getFirstAvailableBlock | Alchemy Docs

Returns the slot of the lowest confirmed block that has not been purged from the ledger.

apiKeystringRequired

The slot number of the lowest confirmed block that is still available in the ledger.

1	curl -X POST https://solana-mainnet.g.alchemy.com/v2/docs-demo \
2	-H "Content-Type: application/json" \
3	-d '{
4	"jsonrpc": "2.0",
5	"method": "getFirstAvailableBlock",
6	"params": [],
7	"id": 1
8	}'