{"id":"b1ac1799-f98d-406c-abd4-78538f671415","shortId":"YzAUKU","kind":"x402","title":"NFT collection floor-price data via x402 micropayment on Base, $0.02 per request.","tagline":"NFT collection floor-price data via x402 micropayment on Base, $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns floor-price data for NFT collection ID 9. 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 endpoint path `/api/v1/collections/9/floor` suggests it serves NFT or digital-asset collection floor-price information, though the provider's landing page categorizes its offerings broadly under Data & Analytics, AI & ML, Finance & Web3, and Infrastructure.\n\nPayment is handled inline: callers send an `X-PAYMENT` header containing a signed x402 payment envelope. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 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 contract used is `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base mainnet.\n\nDocumentation is extremely sparse. The crawled docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no example responses, and no detailed description of the response format beyond the stated MIME type of `application/json`. The endpoint is confirmed live (returns a proper 402 challenge), but the actual data quality and response structure are unknown.","tags":[],"capabilities":["nft-floor-price","x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","collection-data"],"categories":["finance","nft","data"],"synonyms":["NFT floor price API","collection floor price","NFT market data","x402 NFT data","crypto collection floor","Base USDC API","micropayment API"],"warnings":["No OpenAPI or response schema available — response format is unknown","Documentation pages (/docs, /api, /pricing, /README) all returned only 'Connect wallet' with no content","The endpoint path suggests NFT collection data but this is inferred from the URL; no provider documentation confirms it","No SLA, rate-limit, or uptime guarantees documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/9/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/9/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 response format, no example responses, and the crawled documentation pages are empty. The specific purpose (NFT collection floor price) is inferred from the URL path 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'0.02':12,26,140 '000':131 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':168 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':175 '20':130 '402':232 '6':136 '9':42 'Base USDC API' 'NFT floor price API' 'NFT market data' 'actual':236 'address':166 'ai':102 'amount':127 'analyt':101 'api':55,146,188 'application/json':223 'asset':83 'base':11,25,67,132,177 'base-network' 'beyond':217 'broad':98 'broader':48 'call':54,156 'caller':112 'categor':95 'chain':162 'challeng':233 'collect':2,16,40,84 'collection floor price' 'collection-data' 'commit':154 'confirm':227 'connect':194 'contain':119 'content':200 'contract':172 'crawl':184 'crypto collection floor' 'data':6,20,37,100,237 'decim':137 'descript':212 'detail':211 'digit':82 'digital-asset':81 'doc':185 'document':179 'endpoint':30,73,225 'envelop':124 'equal':139 'exampl':207 'extrem':181 'financ':104 'floor':4,18,35,86 'floor-pric':3,17,34,85 'format':216 'handl':110 'header':118 'id':41 'independ':158 'inform':88 'infrastructur':107 'inlin':111 'key':147 'land':93 'limit':150 'live':228 'lowpaymentfee.com':32,58 'mainnet':178 'maximum':126 'micropay':9,23 'micropayment API' 'mime':220 'ml':103 'network':68 'nft':1,15,39,79 'nft-floor-price' 'no-api-key' 'offer':56,97 'on-chain':160 'openapi':204 'page':94,189 'part':45 'path':74 'pay':52 'pay-per-cal':51 'pay-per-request' 'payment':108,117,123,164 'per':13,27,53,141 'price':5,19,36,87,186 'prompt':196 'proper':231 'protocol':64 'provid':91 'qualiti':238 'rate':149 'recipi':165 'request':14,28,142 'requir':128 'respons':208,215,240 'return':33,191,229 'schema':205 'send':113 'serv':78 'settl':60,159 'sign':121 'spars':182 'specif':72 'state':219 'structur':241 'subscript':153 'suggest':76 'suit':49 'though':89 'type':221 'unit':133 'unknown':243 'usdc':70,135,171 'usdc-settlement' 'use':69,173 'via':7,21,61 'wallet':195 'web3':105 'x':116 'x-payment':115 'x402':8,22,63,122 'x402 NFT data' 'x402-payment'","prices":[{"id":"3227d9b4-1ff0-4a0a-845f-bb25c535d616","listingId":"b1ac1799-f98d-406c-abd4-78538f671415","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/9/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":"2026-04-19T05:29:49.394Z"}],"sources":[{"listingId":"b1ac1799-f98d-406c-abd4-78538f671415","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/9/floor","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T05:29:49.394Z","lastSeenAt":"2026-04-22T23:02:26.751Z"}],"details":{"listingId":"b1ac1799-f98d-406c-abd4-78538f671415","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/9/floor \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-envelope>\"","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/9/floor"},{"claim":"maxAmountRequired is 20000 base units of USDC (USD Coin, 6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/collections/9/floor"},{"claim":"Provider advertises $0.02/request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/collections/9/floor"}],"useCases":["Querying real-time floor prices for NFT collections programmatically","Building trading bots or dashboards that need on-demand NFT pricing","Agent-driven portfolio valuation that requires per-call NFT floor data"],"bestFor":["Developers needing low-cost, keyless NFT floor-price lookups","AI agents that can settle x402 payments autonomously on Base","Applications requiring pay-as-you-go pricing with no subscription overhead"],"notFor":["Users who need bulk historical NFT floor-price data (no batch endpoint documented)","Applications that cannot settle USDC payments on the Base network","Users requiring detailed documentation or SLA guarantees before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:24.553Z"},"updatedAt":"2026-04-22T23:02:26.751Z"}}