Is it possible to fetch two stop codes with one SIRI request?

[LTS]

I want to fetch Real-time Stop Monitoring (SIRI) for two stop codes. The default rate limit of 60 requests per hour forces me to either fetch the entire GTFS RT / SIRI feed of an agency (which takes like 10 seconds to finish), or send two SIRI requests (which means I can only update the ETA board every 2 minutes instead of every minute, due to the 60 requests per hour per token rate limit).

Is there a way to fetch two stop codes with one request?