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If Polygon.io’s reference data is the reason you’re leaving, start with Finnhub, Financial Modeling Prep or Alpha Vantage for financial-data APIs. Alpaca and Tradier are better fits when trading is part of the product; SnapTrade focuses on brokerage connections, so it is not a like-for-like market-data replacement. The listed starting prices range from $10 to $3,500, but plan scope matters: compare caps and data coverage before moving production workloads.
01Why people leave Polygon.io
Reference data errors and gaps
A Reddit thread reports incorrect company details, missing tickers and outdated data. The original poster said the complaints mainly involved Polygon’s Reference API, not a test of WebSockets.
Unresolved support reports
Some commenters say support acknowledged issues but follow-up brought no resolution or response. Those are individual Reddit reports, not evidence about every support case.
Confusing API behavior
A commenter describes confusion around adjusted versus unadjusted data and historical queries tied to listing dates. Check whether an alternative fits your data workflow before switching.
02The alternatives, ranked by fit
- Global financial data
FinnhubFinnhubFinnhub is a candidate if Polygon’s data coverage is your concern and you need a broad financial-data catalog or long financial histories. The published summary says it also offers basic US data. Its listed starting price is $3,500, with a free plan noted, so confirm which plan covers your required markets before budgeting for a migration.
Trade-off: The global plan’s listed $3,500 monthly price is a serious hurdle.
6.2/10from
$3,500/mofree plan - Structured market data
Financial Modeling PrepFinancial Modeling PrepFinancial Modeling Prep is a closer fit if you want structured market data and US-focused research without starting at Finnhub’s listed global price. The published summary lists a $19 starting price and a free API tier. It also flags meaningful plan caps and user-reported reliability concerns, so check limits and validate the data you depend on.
Trade-off: Plan caps and reported reliability concerns still need checking.
6.6/10from
$19/mofree plan - Multiple data categories
Alpha VantageAlpha VantageAlpha Vantage suits developers who need multiple financial-data categories or want to test an integration within a free allowance. The published summary lists a $41.58 starting price and says the free allowance is small. If Polygon’s data quality is the issue, compare the specific fields you need rather than assuming a broad catalog guarantees cleaner records.
Trade-off: The free allowance is small; paid use adds up.
6.8/10from
$41.58/mofree plan - Trading app developers
AlpacaAlpacaAlpaca makes more sense if the replacement needs to support a trading application, not just deliver market data. The published summary lists free API tiers and a $99 starting price, while warning that data-feed limits and Broker API costs need checking. Confirm those limits against your use case before treating its free tier as a production substitute.
Trade-off: Check data-feed limits and Broker API costs before committing.
7.0/10from
$99/mofree plan - Options trading APIs
TradierTradierTradier is worth comparing if your Polygon integration supports automated trading or an options-focused product. The published summary calls it an API-first broker, lists a $10 starting price and notes a free plan. That makes it an adjacent replacement for trading workflows, not a direct answer if your only requirement is broad market-data access.
Trade-off: It is not an obvious fit for casual manual trading.
7.0/10from
$10/mofree plan - Brokerage connections
SnapTradeSnapTradeSnapTrade fits products that connect users to multiple brokerages or add supported trading. The published summary lists a free plan and a $100 Launch fee. It may replace a brokerage-connection component in your stack, but it is not a like-for-like alternative for Polygon’s market-data APIs; check supported broker access first.
Trade-off: Broker access varies; it is not a market-data replacement.
6.8/10from
$100/mofree plan
03Side by side
| Tool | Score | From | Free plan | Best for |
|---|---|---|---|---|
 Polygon.io Polygon.io (current) | 6.0 | $23.20/mo | No | Developers building market-data applications |
| Finnhub Finnhub | 6.2 | $3,500/mo | Yes | Teams needing broad global financial data |
| Financial Modeling Prep Financial Modeling Prep | 6.6 | $19/mo | Yes | Developers needing structured market data |
| Alpha Vantage Alpha Vantage | 6.8 | $41.58/mo | Yes | Developers building financial data integrations |
| Alpaca Alpaca | 7.0 | $99/mo | Yes | Developers building trading applications |
| Tradier Tradier | 7.0 | $10/mo | Yes | Active options traders |
| SnapTrade SnapTrade | 6.8 | $100/mo | Yes | Apps connecting multiple brokerages |
Questions people ask
Which Polygon.io alternative is closest for market data?
Among these options, Finnhub, Financial Modeling Prep and Alpha Vantage are the clearest financial-data API candidates in the published summaries. Their listed strengths differ: global data and long histories, structured US-focused data, or multiple data categories. Compare required fields and plan caps before migrating.
What is the cheapest listed Polygon.io alternative here?
Tradier has the lowest listed starting price in this selection at $10, with a free plan noted. But it is described as an API-first broker with an options focus, not a direct market-data replacement. Financial Modeling Prep starts at $19 and is described as a structured market-data API.
Can I avoid Polygon’s reported data-quality issues by switching?
The published material does not establish that any alternative has cleaner data. Reddit reports about Polygon focus mainly on its Reference API, and the original poster said they did not test WebSockets. Check the exact symbols and fields you rely on against each candidate before moving production use.