Connext has a GraphQL API Endpoint hosted by The Graph called a subgraph for indexing and organizing data from the Connext smart contracts. Subgraph information is serviced by a decentralized group of server operators called Indexers.
This subgraph is can be used to query Connext bridge transactions, transactions statuses and more.
Mainnet Subgraphs
Testnet Subgraphs
Creating an API Key Video Tutorial