This is what you get when you try to use v2 without an API key.

{
 "error": {
  "errors": [
   {
    "domain": "usageLimits",
    "reason": "dailyLimitExceededUnreg",
    "message": "Daily Limit Exceeded. Please sign up",
    "extendedHelp": "https://code.google.com/apis/console";
   }
  ],
  "code": 403,
  "message": "Daily Limit Exceeded. Please sign up"
 }
}
You will notice that you get an error object, which includes a code property. 
So yes, you will get an error, with code and message that you can check.

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 Apr 3, 2011, at 12:01 AM, 汪军 wrote:

> Thanks. But does there is a error code to indicate  quota has been exceed in 
> API v2? like 200 will be return be returned as every thing is fine. It's says 
> if there was an error in translating the text, it will presented by 
> http-style error code in api's  reference.
> http://code.google.com/apis/language/translate/v1/reference.html
> 
> 2011/4/3 Jeremy Geerdes <[email protected]>
> It depends on the version of the API. v1 will return a JSON object with an 
> error message about suspected TOS abuse. And v2 will return a very nice JSON 
> object with a message that says you've exceeded your quota.
> 
> 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 Apr 2, 2011, at 11:11 AM, jun Wang wrote:
> 
> > As we know, there is a limit in number of characters per key one day.
> > But it not mentioned what will google return when this situation
> > happened ( or just I have not found it  ). Does anyone know this?
> > thanks a lot
> >
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>   汪军 
> 
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