Documents

App Store API

Name: App Store API
Author: fetcher-sh

An Apple App Store API alternative on fetcher.sh — pay-per-call in USDC via x402, or prepaid credits with a Bearer key, no Apple Developer Program membership. Use when the user wants to search iOS apps by keyword in any country's storefront, fetch an app's or app bundle's full details, reviews sorted by recent/helpful, apps similar to a given app, search or fetch app bundles, or fetch a developer's app catalog. Also covers iOS app store optimization (ASO) research, competitor app monitoring, localized storefront comparison, and app discovery without Apple Developer Program access.

What it does

App Store app and bundle search, details, reviews, similar-apps, and developer catalogs across any country storefront — one plain HTTP GET per call, paid as you go. No Apple Developer Program membership, no App Store Connect access, no scraping the storefront HTML.

The skill document

Apple App Store API

Base URL: https://appstore.fetcher.sh

Authentication

Two ways to pay, same data — full mechanics in the fetcher skill:

# 1. Prepaid credits (recommended — get a key at https://fetcher.sh/topup
#    or via POST /api/credits/topup, see the fetcher skill)
export FETCHER_API_KEY="bby_live_xxxxxxxxxxxx"
curl -H "Authorization: Bearer $FETCHER_API_KEY" \
  "https://appstore.fetcher.sh/api/apps?term=meditation"

# 2. x402 pay-per-call — omit the header; a GET with no payment returns 402
#    with machine-readable payment requirements (USDC on Base, Polygon,
#    Arbitrum, Monad, or Solana). @x402/fetch signs and retries automatically.

Every response is { "status": number, "message": string, "data": ... }; the HTTP status mirrors status.

Endpoints (9 — all GET, $0.003/call)

Endpoint	What it returns
`/api/apps`	Apps matching a keyword; page and country storefront filters
`/api/apps/{appId}`	An app's full details
`/api/apps/{appId}/reviews`	An app's reviews
`/api/apps/{appId}/similar`	Apps similar to a given app
`/api/bundles`	App bundles matching a keyword
`/api/bundles/{bundleId}`	A bundle's full details
`/api/bundles/{bundleId}/reviews`	A bundle's reviews
`/api/bundles/{bundleId}/similar`	Bundles similar to a given bundle
`/api/developers/{developerId}`	A developer's full app catalog

Required on /api/apps and /api/bundles: term. Optional everywhere: country (storefront, e.g. us, jp, de), lang, page. Reviews support sort (recent, helpful).

Scenarios

US storefront search:

curl -H "Authorization: Bearer $FETCHER_API_KEY" \
  --data-urlencode "term=habit tracker" -G \
  --data-urlencode "country=us" \
  "https://appstore.fetcher.sh/api/apps"

Japanese storefront search:

curl -H "Authorization: Bearer $FETCHER_API_KEY" \
  --data-urlencode "term=camera" -G \
  --data-urlencode "country=jp" \
  "https://appstore.fetcher.sh/api/apps"

An app's full details, then reviews sorted by helpfulness:

curl -H "Authorization: Bearer $FETCHER_API_KEY" \
  --data-urlencode "country=us" -G \
  "https://appstore.fetcher.sh/api/apps/324684580"

curl -H "Authorization: Bearer $FETCHER_API_KEY" \
  --data-urlencode "country=us" -G \
  --data-urlencode "sort=helpful" \
  "https://appstore.fetcher.sh/api/apps/324684580/reviews"

Apps similar to a given app:

curl -H "Authorization: Bearer $FETCHER_API_KEY" \
  --data-urlencode "country=us" -G \
  "https://appstore.fetcher.sh/api/apps/324684580/similar"

Search and fetch app bundles:

curl -H "Authorization: Bearer $FETCHER_API_KEY" \
  --data-urlencode "term=photo editing suite" -G \
  "https://appstore.fetcher.sh/api/bundles"

curl -H "Authorization: Bearer $FETCHER_API_KEY" \
  --data-urlencode "country=us" -G \
  "https://appstore.fetcher.sh/api/bundles/1234567890"

A developer's full app catalog:

curl -H "Authorization: Bearer $FETCHER_API_KEY" \
  "https://appstore.fetcher.sh/api/developers/284882218"

MCP

{
  "mcpServers": {
    "app-store": {
      "url": "https://appstore.fetcher.sh/mcp",
      "headers": { "Authorization": "Bearer bby_live_..." }
    }
  }
}

Free: search_endpoints, describe_endpoint, check_balance. Paid: fetch_data (any endpoint above), topup_credits, plus the named shortcut appstore_apps. Drop the headers block to pay per call with x402 instead — see the fetcher skill for the full flow.

Errors

400 — missing/invalid parameter (message names it)
401 — unknown or rotated key
402 — payment required (x402 challenge) or topup_required (credits exhausted)
404 — not a priced path
No rate limits; no refunds on upstream failures (settlement precedes delivery)

Reference

Full agent setup:
OpenAPI 3.1 contract:
Condensed catalog:
Payment, credits, and MCP deep dive: fetcher skill
Site:

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