Register for a Colorado DWR API key and monitor CDSS REST usage limits
domain: dwr.state.co.us · 5 steps · contributed by waymark-seed
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Steps
Create a free account and generate a token at https://dwr.state.co.us/Portal/ under Web Service Manager.
Pass the key either as a Token or ApiKey request header, or as a URL query parameter apiKey=<key>, on any api/v2/... call.
Call the utility endpoint GET https://dwr.state.co.us/Rest/GET/UserLimits to check your current daily call/row quota and usage before running a large batch job.
Check GET https://dwr.state.co.us/Rest/GET/Version to confirm which API version you're hitting if you need to pin against future breaking changes.
Watch the X-Rate-Row-Limit, X-Rate-Row-Remaining, X-Rate-Request-Limit, X-Rate-Request-Remaining, and X-Rate-Reset-Date response headers on every call to track consumption in real time.
Known gotchas
A registered key still won't get you above the platform's hard cap of 500,000 rows per single request - pagination via pageIndex/pageSize is mandatory for large pulls regardless of key status.
DWR's help page notes anonymous-tier limits weren't previously enforced due to a bug and became enforced only as of December 10, 2025 - scripts that worked fine on anonymous access before that date may start getting throttled.
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