{"id":"861b2cde-a440-4be0-b69d-95f02199608a","shortId":"MgQXaJ","kind":"x402","title":"NFT collection floor-price lookup via x402 micropayment on Base, $0.02 per request.","tagline":"NFT collection floor-price lookup via x402 micropayment on Base, $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns the floor price for NFT collection ID 7. It is part of a broader suite of pay-per-call APIs offered by lowpaymentfee.com, all settled via the x402 protocol on the Base network using USDC. The specific path `/api/v1/collections/7/floor` suggests an NFT or digital-asset collections data service, though the provider's landing page categorizes its offerings under Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure — this particular endpoint does not appear in the listed catalog, so its exact data source and response schema are unclear.\n\nPayment is handled inline: callers send an `X-PAYMENT` header containing a signed USDC payment on Base. The x402 challenge confirms the endpoint is live, accepting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per request. There are no API keys, no rate limits, and no subscription commitments — each call is independently settled on-chain. The payment recipient address is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, and the USDC asset contract is `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` (canonical USDC on Base).\n\nDocumentation is extremely sparse. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional content. No OpenAPI spec, example responses, or detailed field descriptions are available. The endpoint's output schema is not documented beyond `application/json` MIME type. Use with caution until richer documentation is published.","tags":[],"capabilities":["nft-floor-price","x402-payment","usdc-base","pay-per-request","collection-data"],"categories":["finance","nft","web3"],"synonyms":["NFT floor price API","collection floor price","NFT market data","x402 NFT endpoint","Base USDC micropayment API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — response format is unknown.","This specific endpoint (/api/v1/collections/7/floor) does not appear in the provider's published API catalog.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no useful content.","The nature of 'collection 7' is unspecified; it is unclear what NFT collection or data source this refers to."],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/7/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/7/floor","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documented response schema, no example responses, and the docs pages are empty. The specific endpoint (/collections/7/floor) is not even listed on the provider's own landing page, making its purpose and output largely inferred from the URL 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'0.02':12,26,158 '000':153 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':192 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':199 '20':152 '6':163 '7':41 'Base USDC micropayment API' 'NFT floor price API' 'NFT market data' 'accept':149 'addit':224 'address':190 'ai':96 'analyt':95 'api':54,170,211 'appear':108 'application/json':246 'asset':80,196 'avail':236 'base':11,25,66,140,154,203 'beyond':245 'broader':47 'call':53,180 'caller':127 'canon':200 'catalog':112 'categor':90 'caution':251 'chain':186 'challeng':143 'collect':2,16,39,81 'collection floor price' 'collection-data' 'commit':178 'confirm':144 'connect':219 'contain':134 'content':225 'contract':197 'data':82,94,116 'decim':164 'descript':234 'detail':232 'digit':79 'digital-asset':78 'doc':209 'document':204,244,254 'endpoint':30,105,146,238 'exact':115 'exampl':229 'extrem':206 'field':233 'financ':99 'floor':4,18,35 'floor-pric':3,17 'handl':125 'header':133 'id':40 'independ':182 'infrastructur':102 'inlin':126 'key':171 'land':88 'learn':98 'limit':174 'list':111 'live':148 'lookup':6,20 'lowpaymentfee' 'lowpaymentfee.com':32,57 'machin':97 'micropay':9,23 'mime':247 'network':67 'nft':1,15,38,76 'nft-floor-price' 'offer':55,92 'on-chain':184 'openapi':227 'output':240 'page':89,214 'part':44 'particular':104 'path':72 'pay':51 'pay-per-cal':50 'pay-per-request' 'payment':123,132,138,188 'per':13,27,52,165 'price':5,19,36,210 'prompt':221 'protocol':63 'provid':86 'publish':256 'rate':173 'readm':213 'recipi':189 'render':216 'request':14,28,166 'respons':119,230 'return':33 'richer':253 'schema':120,241 'send':128 'servic':83 'settl':59,183 'sign':136 'sinc':160 'sourc':117 'spars':207 'spec':228 'specif':71 'subscript':177 'suggest':74 'suit':48 'though':84 'type':248 'unclear':122 'unit':155 'usd':159 'usdc':69,137,157,161,195,201 'usdc-base' 'use':68,162,249 'via':7,21,60 'wallet':220 'web3':100 'x':131 'x-payment':130 'x402':8,22,62,142 'x402 NFT endpoint' 'x402-payment'","prices":[{"id":"d7d7ef70-7c97-42bc-a9fd-55a62239fa77","listingId":"861b2cde-a440-4be0-b69d-95f02199608a","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/7/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":"2026-04-19T05:29:50.544Z"}],"sources":[{"listingId":"861b2cde-a440-4be0-b69d-95f02199608a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/7/floor","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T05:29:50.544Z","lastSeenAt":"2026-04-22T23:02:26.775Z"}],"details":{"listingId":"861b2cde-a440-4be0-b69d-95f02199608a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/7/floor \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns 402 with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/collections/7/floor"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/collections/7/floor"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying the current floor price of a specific NFT collection","Building NFT portfolio trackers that need real-time floor data","Automated trading bots that check floor prices before bidding"],"bestFor":["Agents needing on-demand NFT floor prices without API key management","Micropayment-friendly workflows on Base L2","Quick, stateless lookups with no subscription overhead"],"notFor":["Bulk historical NFT price data (no batch or historical endpoint documented)","Users who cannot transact USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:24.671Z"},"updatedAt":"2026-04-22T23:02:26.775Z"}}