ambiguous`                             | A rail timed out or answered malformed. Check status before resubmitting. |
| `409` | `-32005` | `transaction signature is already reserved`                    | Same signature already submitted, possibly on another lane.               |
| `429` | `-32003` | `fast submission rate limit exceeded`                          | Retry after `Retry-After`. All fast lanes share one limiter.              |

<RequestExample>
  ```bash /hofund (fast) theme={null}
  curl --fail-with-body "$HOFUND_URL" \
    --header 'content-type: application/json' \
    --data '{
      "jsonrpc": "2.0",
      "id": 1,
      "method": "sendTransaction",
      "params": [
        "<BASE64_SIGNED_TRANSACTION>",
        { "encoding": "base64", "skipPreflight": true, "maxRetries": 0 }
      ]
    }'
  ```

  ```bash /hofund (protected) theme={null}
  curl --fail-with-body "$HOFUND_URL" \
    --header 'content-type: application/json' \
    --data '{
      "jsonrpc": "2.0",
      "id": 1,
      "method": "sendTransaction",
      "params": [
        "<BASE64_SIGNED_TRANSACTION>",
        { "encoding": "base64", "skipPreflight": true },
        { "mevProtect": true }
      ]
    }'
  ```

  ```bash /hofund-jito-bundle-only theme={null}
  curl --fail-with-body "$HOFUND_JITO_BUNDLE_ONLY_URL" \
    --header 'content-type: application/json' \
    --data '{
      "jsonrpc": "2.0",
      "id": 1,
      "method": "sendTransaction",
      "params": [
        "<BASE64_SIGNED_TRANSACTION>",
        { "encoding": "base64", "skipPreflight": true }
      ]
    }'
  ```
</RequestExample>

<ResponseExample>
  ```json Response theme={null}
  { "jsonrpc": "2.0", "id": 1, "result": "<TRANSACTION_SIGNATURE>" }
  ```

  ```json Rejected theme={null}
  {
    "jsonrpc": "2.0",
    "id": 1,
    "error": {
      "code": -32602,
      "message": "Thor tip is below the configured floor",
      "data": { "kind": "tip_too_low" }
    }
  }
  ```
</ResponseExample>