# Submit a Swap

Use this flow after `POST /quote`. The SDK exposes these methods:

* Layer-based: `sdk.swap.build`, `sdk.swap.getSigning`, `sdk.swap.submitSigning`
* Flat: `sdk.buildSwap`, `sdk.getSwapSigning`, `sdk.submitSwapSigning`

***

### Build swap

#### `build`

Calls `POST /swap/build`.

**Parameters**

* `body` (SwapBuildRequest, required)
  * `quoteId` (string, required)
  * `routeId` (string, required)
  * `recipient` (string, required)
  * `waitForTxRequestMs` (number, optional)

**Returns**

A Promise that resolves to `SwapBuildResponse`.

* `data.swapId` (string)
* `data.mode` (`"sync"` or `"async"`)
* `data.nextAction` (`"sign"` or `"poll"`)
* `data.pollAfterMs` (number, optional)
* `data.signing` (signing payload + hints)
* `meta.requestId` (string): Request identifier.
* `meta.timestamp` (string): Response timestamp.

***

### Get signing status

#### `getSigning`

Calls `GET /swap/{swapId}/signing`.

**Parameters**

* `swapId` (string, required)

**Returns**

A Promise that resolves to `SwapSigningResponse` with the same top-level shape as build (`swapId`, `mode`, `nextAction`, `pollAfterMs`, `signing`).

***

### Submit signed artifact

#### `submitSigning`

Calls `POST /swap/{swapId}/signing`.

**Parameters**

* `swapId` (string, required)
* `body` (SwapSubmitSigningRequest, required)
  * `rawTx` (string, required): Signed transaction artifact.

**Returns**

A Promise that resolves to `SwapSigningResponse` (typically `nextAction: "poll"` while next step is preparing).

```typescript
import { RoutingEngineSDK } from 'routing-engine-sdk';

const sdk = new RoutingEngineSDK({
  api: { apiKey: 'your-api-key' },
});

try {
  const quote = await sdk.quote.request({
    fromChain: 'arbitrum',
    toChain: 'avax',
    tokenIn: 'TBTC',
    tokenOut: 'WETH',
    network: 'mainnet',
    amount: '100.00',
    slippageBps: 75,
    recipient: '0x1234567890123456789012345678901234567890',
  });

  const build = await sdk.swap.build({
    quoteId: quote.data.quoteId,
    routeId: quote.data.routes[0].routeId,
    recipient: '0x1234567890123456789012345678901234567890',
  });

  const signing = await sdk.swap.getSigning(build.data.swapId);
  if (signing.data.nextAction === 'sign') {
    // Sign with wallet/signer, then submit the signed raw transaction.
    await sdk.swap.submitSigning(build.data.swapId, { rawTx: '0xsigned_raw_tx' });
  }
} catch (error) {
  console.error(error);
}
```


---

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