GET
/v2/rest-protocol.proto Download the REST protobuf schema
stream_getRestProtocolProto
The .proto file for the protobuf response bodies served with Accept: application/x-protobuf. Plain text, no authentication required.
Details
Operations that offer protobuf say so in their description, for example GET /v2/gex/{symbol}/grid.
Response
Prices are dollars, timestamps epoch milliseconds, strikes integer thousandths of a dollar; null means unknown. Units →
200text/plain
The public protobuf schema for the negotiated REST bodies (bars / replay / gex grid / chain), served under Accept: application/x-protobuf.