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

# POST /v1/trade

> Report an Ostium trading transaction hash to the Builder API for SDK usage attribution.

The SDK sends this request in the background after any successful submission that targets the Ostium Trading contract.

```bash theme={null}
curl https://builder.prod.bedrock.ostium.io/v1/trade \
  -H 'Content-Type: application/json' \
  -d '{
    "hash": "0xTransactionHash"
  }'
```

## Request schema

```ts theme={null}
interface Request {
  hash: `0x${string}`;
}
```

## SDK behavior

`OstiumClient` sends this as a fire-and-forget attribution request. The SDK does not wait for the response, does not inspect the response body, and swallows failures so attribution can never block or change trading behavior.