This is a recap of what happened on the night of October 11th, according to a quantitative market maker. Binance has yet to explain why all external orders were rejected between 5:00 AM and 6:00 AM (UTC 8) on October 11th. The truth may be complex, but it will surely come.
Communication regarding the Binance Exchange system outage claim application
This account has cumulatively lost over $1 million worth of ETH.
If the losses occurred during other periods, or if our incident was isolated, we would have accepted the loss. It's not a large amount...
This is essentially the case for all PM accounts with open positions. We have a very strong chain of evidence. A zero-sum claim is difficult to accept.
Our application is very reasonable. We also lost money on our ETH/BTC/SO holdings, but that's not covered by this claim. We only requested information related to the period indicated by the evidence link. Regarding our XRP/DOGE holdings, we wouldn't dare do that. We presented our claims scientifically and reasonedly in good faith (and despite having multiple accounts contributing to Binance's trading volume for a long time), yet they were ignored and simply handled.
Binance's revised API documentation
developers.binance.com/docs/…
Previous compensation was based on the 503 status code in the testnet General Info. The core evidence is the 503 variant [C]. The error code in my log violates the "ReduceOnly priority" commitment. The 200 retries and 106 minutes of continuous failure further demonstrate systemic flaws. The errors in the logs are API-level error codes (the "code" field in the JSON response). The HTTP status code (like 503) doesn't acknowledge that there was a problem with the matching engine during the downtime (it simply states a 10% rejection rate). I don't know where the 10% came from. Did they report it? The statistical standard is that it looks okay visually? It seems okay. When was the general info updated? Previously, the public documentation didn't have general info for the PM account. There was only one endpoint, a unified account endpoint (I don't know if it was a mirror). What is this testnet? Is it a test system for the PM system? A complete disregard for losses
I. Claim Summary
Amount Claimed: 591,835 USDT
Reason for Claim: ReduceOnly orders were rejected due to an exchange system failure. The HTTP 503 error indicated the system was completely unavailable, preventing stop-loss orders from being closed, resulting in significant losses.
Event Date: October 11, 2025
II. Loss Details
1. DOGE/USDT: USDT Perpetual Contract
· Loss Amount: 443,835 USDT
· Position Size: 3,413,001 DOGE
· Initial Collateral: Approximately 656,000 USD
· Unrealized Loss: -266,000 USD (Continuously Worsening)
· Issue Type: Unable to execute ReduceOnly order to close positions
2. XRP/USDT: USDT Perpetual Contract
· Loss Amount: 148,000 USDT
· Position Size: 7,326.10 XRP
· Initial Collateral: Approximately 17,144 USD
· Unrealized Loss: -5,781 USD (Continuously Increasing)
· Issue Type: Unable to execute ReduceOnly liquidation order. III. Event Details
Event Timeline
October 11, 2025, 05:12–07:02 AM (UTC 8) Phase 1: Risk Identification and Liquidation Attempts (05:12–05:16)
1.05:12:15 - System detected position risk and attempted liquidation of SOL/USDT: USDT
2.05:12:22 - Attempted liquidation of BTC/USDT: USDT (automatically deleveraged)
3.05:12:36 - Attempted liquidation of DOGE/USDT: USDT (automatically deleveraged)
First error: NEW_ORDER_REJECTED (-2010)
4.05:13:08 - Attempted liquidation of ETH/USDT: USDT
Error: ReduceOnly_Rejected (-2022) Phase 2: Systemic Failure Begins (05:15-05:16)
05:15:45 - Attempted to close XRP/USDT:USDT position
Error Code: -4118\1008 HTTP Status: 503 Service Unavailable
Error Message: "ReduceOnly Order Failed. Please check your existing position and open orders."
06:15:50 - Attempted to close DOGE/USDT:USDT position. Position: 3,413,001 DOGE
Error Code: -4118\1008 HTTP Status: 503 Service Unavailable
Error message: "ReduceOnly Order Failed. Please check your existing position and open orders."
7.05:16:09 — DOGE position closing failed, system retries 20 times.
Position size: 3,413,001 DOGE
Collateral: 656,832 USD
Unrealized loss: -266,118 USD
Attempted closing quantity: 3,000,000 DOGE. All retries failed.
8.05:16:16 — XRP position closing failed, system retries 5 times.
Position size: 7,326.10 XRP
Collateral: 17,134 USD
Unrealized loss: -5,771 USD USD
. Attempted position closing: 5,860.88 XRP (4/5 positions). All retries failed.
Phase 3: Continued deterioration (05:16-07:02)
9.05:16-06:58—Continuous attempts to close positions, cumulatively failing over 200 times.
Each attempt received the same error code—4118/—1008. Positions could not be reduced, and risk exposure continued.
Unrealized losses continued to increase.
10.06:44-06:55—Market volatility increased.
The system attempted to open a new position (possibly a hedging attempt). However, the old position could not be closed.
The error continued.
11.06:58-07:02—Final position closing attempt.
Continued attempts to close DOGE and XRP positions.
All attempts failed.
Event log end: 07:02:02 IV. Technical Evidence
Error Code Analysis
1. Error Code—1008
2. Error Code—4118
Error: Could not place sell order Due to Operation Rejected
Message: {"code": -4118, "msg": "ReduceOnly Order Failed. Please check your existing position and open orders."}
Error: HTTP 503 Service Temporarily Unavailable
Message: {"code": -1008, "msg": "Server is busy, please try again later."}
This error means:
·ReduceOnly orders are specifically used to reduce positions and mitigate risk.
·This order type should be given the highest priority.
·The error message indicates that the exchange rejected the risk management order. 2. Error Code—2022
Error: Could not place sell order due to ReduceOnly_Rejected
Message: {"code": -2022,"msg":"ReduceOnly Order is rejected."
3. Error Code—2010
Error: Could not place sell order due to NEW_ORDER REJECTED
Message: {"code": -2010, "msg": "Order would trigger immediately."}
System Log Evidence Key log snippets:
2025-10-11 05:16:09,599 UTC 08:00 | WARNING PGSystem. strategy Bot 1
Attempting to close position DOGE/USDT: USDT Reason: auto deleveraging
Position Size: 3413001.00000000 | Collateral: 656832.042USD
Unrealized PnL: -266118.65632998 USD
2025-10-11 05:16:09,715 UTC 08:00 ERROR PGSystem. execution Bot 1
Position Size: 3413001.00000000 | Collateral: 656832.042USD
Unrealized PnL: -266118.65632998 USD ReduceOnly order size: 3000000.00000000 Error closing position DOGE/USDT: USDT: Could not place sell order due to
OperationRejected. Message: binance
{"code":-4118,"msg": "ReduceOnly Order Failed. Please check your existing position and open orders."}
2025-10-11 05:16:09,720 UTC 08:00 ERROR PGSystem. execution Bot 1
Error closing position DOGE/USDT: USDT: HTTP 503 Service Temporarily Unavailable.
Message: binance {"code":-1008, "msg": "Server is busy, please try again later."}
2025-10-11 05:16:16,452 UTC 08:00 WARNING PGSystem. strategy Bot 1
Attempting to close position XRP/USDT: USDT Reason: auto deleveraging
Position Size: 7326.10000000 | Collateral: 17134.283 USD
Unrealized PnL: -5771.47879486 USD
2025-10-11 05:16:16,572 UTC 08:00 ERROR PGSvstem. execution Bot 1
Position Size: 7326.10000000 | Collateral: 17134.283 USDI
Unrealized PnL: -5771.47879486 USD | ReduceOnly order size: 5860.88000000(4/5 position)
Error closing position XRP/USDT: USDT: Could not place sell order due to
OperationRejected. Message: binance
{"code": -4118, "msg": "ReduceOnly Order Failed. Please check your existing position and open orders."
2025-10-11 05:16:16,578 UTC 08:00 ERROR PGSystem. execution Bot 1
Error closing position XRP/USDT: USDT: HTTP 503 Service Temporarily Unavailable.
Message: binance {"code":-1008,"msg": "Server is busy, please try again later."
V. Cause Analysis
1. Exchange engine load rejection (Load Rejection
According to system log analysis, during the incident, the exchange engine experienced excessive load and automatically rejected new orders.
2. Systematic Order Blockage
Time Period: 05:15:45–07:02:02 (106 minutes)
· All ReduceOnly orders were systematically blocked.
· Error Codes: -2010, -2022, -4118 \HTTP: -1008 Affected Orders: 200
· Continuous HTTP 503 errors prove the exchange's system is completely unavailable.
In this incident, Binance failed to fulfill the aforementioned obligations, constituting a breach of the service agreement.
2. Clear causal relationship
Direct causal chain:
1. Binance system failure (fact)
2. ReduceOnly order rejection (fact)
3. Unable to execute risk management (fact)
4. Continuous exposure leading to losses (fact)
5. Continuous HTTP 503 errors prove the exchange's system is completely unavailable (fact)
3. Quantifiable losses
· Clear record of initial unrealized losses
· Verifiable final loss amount
· Complete and clear timeline
· Direct and clear causal relationship
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