{"id":"3a313d65-08a2-422c-bc21-f3e0d7f31cfa","shortId":"3F2ZWM","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 the floor price for NFT collection ID 19. It is part of a broader suite of pay-per-call APIs offered by lowpaymentfee.com, all priced at $0.02 per request and settled in USDC on the Base network via the x402 protocol. No API keys or accounts are required — callers simply attach an x402 payment header with each request.\n\nThe specific endpoint `/api/v1/collections/19/floor` accepts POST requests and returns JSON. Based on the URL structure, it appears to serve NFT collection floor-price data, though the provider's landing page categorizes its APIs into Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure — this particular endpoint is not explicitly listed on the homepage. The x402 challenge confirms the endpoint is live, accepting USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with a max amount of 20,000 base units ($0.02 given USDC's 6 decimals).\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /pricing, /api, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint's exact input parameters and response format must be discovered experimentally.","tags":[],"capabilities":["nft-floor-price","x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response"],"categories":["crypto","nft","finance"],"synonyms":["NFT floor price API","collection floor price","NFT market data","x402 NFT API","micropayment API","Base USDC API","lowpaymentfee"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all return only a wallet-connect prompt","This specific endpoint (/api/v1/collections/19/floor) is not listed on the provider's homepage; its exact purpose is inferred from the URL","No request or response schema is documented; input parameters and output format are unknown","The provider site lists many diverse API categories but none appear to match NFT collection data, raising questions about what this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/19/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/19/floor","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The specific endpoint is not even listed on the provider's homepage. Effectively a stub 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'/api/v1/collections/19/floor':96 '/docs':185 '/pricing':186 '/readme':189 '/request':14,28 '0.02':13,27,61,170 '000':167 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':158 '19':41 '20':166 '6':174 'Base USDC API' 'NFT floor price API' 'NFT market data' 'accept':97,155 'account':80 'ai':130 'amount':164 'analyt':129 'api':54,77,126 'appear':109 'attach':85 'avail':215 'base':11,25,70,103,160,168 'base-network' 'beyond':177 'broader':47 'call':53 'caller':83 'categor':124 'challeng':149 'collect':2,16,39,113 'collection floor price' 'confirm':150 'connect':195 'content':201 'contract':157 'crawl':218 'data':117,128 'decim':175 'discov':230 'document':176,210 'endpoint':30,95,139,152,220 'exact':222 'exampl':214 'experiment':231 'explicit':142 'extrem':182 'financ':133 'floor':4,18,35,115 'floor-pric':3,17,114 'format':227 'given':171 'header':89 'homepag':146 'id':40 'infrastructur':136 'input':223 'json':102 'json-response' 'key':78 'land':122,179 'learn':132 'list':143 'live':154 'lookup':6,20 'lowpaymentfee' 'lowpaymentfee.com':32,57 'machin':131 'max':163 'micropay':9,23 'micropayment API' 'must':228 'network':71 'nft':1,15,38,112 'nft-floor-price' 'no-api-key' 'offer':55 'openapi':205 'page':123,180,190 'paramet':224 'part':44 'particular':138 'pay':51 'pay-per-cal':50 'pay-per-request' 'payment':88 'per':52,62 'post':98 'price':5,19,36,59,116 'prompt':197 'protocol':75 'provid':120 'request':63,92,99 'request/response':208 'requir':82 'respons':226 'return':33,101,192 'schema':209 'serv':111 'settl':65 'simpli':84 'spars':183 'spec':206 'specif':94 'structur':107 'substant':200 'suit':48 'though':118 'unit':169 'url':106 'usag':213 'usdc':67,156,172 'usdc-settlement' 'via':7,21,72 'wallet':196 'web3':134 'x402':8,22,74,87,148 'x402 NFT API' 'x402-payment'","prices":[{"id":"f1bbc7b2-6e4b-4526-a223-5b699d8f3471","listingId":"3a313d65-08a2-422c-bc21-f3e0d7f31cfa","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/19/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":"2026-04-19T00:29:50.320Z"}],"sources":[{"listingId":"3a313d65-08a2-422c-bc21-f3e0d7f31cfa","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/19/floor","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T00:29:50.320Z","lastSeenAt":"2026-04-22T02:31:45.806Z"}],"details":{"listingId":"3a313d65-08a2-422c-bc21-f3e0d7f31cfa","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/19/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 HTTP 402 with an x402 challenge requiring USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/collections/19/floor"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/collections/19/floor"},{"claim":"maxAmountRequired is 20000 base units ($0.02 USDC)","source_url":"https://lowpaymentfee.com/api/v1/collections/19/floor"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying the current floor price of a specific NFT collection programmatically","Building NFT portfolio trackers that need real-time floor data","Agents that monitor NFT market conditions and trigger alerts"],"bestFor":["Developers needing quick, keyless NFT floor-price lookups","AI agents that can settle x402 micropayments on Base","Low-volume or sporadic queries where $0.02/call is cost-effective"],"notFor":["High-frequency trading requiring sub-second latency guarantees (no SLA documented)","Users who need detailed collection metadata, historical charts, or batch queries","Anyone without a Base-compatible USDC wallet for x402 payments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:24.939Z"},"updatedAt":"2026-04-22T02:31:45.806Z"}}