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We have implemented a rate limiting system for all authenticated brokerage calls through the API. It is designed to protect accounts from abuse and servers from load. We aim to put limits in place that provide protection but do not hinder the usability of the API.
These are the current limits in place:
You can find rate limit information in the response headers of all calls that are limited. These headers can help you throttle your application as well as provide information about your current limit quota.
Here is an example of the response headers for a trade/quote call:
HTTP/1.1 200 OK Content-Length: 6024 Content-Type: application/xml; charset=UTF-8 Date: Wed, 16 Mar 2011 14:51:44 GMT Server: Apache-Coyote/1.1 X-RateLimit-Used: 8 X-RateLimit-Expire: 1300286940 X-RateLimit-Limit: 60 X-RateLimit-Remaining: 52
If you exceed these limits you will receive a rate limit fault along with the same rate limiting headers you would receive in the response. You will receive this as a response until the limit has expired, at which point you will receive regular responses.
Any mention of actual symbols are to be used for coding purposes only and do not imply a recommendation or solicitation to buy or sell a particular security or to engage in any particular investment strategy.
At the time of publication and in the preceding month, Ally Invest did not have ownership greater than 1% in any stocks mentioned here and does not have any other actual, material conflict of interest known at the time of publication.
Ally Invest did not receive compensation from a public offering or from investment banking services related to any companies mentioned here within the past 12 months, or expects to receive any in the next 3 months. Ally Invest did not engage in market making in the securities mentioned here.
Ally Invest Securities' background can be found at FINRA's BrokerCheck. Options involve risk and are not suitable for all investors.
Review the Characteristics and Risks of Standardized Options brochure (PDF) before you begin trading options. Options investors may lose the entire amount of their investment in a relatively short period of time.