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For most developers, Alpha Vantage is a sensible starting point: it covers multiple financial data categories and lists paid access from $41.58, though its free allowance is small. Financial Modeling Prep is a lower-cost option from $19, with plan caps to check. For trading products, Alpaca and Tradier deserve a look; for bank connections, Plaid, Teller and others may fit, but several providers do not publish pricing. We rank all 15 by overall fit, balancing price and clarity against the use cases each API serves.
Quick picksThe shortlist
Alpha VantageAlpha VantageBest overall · $41.58/mo
Financial Modeling PrepFinancial Modeling PrepBest budget pick · $19/mo
AlpacaAlpacaBest for trading apps · $99/mo
TradierTradierBest for options · $10/mo
Polygon.ioPolygon.ioBest market-data toolkit · $23.20/mo
Twelve DataTwelve DataBest for multi-asset data · $79/mo
PlaidPlaidBest for bank data · Free
SnapTradeSnapTradeBest for brokerage links · $100/mo
TellerTellerBest for bank-data evaluation · Free
Salt EdgeSalt EdgeBest for open banking · Free
MXMXBest for institutions · Custom
YodleeYodleeBest for broad use cases · Free
FinnhubFinnhubBest for global data · $3,500/mo
FinicityFinicityBest for lending workflows · Custom
dxFeeddxFeedBest for options data · Custom
01Compared at a glance
| Tool | Score | From | Free plan | Trial |
|---|---|---|---|---|
| Alpha VantageAlpha Vantage | 6.8 | $41.58/mo | Yes | — |
| Financial Modeling PrepFinancial Modeling Prep | 6.6 | $19/mo | Yes | — |
| AlpacaAlpaca | 7.0 | $99/mo | Yes | — |
| TradierTradier | 7.0 | $10/mo | Yes | 2 months |
| Polygon.ioPolygon.io | 6.0 | $23.20/mo | No | — |
| Twelve DataTwelve Data | 6.8 | $79/mo | Yes | — |
| PlaidPlaid | 6.8 | Free | Yes | — |
| SnapTradeSnapTrade | 6.8 | $100/mo | Yes | — |
| TellerTeller | 6.8 | Free | Yes | — |
| Salt EdgeSalt Edge | 6.7 | Free | Yes | — |
| MXMX | 5.8 | Custom | No | — |
| YodleeYodlee | 5.5 | Free | Yes | — |
| FinnhubFinnhub | 6.2 | $3,500/mo | Yes | — |
| FinicityFinicity | 6.0 | Custom | No | — |
| dxFeeddxFeed | 6.2 | Custom | No | — |
02The picks, in detail
- Best overallAlpha VantageAlpha Vantage
Alpha Vantage earns the top spot for its range of financial data categories and a listed starting price of $41.58. Its free plan can help with light testing, but the free allowance is small and paid use adds up. Check the current plan caps against your expected requests before building around it; this is a broad-data pick, not a bank-connection or brokerage API.
What works
- Covers stocks, ETFs, mutual funds, and market indices
- Includes forex, commodities, and economic indicators
- Offers fundamentals and technical indicators
What doesn't
- Free plan is limited to 25 requests per day
- Paid plans start at $49.99 monthly
- Annual pricing is billed yearly
- Best budget pickFinancial Modeling PrepFinancial Modeling Prep
Financial Modeling Prep starts at $19 and offers a broad financial-data API, which makes it one of the more approachable paid options here. Its free API tier can support prototyping, but the plans have meaningful caps, and users report reliability concerns. We would compare the specific endpoints and limits you need with the listed plan before treating the low entry price as the whole cost.
What works
- Free Basic plan allows 250 calls per day.
- More than 100 endpoints cover varied financial data.
- API, WebSocket and bulk download delivery options.
What doesn't
- Basic limits users to end-of-day data and 250 daily calls.
- Starter is US-only and capped at five years of history.
- Global coverage requires Ultimate, listed at $99 monthly billed annually.
- Best for trading appsAlpacaAlpaca
Alpaca fits developers building trading applications or adding brokerage capabilities, and it offers free API tiers. Its listed starting price is $99, but that alone does not establish what a production setup will cost: the published details flag data-feed limits and Broker API costs as things to check. A good fit to evaluate for trading workflows, less compelling if you only need general financial data.
What works
- Free Trading API and Broker API tiers
- Trading APIs cover stocks, options and crypto
- SDKs listed for Python, .NET/C#, Go and Node
What doesn't
- Free Trading API Basic is capped at 200 calls per minute
- Basic equities data is IEX, not full-market SIP
- Algo Trader Plus costs $99 per month
- Best for optionsTradierTradier
Tradier starts at $10 and is specifically suited to active options traders, automated strategies and developers building trading platforms. That focus makes it a better match than a general data API when options pricing and trading are central. It is not an obvious choice for casual manual trading, so compare the API’s fit with your actual workflow rather than choosing on the low starting price alone.
What works
- Free Lite plan with web, mobile and API access
- Pro includes $0 stock and equity-option trades
- APIs support development from prototype to production
What doesn't
- Lite charges $0.35 per stock trade and options contract
- Pro costs $10 monthly; Pro Plus costs $35
- Futures add a $0.35 per-contract fee
- Best market-data toolkitPolygon.ioPolygon.io
Polygon.io starts at $23.20 and offers a flexible market-data toolkit, with API and flat-file access among the use cases identified. It can suit developers building market-data applications and individuals looking for company financials. The caveat is plan scope and data quality: check that the specific data you need is covered before committing. The published details do not spell out the plan limits.
What works
- REST and WebSocket access for real-time and historical data
- Flat files available through an S3 interface
- SQL queries are supported
What doesn't
- No free plan is listed
- Listed plans are marked individual use only
- Annual pricing is needed for the $23.20 starting price
- Best for multi-asset dataTwelve DataTwelve Data
Twelve Data is a capable option for multi-asset products, with API, WebSocket and spreadsheet add-in use cases. Its listed starting price is $79. The free tier and paid-plan credits need scrutiny, so estimate your usage against the credit allowance before settling on it. It offers more than a narrow market-data feed, but the published details do not give the exact plan caps.
What works
- Covers stocks, forex, crypto, ETFs, commodities, and mutual funds
- Offers APIs and real-time WebSocket feeds
- SDKs and spreadsheet add-ins support developer workflows
What doesn't
- First paid tier costs $79/month
- Grow includes 377 API credits and 8 trial WS credits
- Annual prices are not published
- Best for bank dataPlaidPlaid
Plaid is a strong fit for teams building financial products that need bank data APIs, and the published details also point to volume discounts. Its usage rates are unpublished, however, and Reddit reports raise trust and connectivity concerns. That leaves total cost and connection performance less clear than the listed prices of some alternatives. Get pricing and test the connections relevant to your customers before choosing it.
What works
- APIs cover several financial product use cases
- Pay as You Go has no upfront commitment
- Unlimited live API calls on Pay as You Go
What doesn't
- Starting price is not published
- Growth requires a 12-month commitment
- Some products require contacting Plaid for pricing
- Best for brokerage linksSnapTradeSnapTrade
SnapTrade is aimed at apps connecting multiple brokerages, prototyping brokerage integrations and products adding supported trading. Its listed starting point is $100, described in the published details as a Launch fee. Good API coverage on paper is not enough to confirm that your required brokers are available, and costs beyond that fee need checking. Verify broker access and ask for the full price before committing.
What works
- Free Build plan includes up to five brokerage connections
- Build includes real-time data and trading
- One API covers balances, holdings, orders and transactions
What doesn't
- Launch adds per-user fees to its $100 platform fee
- Custom plan pricing is not published
- Trading depends on brokerage support and agreement
- Best for bank-data evaluationTellerTeller
Teller offers a free sandbox for developers evaluating bank-data APIs, and the published details call out apps planning a Plaid migration. That makes it worth considering early in a shortlist. Production pricing and limits are unclear, though, so the free evaluation does not answer whether it will fit your live workload or budget. Ask for both before treating it as a migration target.
What works
- Free Development tier includes up to 100 live connections
- Unrestricted sandbox access is included
- Supports balance and transaction data
What doesn't
- Production pricing is not published
- Production usage limits are not published
- Annual pricing is not published
- Best for open bankingSalt EdgeSalt Edge
Salt Edge covers open-banking products and payment-initiation APIs, and developers can test simulated bank connections. That breadth may suit businesses building beyond basic account aggregation. Production pricing is custom, and reports describe uneven bank connections, so the cost and coverage still need validation for your markets. We would evaluate the specific institutions and payment workflows you need before comparing it with a bank-data API.
What works
- Free sandbox for testing simulated bank connections
- APIs cover account data and payment initiation
- Includes compliance and AML monitoring tools
What doesn't
- Production pricing is custom and unpublished
- Sandbox uses simulated rather than live connections
- Sandbox fetch rate is capped at 2 per second
- Best for institutionsMXMX
MX is positioned for financial institutions consolidating account data, fintechs personalizing financial experiences and teams needing investment-data aggregation. That breadth may suit institutional use, but pricing is custom and unpublished, leaving value difficult to assess from the available details. It is not an easy pick for buyers who need a clear public price. Request a quote and confirm the investment-data scope before shortlisting it.
What works
- Aggregates external account and transaction history
- Cleans, categorizes and standardizes transaction data
- Supports customer analytics and personalized offers
What doesn't
- No published starting price
- Custom pricing requires contacting sales
- Billing terms are not published
- Best for broad use casesYodleeYodlee
Yodlee targets fintechs with broad financial-data needs, institutions seeking custom API arrangements and teams building permissioned-data products. It also has a free plan, according to the published details, but paid pricing is unpublished. Mixed connection reports add another reason to validate coverage before migrating or building around it. Treat it as a candidate for custom arrangements, not a clearly priced default.
What works
- Covers personal finance, credit, wealth, and business finance
- Supports payment account verification
- Offers permissioned financial data through APIs
What doesn't
- API starting price and plan limits are not published
- Pricing is sales-led and custom-quoted
- Reddit users report some bank connections fail or act inconsistently
- Best for global dataFinnhubFinnhub
Finnhub offers a wide financial-data catalog, with a free plan for developers starting with basic US data and use cases involving long financial histories. The listed starting price is $3,500 for the global plan, a serious cost hurdle. That makes it a better fit when global coverage is essential than for a general-purpose project. Confirm that the expensive plan’s scope matches your required markets and history.
What works
- Free plan includes 60 API calls per minute
- Free plan includes US coverage and 50 WebSocket symbols
- All-In-One includes global market and fundamental data
What doesn't
- All-In-One costs $3,500 per month, billed annually
- No monthly billing option is listed
- Earnings transcripts cost extra; add-on price is not published
- Best for lending workflowsFinicityFinicity
Finicity is aimed at businesses building financial-data integrations, lenders verifying account details and teams needing enriched financial data. That focus can make it relevant when verification is central to the product. Pricing is custom, and users report connection headaches, so the available details do not make cost or reliability easy to judge. Ask for a quote and validate connections for your target institutions before selecting it.
What works
- Supports payments, account opening, lending and financial management
- Offers permissioned financial-data sharing
- Includes account verification for onboarding
What doesn't
- No published starting price or billing terms
- Contracts are sales-negotiated
- Usage may be metered by request, report or connected account
- Best for options datadxFeeddxFeed
dxFeed offers breadth across varied market data, with options, index-data workflows and historical tick-data research among its stated fits. The downside is that pricing is unclear and users report feed issues, leaving both cost and delivery quality uncertain. That makes it a candidate for specialized data needs rather than an easy default. Confirm the exact feed coverage, history and price you would receive before signing.
What works
- Historical tick data is available
- Offers real-time, delayed and historical feeds
- Calculated options records include Greeks and TheoPrice
What doesn't
- Starting price and plan details are not published
- Annual billing is not listed
- Reddit users report DOM/MBO differences versus Rithmic
03How we chose
We weigh published pricing and plan limits, documentation, and user sentiment on Reddit, with the buyer’s intended data use in mind. We distinguish banking data needs from investment and market data needs rather than treating every API as interchangeable. Where a provider does not publish a price, cap, or technical detail, we mark it as not published instead of estimating. We do not claim hands-on testing or performance benchmarks; our comparisons rely on available published material and should be checked against current provider terms before you switch.
04Choose by the data you need
Start with the job the API must do. Banking data, investment account data, and market data are different requirements; an API that fits one workflow may not fit another. Before comparing providers, list the institutions, asset types, regions, and workflows your software needs to support. Then check each provider’s documentation for coverage, available data fields, update frequency, and integration requirements. Treat anything the docs do not specify as an open question, not an included feature.
The names on this page are not a substitute for a coverage check. Ask vendors to confirm that they support your required institutions and use cases, and get the answer in writing if a gap would block launch. If you need more than one kind of financial data, compare the cost and maintenance burden of using separate APIs with the cost of finding a provider that covers the full requirement.
05Compare the real cost before switching
Do not compare APIs on a headline price alone. Check the pricing page for billing units, plan limits, overage terms, and whether the features you need are included in the plan you can buy. If a price or cap is not published, ask the provider for a written quote rather than assuming it is free or unlimited.
Before migrating, inventory your existing integrations: data fields in use, refresh needs, error handling, and downstream reports or products. Compare those requirements with the new provider’s docs and identify gaps before you commit. Ask about test access, support, service commitments, and the process for handling a data outage; do not assume these are included unless the terms say so. A small proof of concept can expose integration work, but it does not replace checking coverage, contract terms, or production limits. Keep the old connection available until the replacement meets your documented requirements.
Questions people ask
What is a financial data API?
A financial data API lets software request financial information from a provider. Depending on the product and its coverage, that may involve banking, investment, or market data. Check the API’s documentation to confirm which data types, institutions, and use cases it actually supports.
How do I choose a financial data API?
Begin with the data and coverage your product requires, then compare documentation, published pricing, plan limits, and integration requirements. Confirm missing details with the provider. The right choice depends on your use case; a general category label alone does not establish that an API supports your institutions or workflows.
How much do financial data APIs cost?
Costs depend on provider terms and the plan or usage model. Check current pricing pages for billing units, caps, and overage terms. If pricing is not published, request a quote. Do not assume an API is free, unlimited, or within budget based only on a starting price.
What should I check before switching APIs?
Map your current data fields, coverage needs, refresh requirements, and dependent workflows. Compare them with the new provider’s docs and confirm any unclear limits, support terms, or service commitments in writing. Plan for integration work and keep a fallback until the replacement meets your requirements.