KDP Niche Research

List available KDP niche keywords ordered by demand score. Use this to discover what Kindle publishing niches are available for detailed research. Returns keywords ordered by demand score (highest first). This endpoint is free — no payment required. Args: limit: Number of results to return (1-100, default 20) offset: Pagination offset (default 0)

{'type': 'object', 'title': 'list_nichesArguments', 'properties': {'limit': {'type': 'integer', 'title': 'Limit', 'default': 20}, 'offset': {'type': 'integer', 'title': 'Offset', 'default': 0}}}

{'type': 'object', 'title': 'list_nichesDictOutput', 'additionalProperties': True}

Get detailed KDP niche intelligence for a specific keyword. Returns demand score, competition score, Amazon BSR range, estimated monthly revenue, review threshold, average book pricing, and data freshness for the given Kindle publishing niche. Pricing tiers (x402 USDC on Base network): - $0.03 per query for cached/pre-seeded keywords - $0.10 per query for live on-demand research (new keywords) Use the free `list_niches` tool first to see available keywords. Payment options: 1. Set the KDP_X_PAYMENT environment variable on the server for auto-pay. 2. Pass a valid x402 payment header via the x_payment argument. 3. If neither is set, the tool returns structured 402 payment instructions that an x402-capable agent can use to construct and retry payment. Args: keyword: The KDP niche keyword to research (e.g. "romance novels", "keto cookbook") x_payment: Optional base64-encoded x402 payment header. Takes precedence over the KDP_X_PAYMENT environment variable.

{'type': 'object', 'title': 'research_nicheArguments', 'required': ['keyword'], 'properties': {'keyword': {'type': 'string', 'title': 'Keyword'}, 'x_payment': {'type': 'string', 'title': 'X Payment', 'default': ''}}}

{'type': 'object', 'title': 'research_nicheDictOutput', 'additionalProperties': True}