Cold pitch from a founder to another founder
You're a founder building [product]. You want to start a relationship with another founder who could be a customer / referral source / co-marketer.
Saw your post on [specific topic from their last 14 days, 1 sentence reference]. [Specific reaction or extension — a real thought, not flattery]. I'm building [your product] for [their type of operator]. Curious — how do you currently handle [the specific problem your product solves]?
Why this works
Opens with proof-of-attention (you read their actual work), adds substantive thought (not 'great post!'), then asks a question they can answer in one line. The question is the ask; you're not pitching the product yet.