There is no published hard query or rate limit on the Feeds API. There are, 
however, some dynamic throttling mechanisms that attempt to thwart abuse. The 
details of these mechanisms are not really public knowledge, but they have told 
us that they work on a "per-user" basis. Since it would be exceptionally 
difficult to reliably distinguish between individual end users behind a NAT 
firewall, for example, it would seem safe to assume that the limits are per IP 
address.

That said, there are indications that, eventually, the Feeds API will probably 
be migrated to the new API infrastructure (which powers the Custom Search API 
and a number of others), at which point any limits would be on the application 
level (i.e., against the API key).

Jeremy R. Geerdes
Generally Cool Guy
Des Moines, IA

For more information or a project quote:
[email protected]

If you're in the Des Moines, IA, area, check out Debra Heights Wesleyan Church!

On Aug 23, 2011, at 6:43 AM, omeriko wrote:

> Hi,
> I'm thinking of using Google's feed API in a Desktop's RSS reader.
> However, I haven't found a conclusive answer regarding the API
> limitations.
> 
> Is the API limited by IP or by the key and what are the limitations?
> 
> Thanks,
> Omer
> 
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