Decision desk
Compare without the marketing fog.
Use the matrix for orientation, then open a substantive comparison for tradeoffs and source context.
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Select up to four providers. The first three are shown by default.
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| Fact | Alpaca | Alpha Vantage | BOK ECOS | Claude API | Cloudflare API | CoinGecko API | Currencylayer | DeepSeek Search & Fetch | EODHD | Financial Modeling Prep API | Finnhub API | FRED API | FSC Basic Fund Product Information | FSS DART API | Gemini API | GitHub REST API | KRX API | Mapbox APIs | Massive | Neon API | Notion API | Open-Meteo API | OpenAI API | Oracle Cloud Infrastructure API | Paddle Billing API | Render API | SEC EDGAR APIs | SEIBRO | Slack Web API | Stripe API | Supabase Data APIs | Treasury Fiscal Data API | Twelve Data API | Twilio Messaging API | World Bank Indicators API | yfinance |
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| Category | market-data | market-data | public-data | ai | developer-platform | market-data | currency-data | ai | market-data | market-data | market-data | public-data | public-data | public-data | ai | developer-platform | market-data | mapping-weather | market-data | developer-platform | communications | mapping-weather | ai | developer-platform | payments | developer-platform | public-data | public-data | communications | payments | developer-platform | public-data | market-data | communications | public-data | market-data |
| Authentication | Trading API users: APCA-API-KEY-ID and APCA-API-SECRET-KEY headers | API key in the apikey query parameter | ECOS API key embedded in the request path | Authorization bearer token or x-api-key, plus an anthropic-version header | Scoped API token in Authorization Bearer header; legacy global API key also documented | Plan-specific API key header for Demo or Pro access | Access key supplied with the access_key request parameter | Authorization: Bearer with a DeepSeek API key; JSON content type | API token in the api_token query parameter | API key via apikey request header or query parameter | API key via `token` query param or `X-Finnhub-Token` header | API key query parameter | data.go.kr serviceKey query parameter | API key (crtfc_key) in query parameter | Gemini API key in x-goog-api-key; current documentation distinguishes authorization keys from standard keys | Bearer token recommended; selected public resources allow unauthenticated requests | Issued key in AUTH_KEY request header; service use requires approval | Access token, generally passed as access_token | Bearer API key or apiKey query parameter | API key via Bearer token | Bearer token from an internal, personal, or OAuth connection | No API key for non-commercial public access; commercial customer endpoints differ | Bearer API key in the Authorization header | RSA key pair with API key fingerprint, signed requests | Bearer API key in Authorization header | API key via Bearer token | No API key; declare a responsible User-Agent per SEC policy | Browser access does not establish an unauthenticated server API contract; reusable API authentication is unverified. | OAuth access token in Authorization Bearer header | Secret key with HTTP Basic authentication; publishable keys have limited client uses | Project key plus user JWT or service-role context | No authentication required for public endpoints | API key via `apikey` query param or `Authorization: apikey` header | HTTP Basic authentication using Account SID and Auth Token; API keys recommended for production | No API key or authentication required | No user-managed API key for the normal package interface |
| Base URL | https://data.alpaca.markets/v2 | https://www.alphavantage.co/query | https://ecos.bok.or.kr/api | https://api.anthropic.com | https://api.cloudflare.com/client/v4 | https://api.coingecko.com/api/v3 | https://api.currencylayer.com | https://api.deepseek.com | https://eodhd.com/api | https://financialmodelingprep.com/stable | https://finnhub.io/api/v1 | https://api.stlouisfed.org/fred | https://apis.data.go.kr/1160100/service/GetFundProductInfoService | https://opendart.fss.or.kr/api | https://generativelanguage.googleapis.com/v1beta | https://api.github.com | Service-specific URL in the approved KRX OPEN API specification | https://api.mapbox.com | https://api.massive.com | https://console.neon.tech/api/v2 | https://api.notion.com/v1 | https://api.open-meteo.com/v1 | https://api.openai.com/v1 | Service-specific regional endpoints, e.g. https://iaas.us-ashburn-1.oraclecloud.com | https://api.paddle.com | https://api.render.com/v1 | https://data.sec.gov | Public REST base URL not independently verified; official website: https://seibro.or.kr/ | https://slack.com/api | https://api.stripe.com/v1 | https://PROJECT_REF.supabase.co/rest/v1 | https://api.fiscaldata.treasury.gov/services/api/fiscal_service | https://api.twelvedata.com | https://api.twilio.com/2010-04-01 | https://api.worldbank.org/v2 | Python package (not a contracted hosted API base URL) |
| Pricing shape | Individual Trading API equities: Basic is free; Algo Trader Plus is listed at USD 99/month. Broker pricing and redistribution rights require separate review. | A free standard allowance and paid premium request-rate plans. | Public API access after key registration. | Usage-based pricing varies by model; Message Batches are documented with discounted processing. | API operations manage products whose pricing and entitlements vary | Demo and paid plans; current entitlements are plan-specific | Free non-commercial tier plus paid commercial plans with larger monthly quotas and fresher updates. | Search and Fetch each cost USD 0.75 per 1,000 successful requests; consult the dated billing conditions below. | Free trial tier plus paid personal and commercial plans; entitlements differ by dataset. | Free tier with limited calls; paid plans for full access | Free tier: 60 calls/min; paid tiers raise limits | Free API key access under FRED terms | Free, with an application for use through the Public Data Portal. | Generally free with an approved key; FSS may announce paid services | Free and paid tiers vary by model and feature. | API access follows GitHub product and authentication context | No blanket API price stated in reviewed terms; noncommercial use only | Usage-based by product SKU and monthly volume | Free and paid asset-class plans; business licensing is separate from individual plans. | Free: 100 projects, 100 CU-hours/month and 1 GB storage per project; paid usage-based Launch/Scale plans | API access accompanies Notion connections; workspace plan limits also apply | Free non-commercial access and paid commercial plans | Usage-based pricing varies by model and capability. | Pay-as-you-go plus Always Free tier (Ampere A1, AMD E2 Micro) | Commercial merchant-of-record pricing; verify current terms | Free tier with limitations, paid plans per service type | Public access without usage fees | No public server API pricing schedule was verified in the reviewed pages. | API availability and workspace features depend on Slack plans | Transaction and product-specific pricing varies by country and feature | Free and paid project plans with usage-based allowances | Free public access | Free: 800 credits/day; paid from $79/mo (Grow) | Usage-based by destination, channel, sender and carrier fees | Free public access | Free, open-source software under Apache-2.0; underlying data rights are separate. |
| Rate limits | Individual Trading API historical equities: Basic 200 calls/minute; Algo Trader Plus 10,000 calls/minute, per the plan table checked 2026-10-16. | The standard free usage limit is 25 requests per day; premium plans raise throughput. | Service-policy limits apply to the registered key; confirm the current allowance in ECOS. | Organization-level usage tiers enforce request, token, and spend limits. | Cloudflare documents global and endpoint-specific limits | Plan-specific request limits documented by CoinGecko | Monthly request allowance and data-refresh frequency depend on plan. | Account-level limits: Search 100 requests/second and Fetch 25 requests/second, independently. Fetch also has a per-domain limit whose numeric value was not specified. | Plan-based daily and per-minute limits. | Varies by plan; HTTP 429 when exceeded | 60 calls/min free; 30 req/sec global cap; HTTP 429 when exceeded | Official documentation governs request limits; avoid encoding an unverified fixed number | The listed development allowance is 10,000 requests; production increases may be requested with a use case. | Error 020 generally occurs after 20,000 requests; configured limits may differ | Per-project limits vary by model and usage tier across RPM, TPM, RPD, and specialized dimensions. | Primary and secondary rate limits depend on authentication and operation | Up to 10,000 requests per key per day under current terms | Product-specific limits; inspect each API reference and response headers | The free Stocks Basic plan lists 5 API calls per minute; paid plan behavior depends on product and entitlement. | 700 requests/minute; additional route and operation burst limits apply | Per-connection and per-workspace limits; current plan-specific values are official-doc mutable facts | Usage limits and commercial terms are maintained on the official pricing page | Organization/project and model-specific limits, with usage tiers and response headers. | Many APIs throttle with HTTP 429; use exponential backoff | Rate limits are documented by endpoint and response headers | Endpoint-specific; most GET requests share 400/minute per user | SEC currently asks automated clients to stay within its published fair-access threshold | No server API request allowance or service-level guarantee was verified. | Per-method rate tiers and special limits; honor Retry-After | Global and endpoint-specific limiters; handle 429 responses | Resource and product limits depend on the project plan | No fixed numeric limit recorded; clients should cache and request responsibly | Free: 8 credits/min, 800 credits/day; HTTP 429 when exceeded | Throughput depends on sender, destination, channel and account configuration | No fixed public quota recorded in the reviewed overview | No service-level quota or SLA is published by the project; upstream behavior can change. |
| Protocols | REST, WebSocket | REST | REST | REST, Streaming | REST | REST, WebSocket | REST | REST | REST, WebSocket | REST, WebSocket | REST, WebSocket | REST | REST | REST | REST, Streaming, WebSocket | REST, Webhooks | REST | REST | REST, WebSocket, S3-compatible flat files | REST, PostgreSQL wire protocol | REST, Webhooks | REST | REST, Streaming, WebSocket | REST | REST, Webhooks | REST | REST, Bulk download | HTTPS | REST, Webhooks, Socket Mode | REST, Webhooks | REST, GraphQL, WebSocket | REST | REST, WebSocket | REST, Webhooks | REST | Python library, WebSocket helpers |
| Formats | JSON | JSON, CSV | JSON, XML | JSON, Server-sent events | JSON | JSON | JSON, JSONP | JSON, Markdown page content | JSON, CSV | JSON | JSON | JSON, XML, CSV, XLSX | JSON, XML | XML, JSON | JSON, Server-sent events | JSON | JSON, XML | JSON, GeoJSON, Vector tiles, Raster images | JSON, Flat files | JSON | JSON | JSON | JSON, Server-sent events | JSON | JSON | JSON | JSON, ZIP | HTML portal; integration XML requires separate verification | JSON, Multipart | JSON, Form-encoded requests | JSON | JSON, CSV | JSON, CSV | JSON, Form-encoded requests | XML, JSON, JSON-stat, CSV | Python objects, pandas DataFrame |
Head to head
Substantive comparisons.
Every comparison points back to provider-level official sources.
Verified 2026-09-13
EODHD vs Massive
Choose between global multi-dataset breadth and a market-data stack with strong U.S. REST, WebSocket, and flat-file workflows.
Verified 2026-09-13EODHD vs Alpha Vantage
Compare a broad subscription market-data catalog with a low-friction, function-based API popular for scripts and prototypes.
Verified 2026-09-13OpenAI API vs Anthropic Claude API
Compare two usage-priced model platforms by integration surface, authentication, tool workflows, limits, and evaluation discipline.
Verified 2026-09-13OpenAI API vs Google Gemini API
Compare broad multimodal model platforms across API shape, project controls, streaming, media workflows, and rapidly changing quotas.
Verified 2026-09-13Massive vs Alpha Vantage
Compare a U.S.-market-focused REST, streaming, and flat-file platform with a simple function-oriented API for compact workloads.
Verified 2026-10-15Anthropic Claude API vs Google Gemini API
Compare two usage-priced LLM platforms by authentication, versioning, quota models, streaming, and cloud-adjacent workflows.
Verified 2026-10-15Stripe API vs Paddle Billing API
Compare a mature payments-and-billing platform with a merchant-of-record billing API for SaaS subscriptions.
Verified 2026-10-15FRED API vs World Bank Indicators API
Compare the U.S. macroeconomic time-series API with the cross-country development indicators API.
Verified 2026-10-15EODHD vs yfinance
Compare a contracted subscription market-data API with a free open-source Python library over Yahoo Finance interfaces.
Verified 2026-10-15Treasury Fiscal Data API vs FRED API
Compare the U.S. Treasury's fiscal datasets with the Federal Reserve Bank of St. Louis's economic series by coverage, authentication, discovery, and revision semantics.
Verified 2026-10-15FSC Fund Product API vs BOK ECOS
Compare Korea's two flagship public finance APIs: the FSC fund-product identifier service on data.go.kr and the Bank of Korea's ECOS economic-statistics engine.
Verified 2026-10-15yfinance vs Alpha Vantage
Compare a free open-source Python library over Yahoo Finance interfaces with a hosted, key-based market-data API for prototypes and small projects.
Verified 2026-10-15Massive vs yfinance
Compare a contracted market-data platform with REST, WebSocket, and bulk flat files against a free open-source Python library for market-data work.
Verified 2026-10-15Neon vs Supabase
Compare serverless PostgreSQL with branching against a full backend-as-a-service platform with auto-generated APIs.