Crypto APIs products

Start with Address Latest: it needs no setup and answers for roughly the last 14 days, which covers "what happened recently". For a full history you need Address History, which requires the address to be synced first and then bills per address per day for as long as it stays synced.

No. The REST APIs answer from our infrastructure, so there is nothing to sync and nothing to operate. Raw JSON-RPC calls are part of the Blockchain API today; NodeGrid RPC, coming soon, adds one endpoint per chain with automatic failover across providers, and Dedicated Nodes isolate your throughput.

You do not give it to us. Derive addresses from an extended public key, watch them with a webhook, call Prepare Transactions for an unsigned transaction, sign it on your own server with the offline signer, then broadcast it. The signer is an npm package that makes no network call, and signing costs no credits.

Blockchain Events. You subscribe an address or a block event to a callback URL and we POST to it — incoming and outgoing transactions, confirmations, and mined blocks — so you are not polling for state that has not changed.