The two most prominent companies vying to capture the mobile phone payment market, Boku and Zong, are both announcing new Android billing platforms this morning.

Is it a coincidence? Almost certainly not. Android has been receiving a flood of attention since NPD Group research reported that Android phones were outselling the iPhone in early May, with new apps, social platforms and SDKs from both MySpace and Facebook quickly showing up. Better payment options are an obvious next step, and it seems likely that the two companies each caught wind of each other’s plans.

The core experience for both Boku and Zong is one-touch payment. While Android apps already had credit card and PayPal payment options, mobile payments cut the hassle of paying for something within an app significantly, by simply identifying the phone and user and billing the final amount back to the carrier.

Which company actually planned to launch its product first won’t matter for long. What will matter is how quickly the two competitors can finalize their products — both, for the moment, are still in invitation-only testing.

There’s also the matter of who has the most heft. Both companies are well capitalized and in the mood the spend on expansion. Zong just took $15 million in late April, while Boku took $25 million in January with a smaller follow-up round from Andreessen Horowitz announced a few days ago.

For now, the clear winner of this and the other Android additions we’re seeing are the Android developers themselves. They can apply to the respective Boku and Zong platforms here and here.