What is the rate limit on Marketplace API keys?

• There is a PROD key rate limit of 180 requests / minute.

Does Marketplace API include an APTC subsidy calculator?

• No, there is not an endpoint that explicitly calculates the APTC subsidy. Marketplace API will give an estimate of an entire household's APTC, but it is only an estimate and should not be relied on to match FFM exactly.

Are there any non-public Marketplace API endpoints?

• Yes. Check the Marketplace API documentation for the endpoints open for public use. 
  

Are there any agreements to sign before officially using Marketplace API?

• At this time there is no agreement to sign before beginning to use Maketplace API.