Bitcoin’s (BTC) “taker buy-sell ratio” recently surged on several crypto exchanges, signaling a renewed bullish sentiment around $29,000.

The ratio surged to 1.36 on Aug. 1 on ByBit, reaching the highest in at least a year, according to data tracked by South Korea-based blockchain analytics firm CryptoQuant. Values above 1 indicate that takers’ buy volume is outpacing the sell volume, a sign of bullish trading in the market. ByBit is the world’s third largest crypto perpetual futures exchange as per open interest and trading volume.

The ratio hit a three-and-a-half-month high of 1.17 on BitMEX on Tuesday and a six-month high of 1.31 on OKX on July 30.

The taker buy-sell ratio is the ratio of buy volume divided by the sell volume of takers in perpetual swap markets. Perpetual swaps are futures-like derivative contracts with no expiry, allowing traders to speculate on the value of the underlying asset.

Market takers are entities that put orders to buy or sell securities immediately, taking out liquidity from the order book. Trading firms, individual investors fall into the category of takers. Meanwhile, entities in the business of creating order book liquidity are market makers.

The data explains the recent bear failure to keep bitcoin below $29,000.

Since July, bitcoin has chalked out multiple daily candles with long lower wicks, indicating brief periods of sub-$29,000 trading. Prices jumped over 2% on Tuesday, topping the $30,000 mark for the first time.

According to CryptoQuant’s CEO Ki Young Ju, a spike in taker buy-sell ratio on low-volume exchanges like BitMEX is often a sign of increased buying by whales or large investors.

“Bitcoin whales opened giga longs at $29,000,” Ju tweeted Tuesday, referring the taker buy-sell ratio.