Best API for Nationwide MLS Listings in a Real Estate Platform?

Hi everyone,

I've custom built a real estate platform for a client using Laravel as the backend and livewire and blade for the frontend.

Separately, I have a deep learning service in a separate repo that provides features like property recommendations for leads, among other ML functionality.

I'm now at the point where I need to integrate listing data from multiple sources, specifically:

Nationwide MLS listings Featured listings Listings that individual real estate agents post themselves

Ideally, I'm looking for one or more APIs that return JSON responses and can be consumed by my Laravel application. My plan is to ingest the data and combine it with my own application data and recommendation engine.

For those of you who have built real estate platforms before:

Which MLS/data providers would you recommend? Is there a provider that offers broad nationwide coverage, or is it generally necessary to integrate with multiple MLSs? Are there any APIs that also support agent-posted or featured listings, or would those typically need to come from a separate source? Any pitfalls or licensing restrictions I should be aware of before choosing a provider?

I'd appreciate any recommendations or insights from developers who have gone through this process. Thanks!