Best Finance APIs in 2026

The top 15 of 96 free Finance APIs, ranked by how easy they are to start with (API key, HTTPS, CORS), how reliable they are in our daily health checks, and what developers rate them. Econdb API takes the top spot.

Last tested Oct 24, 2026 · Rankings update daily

1
Econdb API
Online · 802 ms
Download economic and shipping data using Python.
- No API key needed
- Returns JSON at its URL
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
2
Helium API
Online · 377 ms
News with media bias scoring, balanced news synthesis, live market data, AI options pricing.
- No API key needed
- Fast: 377 ms response
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
3
Banking Access Index API
Online · 840 ms
Which US business banking providers accept founders by country of residence, with sources.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
4
Brainy Prices API
Online · 520 ms
UAE living costs: KHDA fees, DLD rents, fuel, utilities, telecom and relocation, with dated sources.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
5
CardBinCheck API
Online · 822 ms
Card BIN/IIN lookup: network, issuer, country and card type for the first 6-8 digits.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
6
contix API
Online · 746 ms
Spain: IBAN validation with bank and BIC, EU VAT number check (VIES), Modelo 303 VAT sums.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
7
EstimateTax API
Online · 873 ms
US federal, state and local income tax calculation for 2026, with the source of every figure.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
8
Finance Clearly Tax Rates API
Online · 872 ms
Current UK and US tax rates, allowances and thresholds.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
9
FloorGuard API
Online · 706 ms
Sourced prop firm daily-loss and max-drawdown rules, plus a drawdown-room check.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
10
Futures Clock API
Online · 578 ms
Trading hours and session windows for 65 futures products on 16 global exchanges.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
11
Helious API
Online · 559 ms
US Treasury auction results with the tail and bidder split, plus scored economic releases.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
12
IBAN Analyzer API
Online · 547 ms
Resolve an IBAN to its bank name, BIC, city and address for 60+ countries.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
13
India GST HSN & SAC API
Online · 537 ms
Indian GST HSN and SAC classification code lookup and search.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
14
Nigeria PAYE API
Online · 1042 ms
Nigerian income tax (PAYE) and take-home pay under the Nigeria Tax Act 2025.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
15
Portfolio Optimizer API
Online · 1006 ms
The Nobel Prize-winning science of portfolio optimization, available as a Web API.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS

Finance APIs compared

Top Finance APIs compared
API	API key	HTTPS	CORS	Uptime	Response	Rating
Econdb	No	Yes	Yes	Up	802 ms	Not rated
Helium	No	Yes	Yes	Up	377 ms	Not rated
Banking Access Index	No	Yes	Yes	Up	840 ms	Not rated
Brainy Prices	No	Yes	Yes	Up	520 ms	Not rated
CardBinCheck	No	Yes	Yes	Up	822 ms	Not rated
contix	No	Yes	Yes	Up	746 ms	Not rated
EstimateTax	No	Yes	Yes	Up	873 ms	Not rated
Finance Clearly Tax Rates	No	Yes	Yes	Up	872 ms	Not rated
FloorGuard	No	Yes	Yes	Up	706 ms	Not rated
Futures Clock	No	Yes	Yes	Up	578 ms	Not rated

More Finance APIs

Best Finance API FAQ

What is the best free Finance API in 2026?

Based on access, reliability and developer ratings, the top free Finance APIs right now are Econdb API, Helium API and Banking Access Index API. Econdb API ranks first. Rankings update daily from health checks of all 96 Finance APIs in the directory.

What is the best Finance API without an API key?

Econdb API, Helium API and Banking Access Index API need no API key, so you can call them without signing up. 33 of the 96 ranked Finance APIs are keyless.

Which Finance API works from the browser?

Econdb API, Helium API and Banking Access Index API support CORS over HTTPS, so front-end JavaScript can call them directly without a proxy.

How are these APIs ranked?

Each API gets a score from: no API key (+), HTTPS (+), CORS support (+), 30-day uptime and response time from our daily health checks, and ratings from developers on this site. APIs that failed three checks in a row are left out until they recover.