Books — entry 011 of 22
KDP Intelligence
Pay-per-call niche research for Kindle Direct Publishing authors: free endpoints list keyword demand/competition scores and check what a full pull would cost, while retrieving the actual data for a keyword is billed $0.03 (cached) or $0.10 (fresh) in USDC, settled via an X-Payment header using the x402 protocol on Base rather than a subscription, key, or account. The service has rebranded onto its own nichedata.dev domain, though it's still the same FastAPI/Vercel backend originally deployed at kdp-intelligence-api.vercel.app.
AuthenticationNone requiredCall it straight away — no key, no signup.
HTTPSSupportedTraffic is encrypted in transit.
CORSDisabledBrowser calls need a server-side proxy.
PricingMeteredBilled per request beyond a limited free quota.
FormatsJSONResponses can be requested as JSON.
GreatAPIs Score
Score79
Authentication25/25No authentication required
Pricing11/20Metered / usage-based pricing
Docs14/20Documentation URL provided
Formats9/15Single response format
Freshness20/20Verified within 6 months
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<a href="https://greatapis.com/api/kdp-intelligence/"><img src="https://greatapis.com/badge/kdp-intelligence.svg" alt="Scored 79 on greatapis.com"></a>Auth quickstart
- No key needed — call it now.
Stored keyNo key stored
Your key is stored only in this browser (localStorage) and sent directly to the API — never to greatapis.