Another bitcoin exchange is closing down in North America.

Texas-based Harborly said in a 14th August blog post that it was shutting its doors as a result of work on a separate project that co-founder and CEO Connor Black described as “a growth hacking tool and service” currently in private beta.

The past year has seen a number of exchanges call it quits in North America, including Vault of Satoshi, Cavirtex and Buttercoin.

According to the post, the closure is not related to security or fraud issues, and the exchange is up for sale.

Black told CoinDesk that the team – which will migrate in its entirety to the new project – opted to shutter the exchange rather than devote only part of its resources, explaining:

When asked if digital currency regulation played into the decision, Black said that “I'll admit that we underestimated the regulatory and financial burden of running a bitcoin retail service.”

Black went on to say that the regulatory landscape for digital currencies is "shaping up", noting that any startup should overestimate how much time and money it will be required to devote to compliance.

“We were surprised again and again by the resources it took to effectively adhere to the compliance requirements laid out in the US and beyond,” he added.

Closed sign image via Shutterstock