I found this github issue: https://github.com/input-output-hk/cardano-graphql/issues/507 discussing how to get assets of an address at a certain block using cardano-graphql / Hasura.
When I run the "SDL Version" of the query, as mentioned in the github issue, on the referenced page (https://graphql-api.mainnet.dandelion.link/), it works just fine.
When I try the same query on my cardano-graphql stack in Hasura, I get this error message:
field "paymentAddresses" not found in type: 'query_root'
I searched for similar errors, and it seems to have to do with permissions, but I can't figure out which permissions are missing.