{"id":"06c0a39a-cfcb-4f8a-813c-7f2ba906e94d","shortId":"zYm6Zp","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 returns floor-price data for NFT collection ID 21 via the x402 payment protocol on the Base network. It is part of a broader suite of pay-per-call APIs hosted at lowpaymentfee.com, all priced at $0.02 per request and settled in USDC on Base. No API keys or accounts are required — callers authenticate and pay by attaching an X-PAYMENT header with a valid x402 payment proof.\n\nThe specific path `/api/v1/collections/21/floor` is not listed on the provider's landing page, which instead showcases categories like Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. The collections/floor endpoint appears to be an NFT-related data endpoint, likely returning the current floor price for a specific collection. The response MIME type is `application/json`.\n\nThe provider advertises simple, flat pricing ($0.02 per request), no rate limits, and no minimum commitments. The x402 challenge confirms the endpoint is live, accepting POST requests, settling via the \"exact\" scheme in USDC (contract `0x8335…2913`) on Base mainnet. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02.","tags":[],"capabilities":["nft-floor-price","x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key","json-response"],"categories":["crypto","nft","data"],"synonyms":["NFT floor price API","collection floor price","NFT data endpoint","x402 NFT API","micropayment API","Base USDC API","NFT market data"],"warnings":["The endpoint path /api/v1/collections/21/floor is not listed among the provider's advertised APIs — it may be undocumented or experimental.","No request or response schema is available; the actual data returned is unknown.","All documentation pages (docs, api, pricing, README) returned only 'Connect wallet' with no substantive content.","Collection ID 21 is hardcoded in the path; it is unclear what collection this refers to or how to discover other collection IDs."],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/21/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/21/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 documentation of request/response formats, no examples, and the specific collections/floor endpoint is not even listed on the provider's own landing page. The docs, pricing, and API pages all returned only 'Connect wallet' with no useful 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'0.02':12,26,69,164,213 '000':204 '0x8335':193 '20':203 '21':40 '2913':194 '6':209 'Base USDC API' 'NFT data endpoint' 'NFT floor price API' 'NFT market data' 'accept':182 'account':82 'advertis':160 'ai':122 'amount':200 'analyt':121 'api':62,79 'appear':133 'application/json':157 'attach':90 'authent':86 'base':11,25,48,77,196,205 'base-network' 'broader':55 'call':61 'caller':85 'categori':118 'challeng':176 'collect':2,16,38,151 'collection floor price' 'collections/floor':131 'commit':173 'confirm':177 'contract':192 'current':145 'data':35,120,140 'decim':210 'endpoint':30,132,141,179 'equal':212 'exact':188 'financ':125 'flat':162 'floor':4,18,33,146 'floor-pric':3,17,32 'header':95 'host':63 'id':39 'infrastructur':128 'instead':116 'json-response' 'key':80 'land':113 'learn':124 'like':119,142 'limit':169 'list':108 'live':181 'lookup':6,20 'lowpaymentfee.com':65 'machin':123 'mainnet':197 'maximum':199 'micropay':9,23 'micropayment API' 'mime':154 'minimum':172 'network':49 'nft':1,15,37,138 'nft-floor-price' 'nft-relat':137 'no-api-key' 'page':114 'part':52 'path':104 'pay':59,88 'pay-per-cal':58 'pay-per-call' 'payment':44,94,100 'per':13,27,60,70,165 'post':183 'price':5,19,34,67,147,163 'proof':101 'protocol':45 'provid':111,159 'rate':168 'relat':139 'request':14,28,71,166,184 'requir':84,201 'respons':153 'return':31,143 'scheme':189 'settl':73,185 'showcas':117 'simpl':161 'specif':103,150 'suit':56 'type':155 'unit':206 'usdc':75,191,208 'usdc-settlement' 'util':129 'valid':98 'via':7,21,41,186 'web3':126 'x':93 'x-payment':92 'x402':8,22,43,99,175 'x402 NFT API' 'x402-payment'","prices":[{"id":"a3b1908c-1b29-4d55-b4f9-f0583baac9a1","listingId":"06c0a39a-cfcb-4f8a-813c-7f2ba906e94d","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/21/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":"2026-04-18T22:29:49.514Z"}],"sources":[{"listingId":"06c0a39a-cfcb-4f8a-813c-7f2ba906e94d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/21/floor","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T22:29:49.514Z","lastSeenAt":"2026-04-23T00:32:38.775Z"}],"details":{"listingId":"06c0a39a-cfcb-4f8a-813c-7f2ba906e94d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/21/floor \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\"","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 requiring USDC payment on Base","source_url":"https://lowpaymentfee.com/api/v1/collections/21/floor"},{"claim":"The provider advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/collections/21/floor"},{"claim":"maxAmountRequired is 20000 base units (USDC 6 decimals = $0.02)","source_url":"https://lowpaymentfee.com/api/v1/collections/21/floor"}],"useCases":["Retrieve the current floor price for a specific NFT collection programmatically","Build trading bots or dashboards that monitor NFT floor prices","Integrate NFT floor-price checks into agent workflows without managing API keys"],"bestFor":["Agents or bots needing on-demand NFT floor-price data with no signup","Developers who want to pay per call in USDC on Base without subscriptions","Automated pipelines that need simple, keyless API access to NFT market data"],"notFor":["High-volume bulk NFT data ingestion where per-call pricing becomes expensive","Users who need historical floor-price time series (no evidence this endpoint provides that)","Non-crypto users who cannot generate x402 payment proofs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:25.164Z"},"updatedAt":"2026-04-23T00:32:38.775Z"}}