Question
How do I track FanDuel line movement?
Short answerPoll GET /api/v1/changes with since set to the last next_cursor you received: each row is one line, price or status change, oldest first. Read /api/v1/props/{id}/history when you need one prop's whole tape.
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In more detail
Polling the change feed costs one request per page however many props you follow, which is why it is the cheap way to stay current. Start with since=0 and keep the cursor between runs.
Example
curl "https://fanduelapi.com/api/v1/changes?since=0&limit=100" \
-H "Authorization: Bearer $FANDUEL_API_KEY"