Failed Blockchain Transaction With Error ‘UniswapV2Router: INSUFFICIENT_B_AMOUNT’

Case: Error manifests as INSUFFICIENT_A_AMOUNT as well, when attempting a token swap at a DEX or locking funds as liquidity. Has been observed on different chains: Ethereum, Fantom, etc.

Solution

When submitting transaction, keep increasing default slippage at 0.25% increments until the transaction passes. Recommended max: 5%.

References

 

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