How to evaluate an API
A checklist for comparing functionality, docs, auth, pricing and limits before you integrate.
Practical how-to articles published by APISeeker. Providers do not publish marketplace guides.
Step 1
Start from the use case: inputs, outputs and whether coverage matches your markets.
Step 2
Read authentication, error codes and examples. Thin docs are a risk signal.
Step 3
Compare free tier, included quota, rate limits and overage rules — not just list price.
Step 4
Check last verified dates and whether the listing is platform-operated or a verified provider.
Step 5
Test in a playground or sandbox, then measure your own latency and error rates in staging.
Key takeaways
- Start from the use case: inputs, outputs and whether coverage matches your markets.
- Read authentication, error codes and examples. Thin docs are a risk signal.
- Compare free tier, included quota, rate limits and overage rules — not just list price.
- Check last verified dates and whether the listing is platform-operated or a verified provider.
Keep learning
- GuideAPI authentication basicsHow API keys, bearer tokens and OAuth differ — and what to choose for marketplace integrations.
- GuideREST API versioningWhy /v1 paths matter and how to upgrade clients without surprise breakages.
- GuideHow to compare API pricingLook past headline monthly prices to quotas, overage, failed requests and support.
- GuideAPI pagination patternsCursor vs offset pagination — and how to avoid missing or duplicate rows.
Ready to integrate?
Compare plans, open docs, and try endpoints in the playground — then create a key when you are ready for production traffic.