# GET /op_return
**Search OP_RETURN data**

Search Bitcoin transactions by their OP_RETURN payload. Returns matching transactions with their transaction ID, timestamp, and embedded data.

## Query Parameters
- `q` — string (required): Search string to match against OP_RETURN data.
- `limit` — integer, default: 200 (optional): Maximum number of results to return.

## Responses
- 200: Matching transactions
  - `response` (array)
- 400: Invalid query (too short or limit out of range)
  - `message` (string)

Full reference: https://developers.blockonomics.co/docs/search/searchopreturn