Well, I think the primary needle to move would be the max rate limit, with plan overages costing more.
I've heard numbers along the lines of millions of Twitter apps. From last year: http://mashable.com/2011/07/11/twitter-1-million-application... Who knows the percentage of serious apps. Twitter probably. Still, I'd imagine even would-be serious apps would pay for minimal Twitter API access.
I wouldn't be surprised if a lot of those applications ended up being "test" applications. I know each developer at my last job had at least one test app of their own, with many of us using at least 4-5 test apps.
addendum: This was for 2 actual production applications.
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Unless it's a per/something charge the numbers wouldn't be significant. I would guess there's less than a thousand serious API developers.
Well, I think the primary needle to move would be the max rate limit, with plan overages costing more.
I've heard numbers along the lines of millions of Twitter apps. From last year: http://mashable.com/2011/07/11/twitter-1-million-application... Who knows the percentage of serious apps. Twitter probably. Still, I'd imagine even would-be serious apps would pay for minimal Twitter API access.
I wouldn't be surprised if a lot of those applications ended up being "test" applications. I know each developer at my last job had at least one test app of their own, with many of us using at least 4-5 test apps.
addendum: This was for 2 actual production applications.