{"record":{"id":"a21bd644d4324df2","repo":"nautechsystems/nautilus_trader","slug":"pool-state-at-block-profiler-block-is-ahead-of-t","errorCode":null,"errorMessage":"Pool state at block {profiler_block} is ahead of the latest block {latest_block}; the execution RPC endpoint lags the data feed","messagePattern":"Pool state at block (.+?) is ahead of the latest block (.+?); the execution RPC endpoint lags the data feed","errorType":"validation","errorClass":"anyhow::Error","httpStatus":null,"severity":"error","filePath":"crates/adapters/blockchain/src/execution/client.rs","lineNumber":4270,"sourceCode":"    [\n        Some(pool.dex.swap_created_event.as_ref()),\n        Some(pool.dex.mint_created_event.as_ref()),\n        Some(pool.dex.burn_created_event.as_ref()),\n        Some(pool.dex.collect_created_event.as_ref()),\n        pool.dex.flash_created_event.as_deref(),\n        pool.dex.fee_protocol_update_event.as_deref(),\n        pool.dex.fee_protocol_collect_event.as_deref(),\n    ]\n    .into_iter()\n    .flatten()\n}\n\nfn validate_quote_age(\n    profiler_block: u64,\n    latest_block: u64,\n    max_age_blocks: u64,\n) -> anyhow::Result<()> {\n    anyhow::ensure!(\n        profiler_block <= latest_block,\n        \"Pool state at block {profiler_block} is ahead of the latest block {latest_block}; the execution RPC endpoint lags the data feed\"\n    );\n    let quote_age = latest_block - profiler_block;\n    anyhow::ensure!(\n        quote_age <= max_age_blocks,\n        \"Stale quote: pool state at block {profiler_block}, latest block {latest_block}, exceeds `max_quote_age_blocks` {max_age_blocks}\"\n    );\n    Ok(())\n}\n\nfn validate_rpc_transaction_matches_payload(\n    transaction: &RpcTransaction,\n    raw_transaction: &[u8],\n) -> anyhow::Result<()> {\n    let signed = decode_signed_transaction(raw_transaction)?;\n    anyhow::ensure!(\n        transaction.hash == signed.hash","sourceCodeStart":4252,"sourceCodeEnd":4288,"githubUrl":"https://github.com/nautechsystems/nautilus_trader/blob/18893faf8b356be3320add8de2f861b0b647cf06/crates/adapters/blockchain/src/execution/client.rs#L4252-L4288","documentation":"validate_quote_age checks that the block at which pool state was read (from the profiler/data feed) is not newer than the latest block reported by the execution RPC endpoint. If the pool state block is ahead, the execution endpoint is lagging the data feed, and quote age cannot be computed correctly, so the library throws.","triggerScenarios":"Calling validate_quote_age with profiler_block > latest_block — i.e., the execution RPC's latest block number is behind the block height of the cached pool state/quote.","commonSituations":"Execution RPC on a lagging or rate-limited node while the data feed runs ahead; split providers (fast data-feed provider, slow execution provider); a node stuck syncing or on a different fork; clock-free block-height mismatch after a data-feed provider upgrade.","solutions":["Point the execution RPC at a faster/fuller node (same provider tier as the data feed).","Refresh the latest block from the execution endpoint and retry; if persistent, the node is stuck — restart or replace it.","Unify providers: use one provider for both data feed and execution, or add cross-provider block-height monitoring.","Check node sync status (eth_syncing) and wait for catch-up before quoting."],"exampleFix":"// before: execution endpoint lagging the feed\nlet exec_rpc = Provider::new(lagging_url);\n\n// after: use a synced endpoint consistent with the feed\nlet exec_rpc = Provider::new(primary_feed_url);","handlingStrategy":"validation","validationCode":"let latest_block = exec_rpc.get_block_number().await?;\nif profiler_block > latest_block {\n    // execution endpoint lags; refresh or wait before quoting\n    return Err(\"execution RPC behind data feed\".into());\n}","typeGuard":null,"tryCatchPattern":"match client.get_pool_quote(pool).await {\n    Ok(q) => q,\n    Err(e) if e.to_string().contains(\"ahead of the latest block\") => refresh_endpoint_and_retry(e).await,\n    Err(e) => return Err(e),\n}","preventionTips":["Use providers of equal quality for data feed and execution","Monitor eth_syncing and block-height deltas across endpoints","Alert when the execution node falls behind the feed"],"tags":["rpc","sync","blockchain","staleness"],"backgroundTag":"invalid-argument-value","analyzedSha":"18893faf8b356be3320add8de2f861b0b647cf06","analyzedAt":"2026-09-08T20:49:34.690Z","contentChangedAt":"2026-09-08T20:49:34.690Z","schemaVersion":2},"datasetVersion":"2026-09-14T00:17:10.932Z"}