Fundamental Data API: How to Extract Stock, ETF, Index, Mutual Fund, and Crypto Data (Step-by-Step Guide)
If you’ve ever tried to build a serious financial product, screener, dashboard, or data pipeline, you already know the uncomfortable truth:
Getting financial data is easy.
Getting reliable fundamental data is not.
Most projects start the same way:
“Let’s pull data from Yahoo Finance.”“This API is free, good enough for now.”“We’ll fix it later.”
Then reality hits:
Endpoints break without warningScrapers get blockedETFs have no holdingsIndices have no historical constituentsCrypto has prices but zero context
At that point, the problem is no longer technical.
It’s architectural.
That’s why choosing the right Fundamental Data API matters.
What Is a Fundamental Data API?
A Fundamental Data API provides structured, long-term financial information about assets, not just prices.
Unlike market data APIs (OHLC, ticks, volume), fundamental data answers deeper questions:
What does this company actually do?How does it make money?What is inside this ETF?Which companies were in this index in the past?What is the real structure behind a crypto project?
What Counts as Fundamental Data?
Stocks
Company profile (sector, industry, country)Financial statements (Income, Balance Sheet, Cash Flow)Valuation ratios (P/E, margins, ROE, ROA)Dividends and splitsMarket capitalization and key metrics
ETFs
ETF metadata (issuer, category, AUM)Holdings and weightsSector and geographic exposure
Mutual Funds
Fund profile and strategyAssets under managementFinancial history
Indices
ConstituentsWeightsHistorical changes (critical for backtesting)
Crypto
Project metadataSupply and market capitalizationOfficial links (website, GitHub, whitepaper)Ecosystem statistics
What Is Derived Fundamental Data?
Derived data is what you build on top of fundamentals.
Examples:
Fundamental scoring modelsCompany or ETF rankingsQuality or value factorsSector or exposure analysis
Derived data is only as good as the raw fundamental data behind it.
If the base data is inconsistent, your models will be too.
Why Popular Solutions Fail at Fundamental Data
Yahoo Finance (scraping)
❌ No official API❌ Frequent HTML changes❌ Blocking and rate limits❌ Not suitable for commercial products
Trading-focused APIs (brokers)
❌ Built for order execution❌ Limited or missing fundamentals❌ Poor ETF, index, and global coverage
Alpha Vantage
✅ Easy to start❌ Strict rate limits❌ Limited ETF and index depth❌ Difficult to scale for real products
These tools work for experiments, not for systems.
Why Choose EODHD APIs for Fundamental Data
This is an architectural decision, not a feature checklist.
Key Advantages
Single fundamental endpoint for multiple asset classesGlobal market coverage, not US-onlyConsistent JSON structure, ideal for normalizationNative crypto fundamentals via a virtual exchange (.CC)Designed for data products, ETL, and SaaS
EODHD APIs scale from scripts to full platforms without changing your data model.
Fundamental Data API Endpoint (Core Concept)
GET https://eodhd.com/api/fundamentals/{SYMBOL}?api_token=YOUR_API_KEY&fmt=json
Symbol examples:
Stock: AAPL.USETF: SPY.USMutual fund: SWPPX.USCrypto: BTC-USD.CC
Python Setup (Reusable)
import requests
import os
API_KEY = os.getenv(“EODHD_TOKEN”)
BASE_URL = “https://eodhd.com/api”
def get_fundamentals(symbol):
url = f”{BASE_URL}/fundamentals/{symbol}”
r = requests.get(url, params={
“api_token”: API_KEY,
“fmt”: “json”
})
r.raise_for_status()
return r.json()
How to Extract Stock Fundamental Data Using an API
stock = get_fundamentals(“AAPL.US”)
print(stock[“General”][“Name”])
print(stock[“Highlights”][“MarketCapitalization”])
print(stock[“Valuation”][“TrailingPE”])
Use cases
Stock screenersValuation modelsFundamental scoring systems
How to Extract ETF Data Using an API
ETFs require look-through analysis, not just price tracking.
etf = get_fundamentals(“SPY.US”)
print(etf[“General”][“Name”])
print(etf[“ETF_Data”][“Holdings”].keys())
Use cases
Portfolio exposure analysisBacktesting without hidden biasWealth and advisory platforms
How to Extract Mutual Fund Data Using an API
fund = get_fundamentals(“SWPPX.US”)
print(fund[“General”][“Name”])
Use cases
Fund comparison toolsAutomated reportingWealth management dashboards
How to Extract Index Data Using an API
Indices are not just numbers.
Correct index analysis requires:
ConstituentsWeightsHistorical changes
Using current constituents for past analysis introduces look-ahead bias.
Recommended workflow
Pull index constituents (current or historical)Enrich each component with fundamentalsCompute derived metrics
This is essential for:
Quant modelsFactor researchLong-term backtesting
How to Extract Crypto Fundamental Data Using an API
Crypto fundamentals are project-level, not just price-based.
btc = get_fundamentals(“BTC-USD.CC”)
print(btc[“General”][“Name”])
print(btc[“Statistics”][“MarketCapitalization”])
print(btc[“Resources”][“Links”][“source_code”])
Use cases
Crypto research dashboardsProject comparison toolsHybrid equity + crypto platforms
How to Integrate Fundamental Data Into Real Systems
Typical integrations:
ETL → PostgreSQL, BigQueryAutomation → n8n, AirflowDashboards → Streamlit, MetabaseReporting → Google Sheets, Notion
Recommended architecture
Fetch fundamentalsCache by symbol (daily or weekly)Normalize only required fieldsCompute derived metricsServe data to applications
Pros and Cons of a Professional Fundamental Data API
Pros
Stable and structured dataMulti-asset supportScales to productionIdeal for derived analytics
Cons
Requires data modelingNot a copy-paste shortcut
That’s a feature, not a drawback.
FAQs — Fundamental Data APIs
What is fundamental data?
Economic and structural information about an asset, not its price.
What is derived fundamental data?
Metrics or scores calculated from raw fundamental data.
Can I combine stocks, ETFs, indices, and crypto?
Yes. That’s one of the main strengths of EODHD APIs.
How often should I update fundamental data?
Stocks: quarterlyETFs and funds: monthlyCrypto: more frequently
Is fundamental data suitable for SaaS products?
Yes, when sourced from an official and stable API.
If you’re looking for a Fundamental Data API that lets you:
Extract stock, ETF, mutual fund, index, and crypto databuild reliable derived financial datascale from scripts to real products
Then EODHD APIs provide a clean and professional foundation.
Access the EODHD Fundamental Data API with a discount:
Fundamental Data API: How to Extract Stock, ETF, Index, Mutual Fund, and Crypto Data (Step-by-Step… was originally published in Coinmonks on Medium, where people are continuing the conversation by highlighting and responding to this story.