{"id":"307271d4-df0a-4bf1-bc8a-5de5654edad5","shortId":"LUBsZ2","kind":"x402","title":"NFT collection floor price data via x402 micropayment on Base network, $0.02/request.","tagline":"NFT collection floor price data via x402 micropayment on Base network, $0.02/request.","description":"This endpoint provides NFT collection floor price data at the path `/api/v1/collections/16/floor`. It is part of a broader suite of pay-per-request APIs hosted on lowpaymentfee.com, all settled via the x402 protocol on the Base network using USDC. Each request costs $0.02 (20,000 base units of USDC with 6 decimals).\n\nThe provider offers a range of endpoints spanning data analytics, AI/ML inference, finance/Web3 market data, and utility services — all at the same $0.02 per-call price point. This specific endpoint appears to serve floor price information for a particular NFT collection (collection ID 16). No API keys or rate limits are advertised; access is gated solely by the x402 payment header.\n\nDocumentation is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no example request/response payloads, and no description of what fields are returned. The endpoint is confirmed live (returns a proper 402 challenge), but the actual response format must be discovered empirically.","tags":[],"capabilities":["nft-floor-price","x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["web3","nft","finance"],"synonyms":["NFT floor price API","collection floor price","NFT market data","x402 NFT endpoint","micropayment API","Base USDC API"],"warnings":["No API documentation available — docs page renders only 'Connect wallet'","No response schema or example payloads documented","Collection ID 16 is opaque — no indication of which NFT collection it refers to","Provider site offers many endpoints but none have public technical documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/16/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/16/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 with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documented request/response format, no examples, and the docs pages are empty. The listing is effectively a stub with only the payment challenge and landing page to go 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'/request':13,26 '0.02':12,25,70,102 '000':72 '16':124 '20':71 '402':189 '6':78 'Base USDC API' 'NFT floor price API' 'NFT market data' 'access':133 'actual':193 'advertis':132 'ai/ml':90 'analyt':89 'api':51,126,150 'appear':111 'base':10,23,63,73 'base-network' 'broader':44 'call':105 'challeng':190 'collect':2,15,31,121,122 'collection floor price' 'confirm':184 'connect':156 'cost':69 'data':5,18,34,88,94 'decim':79 'descript':175 'detail':163 'discov':198 'doc':147 'document':142 'empir':199 'endpoint':28,86,110,182 'exampl':170 'extrem':144 'field':178 'finance/web3':92 'floor':3,16,32,114 'format':195 'gate':135 'header':141 'host':52 'id':123 'infer':91 'inform':116 'key':127 'limit':130 'live':185 'lowpaymentfee.com':54 'market':93 'micropay':8,21 'micropayment API' 'must':196 'network':11,24,64 'nft':1,14,30,120 'nft-floor-price' 'no-api-key' 'offer':82 'openapi':167 'page':151 'part':41 'particular':119 'path':37 'pay':48 'pay-per-request':47 'payload':172 'payment':140 'per':49,104 'per-cal':103 'point':107 'price':4,17,33,106,115,148 'prompt':158 'proper':188 'protocol':60 'provid':29,81 'rang':84 'rate':129 'render':153 'request':50,68 'request/response':171 'respons':194 'return':180,186 'schema':168 'serv':113 'servic':97 'settl':56 'sole':136 'span':87 'spars':145 'specif':109 'suit':45 'technic':162 'unit':74 'usdc':66,76 'usdc-settlement' 'use':65 'util':96 'via':6,19,57 'wallet':157 'x402':7,20,59,139 'x402 NFT endpoint' 'x402-payment'","prices":[{"id":"7366a0f3-c2bb-413a-9ca1-a8724a1d45e2","listingId":"307271d4-df0a-4bf1-bc8a-5de5654edad5","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/16/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":"2026-04-18T22:29:48.275Z"}],"sources":[{"listingId":"307271d4-df0a-4bf1-bc8a-5de5654edad5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/16/floor","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T22:29:48.275Z","lastSeenAt":"2026-04-23T00:32:38.712Z"}],"details":{"listingId":"307271d4-df0a-4bf1-bc8a-5de5654edad5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/16/floor \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge accepting USDC on Base network at 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/collections/16/floor"},{"claim":"Provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/collections/16/floor"}],"useCases":["Fetching the current floor price of a specific NFT collection","Integrating real-time NFT pricing into trading bots or dashboards","Agent-driven NFT market monitoring with per-call payment"],"bestFor":["Agents needing on-demand NFT floor prices without subscription commitments","Developers prototyping NFT analytics with minimal setup","Low-volume consumers who prefer pay-per-request over monthly plans"],"notFor":["High-frequency trading requiring sub-second latency guarantees (no SLA documented)","Users needing bulk historical floor price data (single-collection, single-call design)","Anyone requiring detailed API documentation or guaranteed schema stability"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:25.276Z"},"updatedAt":"2026-04-23T00:32:38.712Z"}}