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CardBinCheck API vs EstimateTax API

Two free Finance APIs compared on access, reliability and developer ratings, using data from our daily health checks.

The verdict

  • Choose CardBinCheck API if its data fits your use case better; on access and reliability it's level with EstimateTax API.
  • Choose EstimateTax API if its data fits your use case better; on access and reliability it's level with CardBinCheck API.

Side by side

CardBinCheck APIEstimateTax API
What it doesCard BIN/IIN lookup: network, issuer, country and card type for the first 6-8 digits.US federal, state and local income tax calculation for 2026, with the source of every figure.
ProviderCardBinCheckEstimateTax
API keyNot neededNot needed
HTTPSYesYes
CORS (browser calls)YesYes
Status todayOnline · 822 msOnline · 873 ms
Uptime (30 days)UpUp
Developer ratingNot rated yetNot rated yet
PriceFree / free tierFree / free tier
CardBinCheck docs ↗EstimateTax docs ↗

About each API

CardBinCheck logoCardBinCheck API

Card BIN/IIN lookup: network, issuer, country and card type for the first 6-8 digits.

Free BIN lookup API with no API key and no registration. GET /api/bin/{bin} returns JSON with the card network, issuing bank, country, and funding type. 343,000+ BIN records, CORS enabled, 100 requests/day free.

Strengths

  • No API key needed
  • Callable from the browser (CORS)
  • HTTPS

Ratings, reviews and FAQ →

EstimateTax logoEstimateTax API

US federal, state and local income tax calculation for 2026, with the source of every figure.

A REST API for US federal, state and local income tax calculation for 2026. Deterministic, source-attributed responses, no key required, 60 requests a minute.

Strengths

  • No API key needed
  • Callable from the browser (CORS)
  • HTTPS

Ratings, reviews and FAQ →

How to choose between them

  • Prototyping or a tutorial? Pick the one that needs no API key (both qualify).
  • Calling from a web page? You need CORS. Otherwise route requests through your own server or a serverless function.
  • Going to production? Favour HTTPS, a strong uptime record and a provider with clear rate limits and terms. Check each API's docs before you commit.
  • Still unsure? Both are free to try: send one request to each and compare the data you get back.

CardBinCheck vs EstimateTax FAQ

Do CardBinCheck API and EstimateTax API need an API key?

Neither needs an API key; you can call both straight away.

More comparisons

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