msg = "min relay fee not met, 0 < 226 (code 66)";

[Maochengfag]

I am doing BTC transaction , use BTCTransaction class I just setFee:like this: BTCTransaction *tx = [[BTCTransaction alloc] init]; long gas = [self caculateFee:fee andAmount:amount andUtxos:txouts]; tx.fee = gas;

• (long)caculateFee:(NSString )feeRate andAmount: (long)amount andUtxos:(NSArray )utxos{ long utxoAmount = 0L; long utxoSize = 0L; long fee = 0L; for (BTCTransactionOutput txout in utxos) { utxoSize++; if(utxoAmount >= (amount + fee)){ break; }else{ utxoAmount += txout.value; fee = (utxoSize 148 + 342+10) [feeRate longLongValue]; } } return fee; }

[Maochengfag]

get the feeRate from https://bitcoinfees.earn.com/api/v1/fees/recommended