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ARC API vs Marketplace Fee Data API

Two free Shopping APIs compared on access, reliability and developer ratings, using data from our daily health checks.

The verdict

  • Choose ARC API if its data fits your use case better; on access and reliability it's level with Marketplace Fee Data API.
  • Choose Marketplace Fee Data API if its data fits your use case better; on access and reliability it's level with ARC API.

Side by side

ARC APIMarketplace Fee Data API
What it doesOpen data on whether AI shopping agents can reach checkout at specific online stores.Seller fee schedules for 21 e-commerce marketplaces and payment processors as JSON.
ProviderARCSellersCalc — E-commerce Calculators
API keyNot neededNot needed
HTTPSYesYes
CORS (browser calls)YesYes
Status todayOnline · 661 msOnline · 806 ms
Uptime (30 days)UpUp
Developer ratingNot rated yetNot rated yet
PriceFree / free tierFree / free tier
ARC docs ↗Marketplace Fee Data docs ↗

About each API

ARC logoARC API

Open data on whether AI shopping agents can reach checkout at specific online stores.

Free developer tools for agentic commerce: a UCP profile validator, the arc-check CLI and CI step for UCP and WebMCP, a no-key REST API with OpenAPI, and an MCP server for Claude, Cursor and ChatGPT.

Strengths

  • No API key needed
  • Callable from the browser (CORS)
  • HTTPS

Ratings, reviews and FAQ →

Marketplace Fee Data logoMarketplace Fee Data API

Seller fee schedules for 21 e-commerce marketplaces and payment processors as JSON.

Free JSON API of marketplace and payment fee schedules — Amazon, eBay, Etsy, PayPal, Stripe and 16 more platforms. CC BY 4.0, no key, CORS enabled.

Strengths

  • No API key needed
  • Callable from the browser (CORS)
  • HTTPS

Ratings, reviews and FAQ →

How to choose between them

  • Prototyping or a tutorial? Pick the one that needs no API key (both qualify).
  • Calling from a web page? You need CORS. Otherwise route requests through your own server or a serverless function.
  • Going to production? Favour HTTPS, a strong uptime record and a provider with clear rate limits and terms. Check each API's docs before you commit.
  • Still unsure? Both are free to try: send one request to each and compare the data you get back.

ARC vs Marketplace Fee Data FAQ

Do ARC API and Marketplace Fee Data API need an API key?

Neither needs an API key; you can call both straight away.

More comparisons

ARC API alternatives · Marketplace Fee Data API alternatives · best Shopping APIs