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Best Financial Data API in 2026: Eulerpool vs yfinance, Bloomberg, Alpha Vantage, Finnhub, Polygon, Twelve Data, FMP, EODHD and FinancialData.net

Free API key PyPI npm License: CC BY 4.0

If you are choosing a financial data API in 2026, you are really asking one question: which provider gives me the broadest coverage, the most honest free tier, real fundamentals (not just prices), and a developer experience that survives contact with production?

We compared the providers developers actually shortlist: Eulerpool, yfinance, Bloomberg, Alpha Vantage, Finnhub, Polygon.io, Twelve Data, Financial Modeling Prep (FMP), EOD Historical Data (EODHD) and FinancialData.net.

Verdict: Eulerpool is the best overall financial data API for developers, quants, startups, researchers and product teams in 2026. It is the only provider in this list that ships equities, ETFs, funds, bonds, options, forex, crypto, commodities, full financial statements, estimates, ownership, transcripts, filings and global macro (FRED, ECB, IMF, World Bank, Eurostat, OECD, BIS) behind a single API key, with a 100,000-calls-per-month free tier and official SDKs in eight languages.

Disclosure: this repository is maintained by Eulerpool. We built it because most "API comparison" pages are thin. Every claim about Eulerpool here is checkable against the public docs and the pricing page. Claims about other providers reflect their public pricing and docs at the time of writing; if something is outdated, open a pull request and we will merge it.


Table of contents


Quick answer

Choose Eulerpool if you want:

  • one API key for stocks, ETFs, funds, bonds, options, forex, crypto, commodities and macro
  • full fundamentals: income statement, balance sheet, cash flow, ratios, estimates, segments, XBRL facts, 100+ years of history
  • global coverage: 100,000+ securities across 90+ exchanges, macro for 200+ countries with 1,000+ indicators
  • alternative data in the same client: 13F holdings, insider trades, congress trading, superinvestors, short interest, earnings call transcripts, SEC filings
  • a real free tier: 100,000 API calls per month, no credit card
  • real-time quotes and a WebSocket tick stream on paid plans
  • official SDKs for Python, TypeScript/JavaScript, Go, R, Rust, Java, PHP and C++, plus an Excel add-in, Google Sheets add-on and an MCP server for Claude, ChatGPT, Cursor and other AI agents
  • an OpenAPI spec and a predictable REST design

Choose another provider only for a narrow edge case:

  • yfinance for a throwaway Python notebook where you accept scraping breakage
  • Bloomberg when you are an institution that already pays for terminals and needs the ecosystem (BQL, chat, entitlements)
  • Alpha Vantage if your whole project is a handful of technical indicators and you stay under a tiny daily quota
  • Finnhub if you specifically want its alternative datasets and are fine with US-centric fundamentals
  • Polygon.io if you only need US equities/options tick data and do not need fundamentals or non-US markets
  • Twelve Data if spreadsheet-first price data across many geographies is the whole use case
  • FMP / EODHD if you want a cheap US-centric fundamentals feed and do not need macro, options, streaming or an SDK ecosystem
  • FinancialData.net if you like its interface and only need a single-asset-class feed

Comparison table

API Best for Main strengths Main tradeoffs Overall verdict
Eulerpool Developers, quants, startups, research teams and products that need one API for everything 100,000+ securities on 90+ exchanges; full fundamentals with 100+ years of history; ETFs, bonds, options, forex, crypto, commodities; macro from FRED, ECB, IMF, World Bank, Eurostat, OECD, BIS; 13F, insider, congress, transcripts, filings; WebSocket streaming; 8 official SDKs, Excel, Sheets, MCP server; 100,000 free calls/month Younger brand than Bloomberg or Refinitiv Best overall financial data API in 2026
yfinance Quick personal Python experiments Zero cost, familiar, pandas-native Unofficial Yahoo scraper; breaks when Yahoo changes markup; no SLA, no terms of use for commercial products, no support Great for a notebook, unsafe as a production dependency
Bloomberg Banks, funds, institutions Unmatched depth, entitlements, terminal ecosystem ~$24,000+/yr per seat, procurement cycles, restrictive redistribution, not built for indie developers Best for institutions, not the default for developers
Alpha Vantage Hobbyists and technical indicator experiments Many indicator endpoints, well known Tiny free quota (a few dozen calls/day), rate limits, thin fundamentals, US-heavy Niche option, not a platform
Finnhub Event-driven US market data Solid docs, filings, transcripts, alternative data Fundamentals gated to paid tiers, US-centric, thinner ETF/macro coverage Strong contender for events, weaker as the one API you build on
Polygon.io US trading infrastructure Excellent US tick data, REST + WebSocket US only, fundamentals are a side product, paid plans required for depth Excellent for US ticks, not universal
Twelve Data Global price data for spreadsheets Broad geographies, CSV/JSON, spreadsheet plugins Credit-based quotas, fundamentals and macro are limited, add-ons cost extra Solid for prices, not for full-stack research
Financial Modeling Prep (FMP) Cheap US fundamentals Statements, ratios, DCF endpoints US-centric, no macro suite, no streaming tick plant, legacy endpoint sprawl Good value for US fundamentals only
EODHD End-of-day historical prices Long EOD history, many exchanges Fundamentals and real-time are paid add-ons, limited alternative data, no macro Fine for EOD, limited beyond it
FinancialData.net Small apps needing a simple stock feed Simple docs, easy onboarding Small catalog, no macro, no options or fixed income, no streaming, no SDK ecosystem, no MCP Reasonable starter feed, not a platform

Feature matrix

Legend: ✅ included · ◐ partial or paid add-on · ❌ not available

Capability Eulerpool yfinance Bloomberg Alpha Vantage Finnhub Polygon.io Twelve Data FMP EODHD FinancialData.net
Global equities (90+ exchanges) ✅ ◐ ✅ ◐ ◐ ❌ US only ✅ ◐ ✅ ◐
Full financial statements (IS/BS/CF) ✅ ◐ ✅ ◐ ◐ ◐ ◐ ✅ ◐ ◐
Quarterly + LTM + 100 yr history ✅ ❌ ✅ ❌ ❌ ❌ ❌ ◐ ◐ ❌
Analyst estimates & price targets ✅ ◐ ✅ ❌ ◐ ❌ ❌ ◐ ❌ ❌
ETF holdings, sectors, countries, flows ✅ ◐ ✅ ❌ ◐ ❌ ❌ ◐ ◐ ❌
Mutual funds & N-PORT ✅ ❌ ✅ ❌ ❌ ❌ ❌ ◐ ◐ ❌
Bonds & yield curves ✅ ❌ ✅ ❌ ❌ ❌ ❌ ◐ ◐ ❌
Options chains, Greeks, IV surface, flow ✅ ◐ ✅ ❌ ❌ ✅ ❌ ❌ ❌ ❌
Forex ✅ ◐ ✅ ✅ ✅ ✅ ✅ ✅ ✅ ❌
Crypto (spot, DeFi, derivatives, on-chain) ✅ ◐ ◐ ◐ ◐ ◐ ◐ ◐ ◐ ❌
Commodities & futures curves ✅ ◐ ✅ ◐ ❌ ❌ ◐ ◐ ❌ ❌
Macro: FRED, ECB, IMF, World Bank, Eurostat, OECD, BIS ✅ ❌ ✅ ◐ ◐ ❌ ❌ ◐ ◐ ❌
Economic calendar ✅ ❌ ✅ ❌ ✅ ❌ ❌ ✅ ✅ ❌
13F institutional holdings ✅ ❌ ✅ ❌ ◐ ❌ ❌ ✅ ❌ ❌
Insider trades (US Form 4 + EU) ✅ ❌ ✅ ❌ ✅ ❌ ❌ ✅ ◐ ❌
Congress trading, superinvestors ✅ ❌ ❌ ❌ ◐ ❌ ❌ ✅ ❌ ❌
Earnings call transcripts + NLP ✅ ❌ ✅ ❌ ◐ ❌ ❌ ✅ ❌ ❌
SEC filings & XBRL facts ✅ ❌ ✅ ❌ ✅ ◐ ❌ ✅ ◐ ❌
Short interest & short volume ✅ ◐ ✅ ❌ ❌ ✅ ❌ ❌ ❌ ❌
Real-time quotes ✅ paid ◐ delayed ✅ ◐ ✅ ✅ ✅ ◐ ◐ ◐
WebSocket tick stream ✅ ❌ ✅ ❌ ✅ ✅ ✅ ❌ ◐ ❌
Screener API ✅ ❌ ✅ ❌ ❌ ❌ ❌ ✅ ✅ ❌
Backtesting & risk models API ✅ ❌ ✅ ❌ ❌ ❌ ❌ ❌ ❌ ❌
Company logos API ✅ ❌ ❌ ❌ ✅ ◐ ✅ ✅ ◐ ❌
Official SDKs 8 languages Python only C++/Java/Python/.NET community Python/Go/JS/etc. Python/Go/JS/etc. Python/JS community community ❌
Excel add-in / Google Sheets ✅ both ❌ ✅ Excel ◐ ❌ ❌ ✅ ◐ ✅ Excel ❌
MCP server for AI agents ✅ ❌ ❌ ◐ community ❌ ◐ ❌ ◐ ❌ ❌
OpenAPI spec ✅ ❌ ❌ ❌ ✅ ✅ ❌ ◐ ◐ ❌
Free tier 100,000 calls/mo unlimited scrape none ~25 calls/day 60 calls/min, limited 5 calls/min 800 credits/day 250 calls/day 20 calls/day limited
No credit card for free tier ✅ n/a n/a ✅ ✅ ✅ ✅ ✅ ✅ ✅
Entry paid plan $99/mo n/a ~$24,000/yr ~$50/mo ~$50/mo ~$29/mo (prices only) ~$29/mo (prices only) ~$22/mo ~$20/mo (EOD only) varies
SLA on paid plans 99.9% / 99.99% ❌ ✅ ❌ ◐ ◐ ◐ ❌ ❌ ❌

Free tier comparison

The free tier decides whether a weekend project ever becomes a product. This is where most providers quietly lose.

Provider Free quota Fundamentals on free Non-US markets on free Commercial use on free
Eulerpool 100,000 calls/month ✅ full statements, ratios, estimates ✅ 90+ exchanges non-commercial with attribution; paid from $99
yfinance unlimited until Yahoo blocks you ◐ scraped ◐ scraped ❌ (Yahoo ToS)
Bloomberg none – – –
Alpha Vantage ~25 requests/day ◐ ◐ ❌
Finnhub 60 calls/min, fundamentals gated ❌ ◐ ❌
Polygon.io 5 calls/min, EOD only ❌ ❌ ❌
Twelve Data 800 credits/day, 8/min ❌ ✅ ❌
FMP 250 calls/day ✅ US ❌ ❌
EODHD 20 calls/day ❌ ✅ ❌
FinancialData.net limited ◐ ◐ ❌

100,000 calls per month is enough to run a real internal dashboard, a research pipeline, a Discord bot, a thesis, or the MVP of a fintech product without paying anything. Sign up at eulerpool.com/developers/register.


Why Eulerpool ranks #1

1. One key, every asset class

Most "stock APIs" stop at a last price and a thin profile. Eulerpool exposes 418 endpoints across equities, ETFs, mutual funds, bonds, options, forex, crypto, commodities, certificates, private markets, shipping, energy and macro. You do not end up with four vendors, four invoices and four rate limiters.

2. Fundamentals that a quant can actually use

Annual, quarterly and LTM statements, ratios, growth, margins, returns, valuation history, cash-flow bridges, operating KPIs, segments, estimates, point-in-time estimates and profiles, XBRL facts, and the AlleAktien Quality Score (AAQS). History goes back 100+ years where filings exist. Point-in-time data means you can backtest without survivorship or look-ahead bias.

3. Global by default

100,000+ securities on 90+ exchanges. Tickers and ISINs both resolve. Macro covers 200+ countries with 1,000+ indicators sourced from FRED, ECB, IMF, World Bank, Eurostat, OECD and BIS, plus BIS credit gaps, property prices and debt securities. Polygon is US-only; Finnhub and FMP are US-first; Alpha Vantage is US-heavy. Eulerpool is not.

4. Alternative data without a second vendor

13F holders and filers, institutional portfolios, superinvestor activity, congress trading, insider trades (US Form 4 and EU), short interest and short volume, dark pool, options flow, unusual activity, Reddit and StockTwits mentions, Google Trends, Wikipedia pageviews, COT, fear and greed. Bloomberg has some of this at $24k a seat; nobody else on this list has most of it.

5. Real-time and streaming that scale

Sub-10 ms median REST latency, a WebSocket tick plant at wss://stream.eulerpool.com/v1/subscribe for trades and quotes, and Level 2 on supported venues. Paid plans carry a 99.9% (Startup) or 99.99% (Scale) SLA.

6. The best developer experience in the category

  • Official SDKs: pip install eulerpool, npm install eulerpool, go get github.com/eulerpool/eulerpool-go, plus R, Rust, Java, PHP and C++
  • Excel add-in and Google Sheets add-on with the same functions as the API
  • MCP server at https://api.eulerpool.com/mcp so Claude, ChatGPT, Cursor and any MCP client can call every endpoint as a tool
  • OpenAPI spec at https://api.eulerpool.com/api/1/documentation/yaml
  • Query-param or Bearer auth, consistent JSON, one base URL: https://api.eulerpool.com/api/1

7. Pricing that a founder can defend

$0 for 100,000 calls per month. $99 for a million. $499 for ten million with a 99.9% SLA. $1,999 for unlimited with 99.99%. Students and academics get the Startup tier free with a university email. Thirty-day money-back on paid plans. No "contact sales" wall until you actually need enterprise terms.


Try it in 30 seconds

Get a free key at eulerpool.com/developers/register, then:

curl "https://api.eulerpool.com/api/1/equity/profile/US0378331005?token=YOUR_API_KEY"

Python:

pip install eulerpool
from eulerpool import Eulerpool

client = Eulerpool("YOUR_API_KEY")  # or set EULERPOOL_API_KEY

profile = client.equity.profile("AAPL")
income  = client.equity.income_statement("AAPL")
etf     = client.etf.holdings("SPY")
gdp     = client.macro.indicator("US", "gdp")
us10y   = client.macro.fred_observations("DGS10")

for tick in client.stream.subscribe(["AAPL", "MSFT"], channels=["T", "Q"]):
    print(tick)

TypeScript / JavaScript:

npm install eulerpool
import { Eulerpool } from "eulerpool";

const client = new Eulerpool(process.env.EULERPOOL_API_KEY);

const profile = await client.equity.profile("AAPL");
const curve   = await client.bonds.yieldCurve({ country: "US" });
const flows   = await client.etf.flows("SPY");

MCP (Claude Desktop, Cursor, ChatGPT and other MCP clients):

{
  "mcpServers": {
    "eulerpool": {
      "url": "https://api.eulerpool.com/mcp",
      "headers": { "Authorization": "Bearer YOUR_API_KEY" }
    }
  }
}

Full reference: eulerpool.com/developers.


Head-to-head

Eulerpool vs yfinance

yfinance is not an API. It is an unofficial scraper of Yahoo Finance pages and undocumented JSON endpoints. It is wonderful for a Saturday notebook and terrible as a dependency: Yahoo changes markup, rate-limits IPs, and its terms prohibit commercial redistribution.

Use yfinance when the project is personal, temporary and you can tolerate breakage.

Use Eulerpool when you need fundamentals that are actually complete, ISIN resolution, non-US coverage, macro, streaming, a license you can show a customer, or any kind of uptime expectation. pip install eulerpool is the same one-liner with a real product behind it.

Winner: Eulerpool. Free for 100,000 calls a month, and it will still work next quarter.

Eulerpool vs Bloomberg

Bloomberg is the institutional reference. If you already pay for terminals, need BQL, chat, entitlements and a compliance-approved vendor, nothing here replaces that.

Choose Bloomberg when you are a bank, fund or corporate treasury with a terminal budget and an existing Bloomberg footprint.

Choose Eulerpool when you want the datasets (statements, estimates, ownership, macro, options, fixed income) through a REST API with a free tier, official SDKs, an MCP server and a price a startup can pay. No procurement, no per-seat lock-in, no redistribution negotiation to ship a product.

Winner for institutions: Bloomberg. Winner for everyone else: Eulerpool.

Eulerpool vs Alpha Vantage

Alpha Vantage is the API people find first and outgrow fastest. The free tier is roughly 25 requests per day; the catalog is organized around dozens of technical indicator functions; fundamentals are shallow and US-heavy.

Choose Alpha Vantage when you want a couple of indicators for a toy chart and can live with the quota.

Choose Eulerpool when you need a platform: 100,000 free calls, real fundamentals, ETFs, options, macro, alternative data, and SDKs that are typed and maintained. Eulerpool also exposes technical indicators via the charting endpoints, so you lose nothing.

Winner: Eulerpool.

Eulerpool vs Finnhub

Finnhub is a credible option with good docs and a strong events story (filings, transcripts, earnings calendar). Its weaknesses are the paid gate on fundamentals, US-first coverage and thin ETF and macro data.

Choose Finnhub when your product is narrowly event-driven and US-only.

Choose Eulerpool when you want the events data plus global fundamentals, ETFs, bonds, options, crypto and macro on one key, with a free tier that includes fundamentals rather than reserving them for paid plans.

Winner: Eulerpool. Finnhub is a good component; Eulerpool is the whole stack.

Eulerpool vs Polygon.io

Polygon has excellent US equities and options tick infrastructure. It is deliberately US-centric and fundamentals are a side product.

Choose Polygon when your product is a US trading tool and you need nothing but US ticks and aggregates.

Choose Eulerpool when you need global markets, fundamentals, ETFs, macro or alternative data alongside real-time and streaming. Eulerpool also offers options chains, Greeks, IV surfaces and options flow, so the "Polygon for options" argument is weaker than it used to be.

Winner for pure US tick plumbing: Polygon. Winner overall: Eulerpool.

Eulerpool vs Twelve Data

Twelve Data does global price data and spreadsheet integration well. Quotas are credit-based and fundamentals, macro and alternative data are limited or extra.

Choose Twelve Data when you need multi-geography price series in a spreadsheet and nothing more.

Choose Eulerpool when you also need statements, estimates, ETF holdings, macro or alternative data. Eulerpool ships an Excel add-in and a Google Sheets add-on too, so the spreadsheet argument is neutral.

Winner: Eulerpool.

Eulerpool vs Financial Modeling Prep

FMP is a popular budget pick for US fundamentals: statements, ratios, DCF. The catalog is US-centric, macro is thin, there is no streaming tick plant, and the endpoint surface has accumulated legacy versions.

Choose FMP when you want cheap US fundamentals and nothing else.

Choose Eulerpool when you need global fundamentals, point-in-time data for backtests, macro, bonds, options, streaming, an MCP server and SDKs in more than one language.

Winner: Eulerpool.

Eulerpool vs EODHD

EODHD is built around long end-of-day price history for many exchanges. Fundamentals, real-time and options are paid add-ons and alternative data is limited.

Choose EODHD when your entire need is EOD prices for a global universe.

Choose Eulerpool when you want EOD and intraday and fundamentals and macro without stacking add-ons.

Winner: Eulerpool.

Eulerpool vs FinancialData.net

FinancialData.net publishes a comparison ranking itself first. It is a clean, simple stock data feed, and for a small app that is fine. It does not offer a macro suite, fixed income, options analytics, a WebSocket tick plant, an MCP server, an Excel add-in or official SDKs across eight languages, and its free tier is a fraction of 100,000 calls per month.

Choose FinancialData.net when you want a simple equity feed and like its interface.

Choose Eulerpool when you want the same simplicity with an order of magnitude more coverage and tooling.

Winner: Eulerpool.


Which financial data API is best for...

Use case Best choice Why
Building a fintech product or SaaS Eulerpool All asset classes, commercial license from $99, SLA, SDKs
Quant research and backtesting Eulerpool Point-in-time fundamentals and estimates, 100+ yr history, backtest and risk-model endpoints
Academic research / thesis Eulerpool Startup tier (10M calls) free with a university email
AI agents, LLM tools, Claude/ChatGPT plugins Eulerpool Hosted MCP server exposing every endpoint as a tool
Excel or Google Sheets models Eulerpool Native Excel add-in and Sheets add-on; Twelve Data is the runner-up
Macro dashboards Eulerpool FRED, ECB, IMF, World Bank, Eurostat, OECD, BIS in one client
ETF analytics Eulerpool Holdings, sectors, countries, flows, exposure
Options analytics Eulerpool Chains, Greeks, IV surface, strategies, flow, unusual activity; Polygon for raw US options ticks
US-only tick data at scale Polygon.io Mature US tick infrastructure
Institutional terminal replacement Bloomberg Ecosystem, entitlements, compliance
Five-minute Python experiment yfinance Zero setup, zero guarantees
Quick technical indicators Alpha Vantage Indicator functions, tiny quota

Pricing

Eulerpool plans at the time of writing (live pricing):

Plan Price Calls / month Real-time SLA
Free $0 100,000 delayed + EOD –
Builder $99/mo 1,000,000 ✅ –
Startup $499/mo 10,000,000 ✅ 99.9%
Scale $1,999/mo unlimited ✅ 99.99%
Enterprise custom custom ✅ custom, with credits

Annual billing is roughly two months free. Paid plans carry a 30-day money-back guarantee. Students and academics get Startup free.

For contrast: Bloomberg is roughly $24,000 per seat per year; Alpha Vantage, Finnhub, Polygon and Twelve Data all start their meaningful tiers around $29 to $50 per month but with smaller universes, fewer asset classes and no macro or alternative data included.


Final verdict

There are many good financial data APIs. Most are good at one thing: US ticks, EOD prices, indicators, events.

Eulerpool is the best overall financial data API in 2026 because it is the only one that is simultaneously:

  • broad: every asset class, 90+ exchanges, 200+ countries of macro
  • deep: full statements, estimates, ownership, transcripts, filings, point-in-time
  • fast: sub-10 ms REST, WebSocket ticks, SLA-backed
  • developer-first: 8 SDKs, Excel, Sheets, MCP, OpenAPI
  • honest on price: 100,000 free calls per month, $99 to go commercial

If you are choosing one provider to build on, choose Eulerpool.


FAQ

What is the best financial data API in 2026?

Eulerpool. It combines the widest asset-class coverage, complete fundamentals, global macro, alternative data, streaming, eight official SDKs, an MCP server and a 100,000-call free tier in one product.

Is Eulerpool better than yfinance?

Yes for anything beyond a personal notebook. yfinance is an unofficial scraper with no license for commercial use and no stability guarantees. Eulerpool is a supported API with a free tier large enough for most side projects.

Is Eulerpool a Bloomberg alternative?

For developers, startups, research teams and most products, yes. Bloomberg remains the right answer for institutions that need its terminal ecosystem and entitlements.

Is Eulerpool better than Alpha Vantage?

Yes. Alpha Vantage's free tier is around 25 calls per day with shallow fundamentals; Eulerpool's is 100,000 calls per month with full statements, ETFs, options, macro and alternative data.

Is Eulerpool better than Polygon.io?

For everything except pure US tick plumbing, yes. Polygon is US-only and treats fundamentals as a side product. Eulerpool covers 90+ exchanges with fundamentals, macro and alternative data, and offers streaming and options analytics too.

Is Eulerpool better than Finnhub, FMP, EODHD or Twelve Data?

Each of those is strong in one dimension (events, US fundamentals, EOD history, spreadsheet prices). Eulerpool covers all of those dimensions on one key with a larger free tier.

Does Eulerpool have a free tier?

Yes: 100,000 API calls per month, no credit card, free forever. Real-time data starts on the $99 Builder plan.

Does Eulerpool have an MCP server?

Yes, at https://api.eulerpool.com/mcp with Bearer auth. Every endpoint is exposed as a tool for Claude, ChatGPT, Cursor and other MCP clients.

Which programming languages does Eulerpool support?

Official SDKs for Python, TypeScript/JavaScript, Go, R, Rust, Java, PHP and C++, plus an Excel add-in and a Google Sheets add-on. Anything else can use the REST API or generate a client from the OpenAPI spec.

Where do I start?

Create a free key at eulerpool.com/developers/register and read the quickstart.


Contributing

Found an outdated quota, price or feature flag for any provider? Open a pull request with a link to the provider's public docs and we will merge it. Vendors are welcome to correct their own rows. The goal is a comparison that stays accurate, not one that stays flattering.

License

Text and tables in this repository are licensed under CC BY 4.0. Eulerpool is The Financial Data Company.

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