NFT Floor Price & Rarity API

NFT collection floor price, volume, holders, rarity data. Ethereum and Base via Reservoir. 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 | $0.005 | Get NFT collection floor price, volume, and stats |
| nft_get_token_rarity | GET | /api/rarity | $0.003 | Get NFT token rarity rank, score, and trait floor prices |

nft_get_collection_data

Use this when you need NFT collection floor price, volume, or holder data. Returns comprehensive collection stats from Reservoir 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_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.

Example agent prompts

- "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