Method not supported on this plan

Root causes

Ranked by frequency. First cause is the one to check first.

1. 01Calling archival methods on free-trial plans.
2. 02`getProgramAccounts` with no filters returns the entire account set — always rate-limited or blocked.
3. 03`getSignaturesForAddress` going back more than 1000 signatures requires archival history that standard-tier nodes don't keep.
4. 04`getBlock` on old slots (>32 slots behind tip) requires an archival node.

Fix steps

1. 1

   Check the method allowlist

   Subglow's full allowlist is documented — getProgramAccounts, getSignaturesForAddress, and getBlock on old slots are Dedicated-only. Sniper and Pro plans get everything else.

2. 2

   Use gRPC instead of getProgramAccounts for live data

   If you're using getProgramAccounts to watch for account changes, switch to a gRPC `accounts` subscription with owner filter — it's real-time and orders of magnitude cheaper than polling.

3. 3

   Upgrade to Dedicated for historical queries

   Subglow Dedicated includes archival JSON-RPC with no method restrictions. Pricing is custom — reach out via `/dedicated` for a quote. Helius equivalent is Business; QuickNode is Enterprise.

4. 4

   Use Geyser to keep your own snapshot

   For long-running bots, maintain your own program-account snapshot fed by a gRPC `accounts` subscription with owner filter. You get O(1) reads with no provider call at all — the Subglow `/solana-validator-geyser-setup` guide walks through this.

Related errors

• Node is behind (slot lag on RPC)
  Your RPC endpoint is lagging behind the tip of the chain. Symptoms: `getSlot` returns a number much lower than Solana Explorer, `getAccountInfo` returns stale data, `getLatestBlockhash` gives expired blockhashes. Usually a shared-endpoint issue.
• BlockhashNotFound on sendTransaction
  Your transaction failed with `BlockhashNotFound`. You used a blockhash the validator that received your submit no longer has in its recent cache — either stale, or you got it from a different node in a load-balanced pool.