{"id":"f48a70f5-4cb1-46f4-b071-44efcf335d99","shortId":"FQCsMW","kind":"x402","title":"NFT collection floor-price data via x402 micropayment on Base, $0.02 per request.","tagline":"NFT collection floor-price data via x402 micropayment on Base, $0.02 per request.","description":"This endpoint returns floor-price data for NFT collection #28 hosted on lowpaymentfee.com. It is part of a broader suite of pay-per-call APIs offered by the same provider, spanning data analytics, AI/ML inference, finance/Web3 market data, and utility services. All endpoints on the platform use the x402 payment protocol, settling in USDC on the Base network at $0.02 per request.\n\nThe specific endpoint `/api/v1/collections/28/floor` accepts POST requests and returns JSON. Based on the URL structure, it likely provides the current floor price for a particular NFT collection identified by ID 28. However, no detailed documentation, request schema, or response schema is available — the docs, pricing, and README pages all resolve to a minimal \"Connect wallet\" prompt with no further content.\n\nThe platform advertises no API keys, no rate limits, and instant access. Payment is handled entirely through the x402 challenge-response flow: callers receive a 402 with payment instructions, settle via USDC on Base, and then receive the API response. The x402 challenge confirms the endpoint is live, with a max amount of 20,000 base units of USDC (6 decimals), equaling $0.02 per call.","tags":[],"capabilities":["nft-floor-price","x402-payment","usdc-settlement","base-network","pay-per-request","json-api"],"categories":["finance","nft","web3"],"synonyms":["NFT floor price","collection floor price","NFT market data","NFT pricing API","crypto collectibles floor","x402 NFT API"],"warnings":["No request or response schema available — the actual data returned is unknown.","Collection ID 28 is not identified; unclear what NFT collection this refers to.","All documentation pages (docs, pricing, README) return only a 'Connect wallet' prompt with no usable content.","This endpoint is not listed on the provider's own homepage catalog, raising questions about its status."],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/28/floor","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/collections/28/floor","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 x402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no request/response schema, no examples, and the specific collection (ID 28) is unidentified. The docs/pricing/README pages are all empty beyond a wallet-connect 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'0.02':12,26,90,216 '000':208 '20':207 '28':39,123 '402':179 '6':213 'NFT floor price' 'NFT market data' 'NFT pricing API' 'accept':97 'access':164 'advertis':155 'ai/ml':64 'amount':205 'analyt':63 'api':55,157,192 'avail':134 'base':11,25,87,103,187,209 'base-network' 'broader':48 'call':54,218 'caller':176 'challeng':173,196 'challenge-respons':172 'collect':2,16,38,119 'collection floor price' 'confirm':197 'connect':146 'content':152 'crypto collectibles floor' 'current':112 'data':6,20,35,62,68 'decim':214 'detail':126 'doc':136 'document':127 'endpoint':30,73,95,199 'entir':168 'equal':215 'finance/web3':66 'floor':4,18,33,113 'floor-pric':3,17,32 'flow':175 'handl':167 'host':40 'howev':124 'id':122 'identifi':120 'infer':65 'instant':163 'instruct':182 'json':102 'json-api' 'key':158 'like':109 'limit':161 'live':201 'lowpaymentfee.com':42 'market':67 'max':204 'micropay':9,23 'minim':145 'network':88 'nft':1,15,37,118 'nft-floor-price' 'offer':56 'page':140 'part':45 'particular':117 'pay':52 'pay-per-cal':51 'pay-per-request' 'payment':80,165,181 'per':13,27,53,91,217 'platform':76,154 'post':98 'price':5,19,34,114,137 'prompt':148 'protocol':81 'provid':60,110 'rate':160 'readm':139 'receiv':177,190 'request':14,28,92,99,128 'resolv':142 'respons':131,174,193 'return':31,101 'schema':129,132 'servic':71 'settl':82,183 'span':61 'specif':94 'structur':107 'suit':49 'unit':210 'url':106 'usdc':84,185,212 'usdc-settlement' 'use':77 'util':70 'via':7,21,184 'wallet':147 'x402':8,22,79,171,195 'x402 NFT API' 'x402-payment'","prices":[{"id":"d4d83cce-14ca-4251-be4c-f8527e9abc92","listingId":"f48a70f5-4cb1-46f4-b071-44efcf335d99","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/collections/28/floor","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T22:29:45.871Z"}],"sources":[{"listingId":"f48a70f5-4cb1-46f4-b071-44efcf335d99","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/28/floor","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T22:29:45.871Z","lastSeenAt":"2026-04-23T00:32:38.574Z"}],"details":{"listingId":"f48a70f5-4cb1-46f4-b071-44efcf335d99","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/28/floor\n# Returns 402 with x402 challenge. Include X-PAYMENT header with USDC payment proof on Base to receive floor-price data.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/collections/28/floor"},{"claim":"All APIs on the platform cost $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Base","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying the current floor price of a specific NFT collection for trading decisions","Integrating real-time NFT floor data into a portfolio tracker or dashboard","Automated agents monitoring NFT market conditions without API key management"],"bestFor":["Agents or bots that need on-demand NFT floor prices without subscription commitments","Developers prototyping NFT analytics with minimal setup","x402-native workflows that settle micropayments in USDC on Base"],"notFor":["Bulk historical NFT data retrieval (no evidence of batch or historical endpoints)","Users who need detailed collection metadata beyond floor price"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:25.362Z"},"updatedAt":"2026-04-23T00:32:38.574Z"}}