Why do I get "gas limit too high" (error -32003) on eth_sendRawTransaction?

This error means the network rejected your transaction because the gas limit you set exceeds the maximum allowed for a single transaction. Each chain enforces its own per-transaction gas limit, which is separate from the overall block gas limit and from any limits on Alchemy's side.

How to fix it

• Call eth_estimateGas for your transaction to get an accurate estimate of the gas it actually needs.

• Add a reasonable buffer on top of that estimate, for example 10-20%.

• Re-sign and resend your eth_sendRawTransaction call with the updated gas limit.

Setting a very high gas limit does not make a transaction more likely to succeed. If it exceeds the chain's per-transaction cap, the transaction is rejected instead of processed.

Related docs

• eth_estimateGas