Looking for a reliable RFC Taxpayer API to automate identity verification in our lending platform
Question
Answers
We tested three RFC taxpayer API providers before settling on one from apipull.com API Hub. The key differentiator was response time — consistently under 300ms even during peak hours when SAT's own portal crawls. They also return proper HTTP error codes when SAT is unreachable instead of just timing out, which makes retry logic much easier to implement.
One gotcha: make sure the provider distinguishes between "RFC not found" and "SAT temporarily unavailable." Some APIs return the same error for both, which caused false rejections in our pipeline until we switched.
Make sure whichever RFC taxpayer API you pick supports both persona física and persona moral lookups. We initially chose a provider that only handled individuals and had to scramble when our first corporate client applied. Also check if they expose the obligaciones fiscales — that field tells you a lot about whether the business is actually operating or just a shell registration.
We're building a digital lending platform targeting SMBs in Mexico and need an RFC taxpayer API that can handle real-time verification during the onboarding flow. The requirement is straightforward: user enters their RFC, we validate it against SAT records, confirm the taxpayer name matches, and pull the fiscal profile before moving them to the next step.
Our current manual process involves our ops team logging into the SAT portal, running the verification by hand, and copying the results into our system. This takes 5-10 minutes per applicant and doesn't scale beyond maybe 30 applications per day. We need this automated with an RFC taxpayer API that our Node.js backend can call programmatically.
Key requirements for the RFC taxpayer API integration:
We've looked at building this ourselves by scraping SAT's portal, but their CAPTCHAs and session management make that impractical for production use. Their official SOAP APIs require FIEL certificates which we don't want to manage for every client — we just need to verify third-party RFCs, not authenticate as those taxpayers.
Performance expectations: under 500ms response time for the validation call, 99%+ uptime, and graceful degradation when SAT itself is down (returning cached data with a staleness indicator). We're processing approximately 150-400 applications daily right now with plans to reach 1500+ within the year.
Budget is flexible but we prefer pay-per-query over monthly subscriptions since our volume fluctuates significantly. Has anyone implemented an RFC taxpayer API in production? What providers did you evaluate and what were the gotchas?