{"id":"008510b5-8935-4062-9a16-8d48c0ad2149","shortId":"MN5Fv9","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 floor-price data for NFT collection ID 3. 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 resource path `/api/v1/collections/3/floor` suggests it serves NFT or digital-asset collection floor prices, though the provider's landing page categorizes its finance endpoints under \"Finance & Web3\" with price feeds, exchange rates, token quotes, and gas estimates.\n\nPayment is handled inline: callers receive a 402 challenge specifying an exact-scheme USDC payment of up to 20,000 base units (i.e., $0.02 given USDC's 6 decimals) to the provider's address on Base. No API keys, subscriptions, or rate limits are advertised — each request is independently paid. The response MIME type is `application/json`.\n\nDocumentation is extremely thin. The landing page lists many endpoints at $0.02 each but provides no request/response schemas, parameter descriptions, or example payloads. The `/docs`, `/api`, `/pricing`, and `/README` pages all render only a \"Connect wallet\" prompt with no further content. Because of this, the exact request body format and response structure for the collections floor endpoint are unknown and must be discovered experimentally.","tags":[],"capabilities":["nft-floor-price","x402-payment","usdc-settlement","base-network","pay-per-request","json-api"],"categories":["finance","web3","nft"],"synonyms":["NFT floor price","collection floor","NFT valuation","floor price API","crypto collectibles price","x402 NFT data","micropayment API"],"warnings":["No request or response schema available — callers must discover the API contract experimentally.","All documentation pages (/docs, /api, /pricing, /README) return only a 'Connect wallet' prompt with no useful content.","The specific NFT collection referenced by ID 3 is unidentified; it is unclear what collection's floor price is returned.","The landing page does not list this specific /collections/3/floor endpoint among its advertised APIs, so it may be undocumented or experimental."],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/3/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/3/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 captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, no examples, and the specific collection (ID 3) is unidentified. Effectively a stub 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'/api/v1/collections/3/floor':75 '/docs':191 '/pricing':193 '/readme':195 '0.02':12,26,134,178 '000':130 '20':129 '3':42 '402':117 '6':138 'NFT floor price' 'NFT valuation' 'address':144 'advertis':155 'api':55,148 'application/json':166 'asset':83 'base':11,25,67,131,146 'base-network' 'bodi':214 'broader':48 'call':54 'caller':114 'categor':93 'challeng':118 'collect':2,16,40,84,221 'collection floor' 'connect':201 'content':207 'crypto collectibles price' 'data':37 'decim':139 'descript':186 'digit':82 'digital-asset':81 'discov':229 'document':167 'endpoint':30,96,176,223 'estim':109 'exact':122,212 'exact-schem':121 'exampl':188 'exchang':103 'experiment':230 'extrem':169 'feed':102 'financ':95,98 'floor':4,18,35,85,222 'floor price API' 'floor-pric':3,17,34 'format':215 'gas':108 'given':135 'handl':112 'i.e':133 'id':41 'independ':159 'inlin':113 'json-api' 'key':149 'land':91,172 'limit':153 'list':174 'lookup':6,20 'lowpaymentfee.com':32,58 'mani':175 'micropay':9,23 'micropayment API' 'mime':163 'must':227 'network':68 'nft':1,15,39,79 'nft-floor-price' 'offer':56 'page':92,173,196 'paid':160 'paramet':185 'part':45 'path':74 'pay':52 'pay-per-cal':51 'pay-per-request' 'payload':189 'payment':110,125 'per':13,27,53 'price':5,19,36,86,101 'prompt':203 'protocol':64 'provid':89,142,181 'quot':106 'rate':104,152 'receiv':115 'render':198 'request':14,28,157,213 'request/response':183 'resourc':73 'respons':162,217 'return':33 'schema':184 'scheme':123 'serv':78 'settl':60 'specif':72 'specifi':119 'structur':218 'subscript':150 'suggest':76 'suit':49 'thin':170 'though':87 'token':105 'type':164 'unit':132 'unknown':225 'usdc':70,124,136 'usdc-settlement' 'use':69 'via':7,21,61 'wallet':202 'web3':99 'x402':8,22,63 'x402 NFT data' 'x402-payment'","prices":[{"id":"b153b664-cfea-4e29-a172-20844658f61e","listingId":"008510b5-8935-4062-9a16-8d48c0ad2149","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/3/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":"2026-04-19T00:29:50.276Z"}],"sources":[{"listingId":"008510b5-8935-4062-9a16-8d48c0ad2149","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/3/floor","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T00:29:50.276Z","lastSeenAt":"2026-04-23T00:32:38.969Z"}],"details":{"listingId":"008510b5-8935-4062-9a16-8d48c0ad2149","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/3/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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (asset 0x8335…) on Base via x402 exact scheme.","source_url":"https://lowpaymentfee.com/api/v1/collections/3/floor"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC on Base uses 6 decimals, so 20,000 base units equals $0.02.","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching the current floor price of a specific NFT collection for trading bots","Displaying real-time NFT collection valuations in dashboards","Automated portfolio tracking that needs on-demand floor price lookups","Agent-driven NFT arbitrage requiring per-call pricing data"],"bestFor":["Agents or bots needing on-demand NFT floor prices without API key management","Low-volume or sporadic callers who prefer pay-per-request over subscriptions","x402-native workflows on the Base network settling in USDC"],"notFor":["High-frequency bulk data consumers who need websocket streams or flat-rate plans","Users who need detailed collection metadata, trait analysis, or historical charts","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:24.946Z"},"updatedAt":"2026-04-23T00:32:38.969Z"}}