How do I pick a reliable Mexico API for my fintech app?

hey so i'm building a fintech app targeting Mexico users and i'm kinda lost on the Mexico API landscape.. like there's a ton of providers but no clear way to compare them

basically what i need is: identity verification (CURP and RFC lookups), payment rails (SPEI transfers), and ideally some employment or social security check via NSS or IMSS. the app is gonna do onboarding + lending so KYC is super critical

i've been reading through different docs but the quality varies a lot. some Mexico API providers have outdated swagger files, no sandbox, or their uptime is just not documented anywhere. i can't afford to bet on a provider that goes down during production

things i care about most:

• REST JSON responses (not SOAP please..)
• sandbox environment available before committing
• reasonable latency for CURP/RFC lookups — ideally under 2s
• compliance with LFPDPPP (Mexico data protection law)
• transparent pricing or at least a trial tier

if anyone has actually shipped something using a Mexico API in production, would love to know what worked and what didn't. btw does apipull.com list Mexico APIs? gonna check there too

thanks in advance, really appreciate any real-world input here