Westborough, Mass.--B-to-b vendor EC Cubed Inc. couldn't land the big e-marketplace customer it needed to make its name--nor apparently the funding it needed to keep trying. The vendor, which earlier this year reworked its Java-based component software into a platform for building b-to-b marketplaces, has closed its doors, a company spokesman confirmed. The company had been seeking second-round funding, a tough job in today's tightening market. EC Cubed, while little known, was a relative e-commerce veteran. The company's founders fine-tuned their technology approach back in the mid-1990s while building GE Capital Corp.'s SourceOnline project, an early take on b-to-b e-marketplaces. But the company could never find a market for its innovative technology. It's latest attempt to market its platform was as a so-called "build-to-order" ASP, which would help companies quickly build e-marketplaces that could still be customized for their unique needs.