Ahead of the potentially dramatic BOJ decision tonight, the Japanese bond market is becoming increasingly jittery.

After 10Y JGBs sold off early in the session, with yields rising as high as 0.11% – the highest level in almost a year and a half – as the market continues to test the Bank of Japan’s intentions ahead of its policy decision, on Monday morning, the BOJ intervened again, offering to buy an unlimited amount of bonds for a third time in a week.

While unlimited in size, the central bank offer, made at 0.1% for bonds with 5-10 year maturities, drew some 1.6 trillion yen ($14.4 billion) of bids which were all accepted, the central bank reported just around 1am EDT. The 10-year yield pared the day’s advance after the move was announced.

Following the announcement, the 10-year JGB yield slid half basis point lower to 0.095%, compared with the 0.11% touched before the operation. This is over 3x more than the close of 0.03% just ten days ago ahead of media reports the BOJ will adjusted the parameters of its YCC.

As Bloomberg notes, Monday’s purchase was significantly larger than the 94 billion yen bought in the latest prior on Friday, as prevailing bond prices were below where the BOJ was buying, allow investors to take advantage of the free money.

The fixed rate of 0.10% for the operations on Friday and Monday was lower than the 0.11% offered at four previous operations for the five-to-10 year maturities. Monday’s fixed-rate operation was the seventh since the policy was introduced, and the first time it has conducted three operations within a single week as shown below.

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