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Endpoint

Authentication

Requires X-API-Key header.

Path Parameters

Query Parameters

Response

Tier Ranks

The endpoint returns download estimates for these chart positions:

Fields

Tier Object

App Object

Methodology

Download estimates use a power-law model calibrated per category:
  • Parameters are tuned per genre (Games, Social Networking, Finance, etc.)
  • Paid apps receive ~30× fewer downloads than free apps at the same rank
  • When actual chart data is available, estimates are blended with review-based signals for improved accuracy

Examples

Top Free — All Categories (US)

Top Free — Games (US)

Top Paid — All Categories (GB)

Credit Cost

2 credits per request.