minimumLedgerSlot

minimumLedgerSlot returns the lowest slot that the node still keeps in its on-disk ledger on Solana, the Proof-of-Stake chain whose native token is SOL. As a node runs it continuously purges older slots, so this value marks the bottom of the ledger window the node can read from directly. It is closely related to getFirstAvailableBlock but reports the raw ledger floor rather than the first queryable confirmed block. The method takes no parameters and returns a single u64. Call it against https://solana.therpc.io/YOUR_API_KEY as a JSON-RPC 2.0 POST.

Use cases

• Find the oldest slot this Solana node still has on disk before you fall back to an archival endpoint for deeper history.
• Bound a historical query to the node's ledger window, clamping a scan's start so it never reaches below the retained range.

Parameters

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Response

Example request

1curl https://solana.therpc.io/YOUR_API_KEY \
2  -X POST \
3  -H "Content-Type: application/json" \
4  -d '{
5  "jsonrpc": "2.0",
6  "id": 1,
7  "method": "minimumLedgerSlot",
8  "params": []
9}'

Errors & troubleshooting

Common pitfalls

• After a ledger purge this value can differ from getFirstAvailableBlock — the two are not always equal, so do not treat them as interchangeable when bounding a query.
• Some tooling refers to this as getMinimumLedgerSlot; the canonical Solana RPC name is minimumLedgerSlot, so check which spelling the endpoint accepts before wiring it up.

Supported networks

• Mainnet
• Devnet

See also

• getFirstAvailableBlock
• getBlocks