NFT Floor Price & Rarity API

NFT collection floor price, volume, holders, rarity data. Ethereum and Base via Alchemy. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.

Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.

Quickstart -- MCP

Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):

{
  "mcpServers": {
    "nft-floor": {
      "url": "https://nft-floor.api.klymax402.com/mcp"
    }
  }
}

Quickstart -- HTTP (x402)

curl "https://nft-floor.api.klymax402.com/api/collection?address=0x0000000000000000000000000000000000dEaD"
# -> 402 Payment Required, with an x402 payment challenge in the response body

Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.

Tools

Tool	Method	Path	Price	Description
nft_get_collection_data	GET	/api/collection	$0.012	Get NFT collection floor price, volume, and stats
nft_get_collection_data	POST	/api/collection	$0.012	Get NFT collection floor price, volume, and stats (POST variant)
nft_get_token_rarity	GET	/api/rarity	$0.008	Get NFT token rarity rank, score, and trait floor prices
nft_get_token_rarity	POST	/api/rarity	$0.008	Get NFT token rarity rank, score, and trait floor prices (POST variant)

nft_get_collection_data

Use this when you need NFT collection floor price, volume, or holder data. Returns comprehensive collection stats from Alchemy for Ethereum and Base NFTs.

Parameters

Name	Type	Required	Description
address	string	yes	NFT collection contract address. e.g. 0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D (BAYC)
chain	string	no	Blockchain: ethereum or base. Default: ethereum

Returns

• floorPrice -- current floor price in ETH and USD
• volume24h -- 24-hour trading volume in ETH and USD
• totalSupply -- total number of NFTs in the collection
• holderCount -- number of unique holders
• listedCount -- number of NFTs currently listed for sale
• listedPercent -- percentage of supply listed
• topTraitFloors -- floor prices broken down by top traits

Example response:

{"floorPrice":{"eth":12.5,"usd":44000},"volume24h":{"eth":89.3,"usd":314000},"totalSupply":10000,"holderCount":5421,"listedCount":312,"listedPercent":3.12,"topTraitFloors":[{"trait":"Gold Fur","floor":45.2}]}

When to use: tracking NFT collection values, comparing collections, or monitoring floor price movements. Essential for NFT portfolio valuation and market analysis.

nft_get_collection_data

Use this when you need NFT collection floor price, volume, or holder data. Returns comprehensive collection stats from Alchemy for Ethereum and Base NFTs. POST variant of nft_get_collection_data -- same params passed as JSON body instead of query string.

Parameters

Name	Type	Required	Description
address	string	yes	NFT collection contract address. e.g. 0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D (BAYC)
chain	string	no	Blockchain: ethereum or base. Default: ethereum

Returns

• floorPrice -- current floor price in ETH and USD
• volume24h -- 24-hour trading volume in ETH and USD
• totalSupply -- total number of NFTs in the collection
• holderCount -- number of unique holders
• listedCount -- number of NFTs currently listed for sale
• listedPercent -- percentage of supply listed
• topTraitFloors -- floor prices broken down by top traits

Example response:

{"floorPrice":{"eth":12.5,"usd":44000},"volume24h":{"eth":89.3,"usd":314000},"totalSupply":10000,"holderCount":5421,"listedCount":312,"listedPercent":3.12,"topTraitFloors":[{"trait":"Gold Fur","floor":45.2}]}

When to use: tracking NFT collection values, comparing collections, or monitoring floor price movements. Essential for NFT portfolio valuation and market analysis.

nft_get_token_rarity

Use this when you need rarity data for a specific NFT token. Returns rarity rank, score, attributes, and trait-level floor prices for valuation.

Parameters

Name	Type	Required	Description
address	string	yes	NFT collection contract address
tokenId	string	yes	Token ID within the collection. e.g. 1234
chain	string	no	Blockchain: ethereum or base. Default: ethereum

Returns

• rarityRank -- token's rarity rank within the collection (e.g. 142 out of 10000)
• rarityScore -- computed rarity score
• totalSupply -- total tokens in the collection
• attributes -- array of token traits with name, value, frequency, and trait floor price
• estimatedValue -- estimated value based on rarity and trait floors

Example response:

{"rarityRank":142,"rarityScore":285.4,"totalSupply":10000,"attributes":[{"trait":"Background","value":"Gold","frequency":0.02,"traitFloor":18.5},{"trait":"Eyes","value":"Laser","frequency":0.04,"traitFloor":15.2}],"estimatedValue":{"eth":22.3,"usd":78500}}

When to use: valuing individual NFTs, finding underpriced tokens, or building rarity-based trading strategies.

nft_get_token_rarity

Use this when you need rarity data for a specific NFT token. Returns rarity rank, score, attributes, and trait-level floor prices for valuation. POST variant of nft_get_token_rarity -- same params passed as JSON body instead of query string.

Parameters

Name	Type	Required	Description
address	string	yes	NFT collection contract address
tokenId	string	yes	Token ID within the collection. e.g. 1234
chain	string	no	Blockchain: ethereum or base. Default: ethereum

Returns

• rarityRank -- token's rarity rank within the collection (e.g. 142 out of 10000)
• rarityScore -- computed rarity score
• totalSupply -- total tokens in the collection
• attributes -- array of token traits with name, value, frequency, and trait floor price
• estimatedValue -- estimated value based on rarity and trait floors

Example response:

{"rarityRank":142,"rarityScore":285.4,"totalSupply":10000,"attributes":[{"trait":"Background","value":"Gold","frequency":0.02,"traitFloor":18.5},{"trait":"Eyes","value":"Laser","frequency":0.04,"traitFloor":15.2}],"estimatedValue":{"eth":22.3,"usd":78500}}

When to use: valuing individual NFTs, finding underpriced tokens, or building rarity-based trading strategies.

Example agent prompts

• "NFT collection floor price, volume, or holder data"
• "NFT collection floor price, volume, or holder data"
• "Rarity data for a specific NFT token"

Payment

• Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
• Network: Base L2 (eip155:8453)
• Asset: USDC
• Facilitator: Coinbase CDP (primary), PayAI (fallback)
• Also reachable via ATXP (OAuth-wrapped x402, RFC 9728 protected-resource metadata)

Part of klymax402

100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.

• Catalog: https://klymax402.com/llms.txt
• Full API reference: https://klymax402.com/llms-full.txt
• Live stats: https://klymax402.com/stats

License

MIT