What Actually Makes a Registrar Relationship Reseller-Friendly Beyond Low Wholesale Pricing?

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Low wholesale pricing gets attention quickly, but I do not think that alone makes a registrar relationship reseller-friendly. The harder questions usually show up later: whether the API behaves predictably, whether billing logic is clear, how renewals feel at scale, how transfers are handled, what the DNS tools are like, and whether support actually understands partner workflows. A reseller can tolerate less-than-perfect margins more easily than unstable operations once client domains start stacking up. So I think the better question is not just who is cheapest, but which registrar creates the least operational friction once you are responsible for real customer domains.

For those running reseller or agency setups, what matters most after pricing: API, renewals, support, or something else?