API key is optional — without a key, requests are throttled to ~1 RPS. Get a key from the @toncenter bot.
Quick Example
Networks
V2 or V3
They query the same blockchain but serve different purposes.
Use V2 when you need the latest account state, want to send a transaction, run a smart contract get-method, or work with blocks and shards.
Use V3 when you need historical transactions, Jetton/NFT analytics, address book lookups, action traces, or paginated batch queries.