What is the query limit on Yahoo's Finance API?

UPDATE:

Rate limits in YQL are based on your authentication. If you use IP-based authentication, then you are limited to 2,000 calls/hour/IP to the public YQL Web service URL (/v1/public/) or 20,000 calls/hour/IP to the private YQL Web service URL (/v1/yql/) that requires OAuth authorization. See the YQL Web Service URLs for the public and private URLs. Applications (identified by an Access Key) are limited to 100,000 calls/day/key*.

However, in order to make sure the service is available for everyone we ask that you don't call YQL more than 0.2 times/second or 1,000 times/hour for IP authenticated users and 2.7 times/second or 10,000 times/hour.

See the Yahoo Query Language Usage Information and Limits page. This is for all of the YQL APIs, not just the Finance API.

YQL Rate Limits:

What this means:

• Using the Public API (without authentication), you are limited to 2,000 requests per hour per IP (or up to a total of 48,000 requests a day).
• Using the Private API (with OAuth authentication using an API Key), you are limited to 20,000 requests per hour per IP and you are limited to 100,000 requests per day per API Key.

The above answer was originally posted here by me.

Yahoo's YQL allows you to query Yahoo! Finance data. Their usage limits are as follows:

• Unauthenticated: up to 1,000 calls/day
• Authenticated: up to 100,000 calls/day

See Yahoo's Query language FAQ for more details at http://developer.yahoo.com/yql/faq/