Shameless plug, but Moov offers a single API for payments. The clearing house's RTP system will be supported shortly, and FedNow is coming soon after. Check out out here: https://moov.io/
You would think there would _at least_ be a ceiling price. Makes me wonder why they can't show _any_ pricing.
"Spend the time and energy to build us into your product first and then we can talk price" is not the most reassuring of pitches.
I think the pricing is weird because you can start (and run!) for free, while the end to end solution requires negotiating with multiple parties.