I've seen this question pop up a lot in fan groups. The tricky part with a series like 'Alpha's Claimed Mate' is pinning down the official source, since a ton of similar paranormal romance stories get serialized across different apps and websites. Webnovel and GoodNovel often have these, but they operate on a coin or unlock system—you might get the first dozen chapters free as a sample to hook you, then you hit a paywall. Reading chapter-by-chapter for free usually means hunting for promotional periods where the app 'releases' a locked chapter daily, or relying on the author's own free releases on sites like Wattpad or Inkitt as a marketing tactic before they move the completed work to a paywalled platform. My advice? Search the exact title on those free serial sites first. Sometimes authors leave early drafts up even after publishing elsewhere. I found the first arc of 'Ruthless King' that way after it went premium. If it's not there, the official app's free daily pass or watching ads for 'fast passes' is the only legal route. Straight piracy sites are a mess of broken links, missing chapters, and terrible machine translations that butcher the dynamic between the leads, which is the whole point of reading something like this.
Honestly, the update frequency matters too. If it's ongoing, the author might be releasing a free chapter weekly on their blog or Patreon to build an audience. Completed stories are almost always fully locked behind a purchase or subscription. The chapter-by-chapter model is designed to be addictive, so the free access is really just the bait. I got sucked into 'The Alpha's Forbidden Mate' that way and ended up spending more than I'd like to admit on coins to binge the rest.