{"id":"c00711e0-ab51-4f1f-832e-450b4b456d0f","shortId":"pHp2G8","kind":"x402","title":"NFT collection floor-price lookup via x402 micropayment on Base for $0.02/request","tagline":"NFT collection floor-price lookup via x402 micropayment on Base for $0.02/request","description":"This endpoint at lowpaymentfee.com returns the floor price for NFT collection ID 6. It is part of a broader suite of pay-per-call APIs offered by lowpaymentfee.com, all priced at $0.02 per request and settled in USDC on the Base network via the x402 protocol. No API keys or accounts are required — callers simply attach an x402 payment header with each request.\n\nThe specific endpoint `/api/v1/collections/6/floor` accepts POST requests and returns JSON. Based on the URL structure, it appears to serve floor-price data for a particular NFT or token collection (collection ID 6). The provider's site groups this under \"Finance & Web3\" alongside price feeds, exchange rates, token quotes, and gas estimates, though this specific collections endpoint is not explicitly listed on the landing page.\n\nThe x402 challenge confirms the endpoint is live, accepting USDC payments (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The payment recipient is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. Timeout is 300 seconds. No OpenAPI schema, detailed documentation, or example responses were found in the crawl.","tags":[],"capabilities":["nft-floor-price","x402-payment","usdc-base","pay-per-request","json-api","no-api-key"],"categories":["finance","web3","nft"],"synonyms":["NFT floor price","collection floor price","NFT market data","floor price API","crypto collection data","x402 NFT API"],"warnings":["No API documentation or OpenAPI schema available — request/response format is unknown","This specific endpoint (/api/v1/collections/6/floor) is not listed on the provider's landing page; its exact purpose is inferred from the URL","All documentation pages (docs, api, pricing, README) returned only a 'Connect wallet' stub with no content","Collection ID 6 is hardcoded in the URL; it is unclear what collection this refers to or whether other IDs are valid"],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/6/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/6/floor","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documented request/response format, no example payloads, and the specific collections endpoint is not listed on the provider's landing page. The docs, pricing, and API pages all returned only a 'Connect wallet' stub with no useful 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'/request':14,28 '0.02':13,27,61,184 '000':180 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':194 '0x8335':170 '20':179 '2913':171 '300':197 '6':41,125,188 'NFT floor price' 'NFT market data' 'accept':97,166 'account':80 'alongsid':135 'amount':177 'api':54,77 'appear':109 'attach':85 'base':11,25,70,103,173,181 'broader':47 'call':53 'caller':83 'challeng':160 'collect':2,16,39,122,123,148 'collection floor price' 'confirm':161 'contract':169 'crawl':211 'crypto collection data' 'data':115 'decim':189 'detail':202 'document':203 'endpoint':30,95,149,163 'estim':144 'exampl':205 'exchang':138 'explicit':152 'feed':137 'financ':133 'floor':4,18,35,113 'floor price API' 'floor-pric':3,17,112 'found':208 'gas':143 'given':185 'group':130 'header':89 'i.e':183 'id':40,124 'json':102 'json-api' 'key':78 'land':156 'list':153 'live':165 'lookup':6,20 'lowpaymentfee.com':32,57 'maximum':176 'micropay':9,23 'network':71 'nft':1,15,38,119 'nft-floor-price' 'no-api-key' 'offer':55 'openapi':200 'page':157 'part':44 'particular':118 'pay':51 'pay-per-cal':50 'pay-per-request' 'payment':88,168,191 'per':52,62 'post':98 'price':5,19,36,59,114,136 'protocol':75 'provid':127 'quot':141 'rate':139 'recipi':192 'request':63,92,99 'requir':82 'respons':206 'return':33,101 'schema':201 'second':198 'serv':111 'settl':65 'simpli':84 'site':129 'specif':94,147 'structur':107 'suit':48 'though':145 'timeout':195 'token':121,140 'unit':182 'url':106 'usdc':67,167,186 'usdc-base' 'via':7,21,72 'web3':134 'x402':8,22,74,87,159 'x402 NFT API' 'x402-payment'","prices":[{"id":"3ffb148d-043a-4f1e-89aa-1592a36096c2","listingId":"c00711e0-ab51-4f1f-832e-450b4b456d0f","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/6/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":"2026-04-19T05:29:57.625Z"}],"sources":[{"listingId":"c00711e0-ab51-4f1f-832e-450b4b456d0f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/6/floor","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T05:29:57.625Z","lastSeenAt":"2026-04-22T23:02:27.096Z"}],"details":{"listingId":"c00711e0-ab51-4f1f-832e-450b4b456d0f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/6/floor \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requiring USDC payment on Base","source_url":"https://lowpaymentfee.com/api/v1/collections/6/floor"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/collections/6/floor"},{"claim":"Payment recipient address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/collections/6/floor"}],"useCases":["Querying the current floor price of a specific NFT collection programmatically","Building trading bots or dashboards that need real-time NFT floor data","Agent-driven portfolio valuation that includes NFT holdings"],"bestFor":["Developers needing low-cost, keyless NFT floor-price lookups","AI agents that can settle x402 micropayments on Base","Applications requiring on-demand NFT market data without subscription commitments"],"notFor":["Bulk historical NFT price data (no batch or historical endpoint documented)","Users who cannot transact in USDC on the Base network","Production use cases requiring detailed API documentation or SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:24.209Z"},"updatedAt":"2026-04-22T23:02:27.096Z"}}