{"record":{"id":"e9a2243c2e9a9b4e","repo":"nautechsystems/nautilus_trader","slug":"bitmex-returned-inconsistent-margin-account-ids","errorCode":null,"errorMessage":"BitMEX returned inconsistent margin account IDs: {account} and {}","messagePattern":"BitMEX returned inconsistent margin account IDs: (.+?) and (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"crates/adapters/bitmex/src/http/client.rs","lineNumber":2843,"sourceCode":"\n    Some(FundingRateUpdate::new(\n        instrument_id,\n        rate,\n        interval,\n        None,\n        ts_event,\n        ts_event,\n    ))\n}\n\nfn account_id_from_margins(margins: &[BitmexMargin]) -> anyhow::Result<Option<AccountId>> {\n    let Some(first) = margins.first() else {\n        return Ok(None);\n    };\n\n    let account = first.account;\n    if let Some(mismatch) = margins.iter().find(|margin| margin.account != account) {\n        anyhow::bail!(\n            \"BitMEX returned inconsistent margin account IDs: {account} and {}\",\n            mismatch.account\n        );\n    }\n\n    Ok(Some(bitmex_account_id(account)))\n}\n\n#[cfg(test)]\nmod tests {\n    use nautilus_core::UUID4;\n    use nautilus_model::enums::OrderStatus;\n    use rstest::rstest;\n    use serde_json::json;\n\n    use super::*;\n\n    fn margin_with_account(account: i64) -> BitmexMargin {","sourceCodeStart":2825,"sourceCodeEnd":2861,"githubUrl":"https://github.com/nautechsystems/nautilus_trader/blob/18893faf8b356be3320add8de2f861b0b647cf06/crates/adapters/bitmex/src/http/client.rs#L2825-L2861","documentation":"Raised when parsing account state: the BitMEX /user/margin endpoint returned margin rows whose 'account' field differs among the entries. The adapter derives the account ID from the first row and treats any mismatch as a corrupted or ambiguous response, refusing to pick one arbitrarily.","triggerScenarios":"Fetching balances/margin for an account where the response Vec<BitmexMargin> contains rows with different account IDs — usually only possible with an API response anomaly, unexpected multi-account data, or a malformed/intercepted response.","commonSituations":"Live trading on BitMEX with API keys whose wallet spans unusual states; proxy or mock servers returning concatenated/mixed responses; BitMEX API changes introducing extra account fields.","solutions":["Verify the API key corresponds to a single BitMEX account and has no cross-account token issues","Log and inspect the raw margin response to confirm which account IDs are present","Check for BitMEX API changes or a middleman/proxy altering the response body","Retry the request — a transiently corrupted response may succeed on re-fetch"],"exampleFix":"null","handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":"match client.request_account_state(...).await {\n    Ok(state) => { /* handle */ }\n    Err(e) if e.to_string().contains(\"inconsistent margin account IDs\") => {\n        // log raw response, retry once, then alert — indicates an API anomaly\n    }\n    Err(e) => return Err(e),\n}","preventionTips":["Use API keys bound to exactly one BitMEX account","Avoid response-modifying proxies in live trading paths","Keep the adapter updated for BitMEX API response changes","Alert on this error — it signals an unexpected venue response, not a caller bug"],"tags":["rust","bitmex","account","inconsistent-response"],"backgroundTag":"unexpected-api-response-shape","analyzedSha":"18893faf8b356be3320add8de2f861b0b647cf06","analyzedAt":"2026-09-08T20:49:34.690Z","contentChangedAt":"2026-09-08T20:49:34.690Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}