Clients interact with Avalanche through APIs calls to nodes. Numeric parameters in API calls may be given as strings (e.g., "5" or 5 are both ok for an integer argument). Numeric return values are always given as strings (e.g., "5" rather than 5). In examples, API calls are made to a node listening for HTTP traffic on 127.0.0.1:9650.
****Platform Chain (P-Chain) API allows clients to interact with the P-Chain (Platform Chain), which maintains Avalanche’s validator set and handles blockchain and subnet creation.
Contract Chain (C-Chain) API allows clients to interact with the C-Chain, Avalanche’s main EVM instance, as well as other EVM instances.
****Exchange Chain (X-Chain) API ****allows clients to create and trade assets, including AVAX, on the X-Chain as well as other instances of the AVM.
****Keystore API allows clients to use an Avalanche node’s built-in keystore.
****Health API allows clients to check a node’s health.
Metrics API allows clients to collect Prometheus metrics about a node.
Admin API allows clients to examine a node’s internal state, set of connections, and similar internal protocol data.
****Info API allows clients to examine basic information about a node.