Free Finance APIs with no API key

33 Finance APIs that need no API key, account or credit card. 24 of them also allow CORS, so you can call them straight from browser JavaScript. Listed by uptime and ease of use.

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
16
Seiche API
Online · 812 ms
Free public funding, FX and capital-market evidence with source clocks.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
17
TickerInside API
Online · 838 ms
Holdings of every US ETF, which ETFs hold a stock, and overlap between funds, each dated.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
18
US Mortgage Calculator API
Online · 881 ms
Mortgage payment, amortization, affordability and 50-state property tax data.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
19L
LiquiLens API
Online · 1144 ms
Public-record bank and lender failure-risk evidence.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
20U
Undertow API
Online · 1070 ms
Public market-depth and sized exit estimates, not executable quotes.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
21
SEC EDGAR Data API
Online · 1935 ms
API to access annual reports of public US companies.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
22
XOOMAR API
Online · 923 ms
US market data from SEC, FINRA, CFTC and the Fed: filings, insiders, earnings dates, short interest.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
23
Zelothorn API
Online · 1260 ms
Plain-English explanations of US public companies with SEC filings and earnings data.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
24
Binlist API
Online · 716 ms
Public access to a database of IIN/BIN information.
- No API key needed
- HTTPS
No authHTTPSCORS ?
25
Fed Treasury API
Online · 736 ms
U.S. Department of the Treasury Data.
- No API key needed
- HTTPS
No authHTTPSCORS ?
26
Top 5 Stocks API
Online · 1083 ms
Daily AI-ranked stock and crypto watchlists.
- No API key needed
- HTTPS
No authHTTPSCORS ?
27
Goldprice.dev API
Online · 838 ms
Cross-validated gold, silver & copper spot, futures & 30-year history in 13 currencies.
- No API key needed
- HTTPS
No authHTTPSCORS ?
28I
Indian Mutual Fund API
Online · 1035 ms
Get complete history of India Mutual Funds Data.
- No API key needed
- HTTPS
No authHTTPSCORS ?
29
PolyKal Fees API
Online · 1862 ms
Kalshi & Polymarket trading fee rates and formulas as verified JSON.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
30
VoxOdds API
Online · 1079 ms
Polymarket and Kalshi odds, all-in executable quotes, EV checks and audited forecast scores.
- No API key needed
- HTTPS
No authHTTPSNo CORS
31
Razorpay IFSC API
Online · 1906 ms
Indian Financial Systems Code (Bank Branch Codes).
- No API key needed
- HTTPS
No authHTTPSCORS ?
32
WallstreetBets API
Online · 1707 ms
WallstreetBets Stock Comments Sentiment Analysis.
- No API key needed
- HTTPS
No authHTTPSCORS ?
33
KmalServico Gold Price Dataset API
Last check failed
Current gold price per gram at 6 purities for 188 countries, JSON, no auth.
- No API key needed
- HTTPS
No authHTTPSNo CORS

Keyless Finance APIs compared

Finance APIs with no API key
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
Helious	No	Yes	Yes	Up	559 ms	Not rated
IBAN Analyzer	No	Yes	Yes	Up	547 ms	Not rated
India GST HSN & SAC	No	Yes	Yes	Up	537 ms	Not rated
Nigeria PAYE	No	Yes	Yes	Up	1042 ms	Not rated
Portfolio Optimizer	No	Yes	Yes	Up	1006 ms	Not rated
Seiche	No	Yes	Yes	Up	812 ms	Not rated
TickerInside	No	Yes	Yes	Up	838 ms	Not rated
US Mortgage Calculator	No	Yes	Yes	Up	881 ms	Not rated
LiquiLens	No	Yes	Yes	Up	1144 ms	Not rated
Undertow	No	Yes	Yes	Up	1070 ms	Not rated
SEC EDGAR Data	No	Yes	Yes	Up	1935 ms	Not rated
XOOMAR	No	Yes	Yes	Up	923 ms	Not rated
Zelothorn	No	Yes	Yes	Up	1260 ms	Not rated
Binlist	No	Yes	Unknown	Up	716 ms	Not rated
Fed Treasury	No	Yes	Unknown	Up	736 ms	Not rated
Top 5 Stocks	No	Yes	Unknown	Up	1083 ms	Not rated
Goldprice.dev	No	Yes	Unknown	Up	838 ms	Not rated
Indian Mutual Fund	No	Yes	Unknown	Up	1035 ms	Not rated
PolyKal Fees	No	Yes	Yes	Up	1862 ms	Not rated
VoxOdds	No	Yes	No	Up	1079 ms	Not rated
Razorpay IFSC	No	Yes	Unknown	Up	1906 ms	Not rated
WallstreetBets	No	Yes	Unknown	Up	1707 ms	Not rated
KmalServico Gold Price Dataset	No	Yes	No	Down	–	Not rated

FAQ

Are there free Finance APIs without an API key?

Yes. 33 free Finance APIs need no API key or sign-up, including Econdb API, Helium API and Banking Access Index API. You can send a request straight away.

Which keyless Finance APIs can I call from JavaScript in the browser?

24 of them also support CORS, including Econdb API, Helium API and Banking Access Index API, so a plain fetch from a web page works.

Do APIs without a key have limits?

Usually, yes. Keyless APIs typically rate-limit by IP address, so cache responses and avoid tight loops. For production traffic, an API with a free key tier often gives higher, more predictable limits.