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Use eth_getTransactionReceipt to confirm onchain inclusion. For general transaction issues such as fees, nonces, and gas limits, see Troubleshooting Transactions.

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RPC Method Is Unavailable

Use an endpoint that supports base_sendRawTransactionValidity. The method is available on Base Mainnet and Base Sepolia through the sequencer endpoints listed in Connect to Base, and on Vibenet.

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Submission Fails

Confirm that the first parameter is a signed legacy, EIP-2930, or EIP-1559 transaction. Confirm that the second parameter has a non-empty validity array. Check the predicate type, operator, and 0x-prefixed hexadecimal values. See Validity Transaction RPC for the request format. If the error is flashblock_index predicates are not supported after Denim: blocks are built every 200ms without flashblocks, remove the flashblock_index predicate. Base no longer supports it. Record the full JSON-RPC error when escalating an issue.

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Transaction Was Not Included

A transaction can remain pending because a predicate is false, another transaction has higher priority, it is replaced, or its maximum block passed.

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Transaction Expired

Submit a new signed transaction with a later block_number condition.

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Replacement Is Underpriced

Increase the fee fields, sign again, and retry with the same sender and nonce.

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Get Help

Include the network, RPC provider, transaction hash, predicate type, submission time, and JSON-RPC error. Do not share private keys, authentication data, or full signed transactions in public support channels. For community support, use the #developer-chat channel in the Base Discord.