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Banking Access Index 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 Banking Access Index 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 Banking Access Index API.

Side by side

Banking Access Index APIEstimateTax API
What it doesWhich US business banking providers accept founders by country of residence, with sources.US federal, state and local income tax calculation for 2026, with the source of every figure.
ProviderGlobal SoloEstimateTax
API keyNot neededNot needed
HTTPSYesYes
CORS (browser calls)YesYes
Status todayOnline · 840 msOnline · 873 ms
Uptime (30 days)UpUp
Developer ratingNot rated yetNot rated yet
PriceFree / free tierFree / free tier
Banking Access Index docs ↗EstimateTax docs ↗

About each API

Banking Access Index logoBanking Access Index API

Which US business banking providers accept founders by country of residence, with sources.

Which US business banking providers accept non-US-resident founders of US LLCs: 19 providers × 8 countries of residence, 257 verified claims, every cell cited to a provider source. Free CC BY 4.0 dataset (CSV/JSON).

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.

Banking Access Index vs EstimateTax FAQ

Do Banking Access Index 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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