3. Quick Reference

GET /events/by-ledger
  ?from=&to=&limit=&offset=

GET /events/by-contract/{id}
  ?limit=&offset=
  ?from=&to=           # ledger branch
  ?topics=a,b,c        # topics branch

GET /events/by-contracts
  ?contracts=a,b,c
  ?limit=&offset=

GET /events/by-topics
  ?topics=a,b,c
  ?limit=&offset=

GET /events/by-ledger/contracts
  ?contracts=a,b,c
  ?from=&to=&limit=&offset=

GET /events/by-tx/{tx_hex}

GET /txs/by-ledger
  ?from=&to=&limit=&offset=

GET /txs/by-contract/{id}
  ?limit=&offset=
  ?from=&to=

GET /txs/by-contracts
  ?contracts=a,b,c
  ?limit=&offset=

GET /txs/by-ledger/contracts
  ?contracts=a,b,c
  ?from=&to=&limit=&offset=

GET /txs/by-hash/{tx_hex}