API design.

The API design collection connects product questions to request structure, identity rules, source adapters, and acceptance tests. Read the introductory guide first when choosing between node data, indexing, and market observations. Then use the chain-specific articles to examine state references and recovery. The proposed patterns are starting points for your own review rather than universal provider guarantees.

Each guide keeps its publication date, primary-source reference, and topic-specific context. Read the full article before reusing a method or interpreting a metric; the cards summarize the route, not the complete evidence.