{"id":"458f3bc2-3843-467c-84e3-6d4d46352ad2","shortId":"4ehvVG","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 floor-price data for NFT collection ID 50. 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/50/floor` suggests it serves NFT or digital-asset collection floor prices, though the provider's landing page categorizes its offerings under Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.\n\nPayment is handled inline: callers send an `X-PAYMENT` header containing a signed x402 payment voucher. The x402 challenge confirms the endpoint is live (HTTP 402 returned) and accepts USDC on Base (contract 0x8335…2913) with a max amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The payment recipient address is 0x1A2B…85F3. No API keys or rate limits are advertised; access is purely pay-per-request.\n\nDocumentation is extremely thin — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint accepts POST requests based on the outputSchema in the x402 challenge. Because the actual response format is undocumented, consumers should expect a JSON response (mimeType is `application/json`) but will need to experiment to determine the exact schema.","tags":[],"capabilities":["nft-floor-price","x402-payment","usdc-base","pay-per-request","collection-data","json-api"],"categories":["finance","nft","data"],"synonyms":["NFT floor price API","collection floor price","NFT market data","x402 NFT API","Base USDC micropayment API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — response format is unknown","Docs, pricing, and API pages all render only 'Connect wallet' with no technical content","The specific endpoint path (/collections/50/floor) is not listed on the provider's landing page; its purpose is inferred from the URL pattern","No examples of request body or response body could be found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/50/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/50/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 request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The endpoint's actual behavior and response format are entirely 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'/request':14,28 '0.02':13,27,153 '000':148 '0x1a2b':163 '0x8335':140 '20':147 '2913':141 '402':132 '50':42 '6':156 '85f3':164 'Base USDC micropayment API' 'NFT floor price API' 'NFT market data' 'accept':135,217 'access':173 'actual':230 'address':161 'advertis':172 'ai':99 'amount':145 'analyt':98 'api':55,166,188 'application/json':243 'asset':83 'avail':214 'base':11,25,67,138,149,220 'broader':48 'call':54 'caller':110 'categor':93 'challeng':125,227 'collect':2,16,40,84 'collection floor price' 'collection-data' 'confirm':126 'connect':194 'consum':235 'contain':117 'contract':139 'data':37,97 'decim':157 'detail':201 'determin':250 'digit':82 'digital-asset':81 'doc':185 'document':180 'endpoint':30,128,216 'equal':152 'exact':252 'exampl':212 'expect':237 'experi':248 'extrem':182 'financ':102 'floor':4,18,35,85 'floor-pric':3,17,34 'format':232 'handl':108 'header':116 'http':131 'id':41 'infrastructur':105 'inlin':109 'json':239 'json-api' 'key':167 'land':91 'learn':101 'limit':170 'live':130 'lookup':6,20 'lowpaymentfee' 'lowpaymentfee.com':32,58 'machin':100 'max':144 'micropay':9,23 'mimetyp':241 'need':246 'network':68 'nft':1,15,39,79 'nft-floor-price' 'offer':56,95 'openapi':205 'outputschema':223 'page':92,189 'part':45 'path':74 'pay':52,177 'pay-per-cal':51 'pay-per-request':176 'payload':213 'payment':106,115,121,159 'per':53,178 'post':218 'price':5,19,36,86,186 'prompt':196 'protocol':64 'provid':89 'pure':175 'rate':169 'recipi':160 'render':191 'request':179,219 'request/response':208 'resourc':73 'respons':231,240 'return':33,133 'schema':209,253 'send':111 'serv':78 'settl':60 'sign':119 'spec':206 'specif':72 'suggest':76 'suit':49 'technic':200 'thin':183 'though':87 'undocu':234 'unit':150 'usdc':70,136,154 'usdc-base' 'use':69,155 'via':7,21,61 'voucher':122 'wallet':195 'web3':103 'x':114 'x-payment':113 'x402':8,22,63,120,124,226 'x402 NFT API' 'x402-payment'","prices":[{"id":"2934c7ed-ef56-4337-8b4a-ccc9594b1f71","listingId":"458f3bc2-3843-467c-84e3-6d4d46352ad2","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/50/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":"2026-04-19T00:59:35.230Z"}],"sources":[{"listingId":"458f3bc2-3843-467c-84e3-6d4d46352ad2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/50/floor","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T00:59:35.230Z","lastSeenAt":"2026-04-23T00:32:39.091Z"}],"details":{"listingId":"458f3bc2-3843-467c-84e3-6d4d46352ad2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/50/floor \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_signed_voucher>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns HTTP 402 with an x402 challenge accepting USDC on Base, maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/collections/50/floor"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/collections/50/floor"},{"claim":"All APIs priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying the current floor price of a specific NFT collection programmatically","Building trading bots or dashboards that need real-time NFT floor data","Agents that compare floor prices across collections before making purchase decisions"],"bestFor":["Developers needing on-demand NFT floor prices without API key management","AI agents with x402-compatible wallets on Base","Low-volume or sporadic queries where $0.02/call is cost-effective"],"notFor":["High-frequency bulk data ingestion (no documented batch endpoint or subscription)","Users who need detailed collection metadata, trait-level pricing, or historical charts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:24.794Z"},"updatedAt":"2026-04-23T00:32:39.091Z"}}