Thanks for the links. I can't find in the article how much DARPA gave SpaceX, in dollars, and the second link talks about payment for the launch, not the grant.
The mission carried a $6.7 million price tag covered by the U.S. Air Force and the Defense Advanced Research Projects Agency (DARPA).
How big share of about AFAIK $90 millions spent on Falcon-1 program was from SpaceX investor(s) and how big was from external sources? In other words, how material was that external funding?
I think it stands to reason that if they were nearly bankrupt after flight floor, having to self-fund flights one, two, and three would have definitely bankrupted them.
I think they had money to make up to 4 flights. Looks like they got some money even before the flight 4, but not sure how much compared to their own expenses.
No; SpaceX received DARPA (https://ntrs.nasa.gov/api/citations/20060048219/downloads/20...), Air Force (https://www.space.com/2196-spacex-inaugural-falcon-1-rocket-...), and NASA funding (COTS, in 2006) prior to their first orbital success with Falcon 1.