Peers in the Hypermedia network connect over libp2p, and they exchange gRPC messages. Primarily, the peers are exchanging references to  IPFS blobs. These blobs are then exchanged with the IPFS bitswap protocol, and are then validated as a part of the peer's local indexing process. This API is not yet stable and remains undocumented. To learn more, you refer to the protobuf definition files:

We have created a simple Agent Skill which you can use with a wide variety of LLM Agents: Seed Hypermedia Agent Skill To install the skill on your machine, run: npx skills add https://github.com/ericvicenti/seed-hypermedia-skills --skill seed-hypermedia

You can connect to the HTTPS API of a Hypermedia web site, using the Seed CLI:

We have a JSON REST API which allows developers to access a Seed node who is exposing a web server. This is used by the front-end of any Seed web site. Not currently documented. Coming soon to the protocol documentation. You may browse the code entry point here on github, and the endpoints are defined here.