{"id":"beac0dc5-1e09-4ee4-98a8-ca3b3dad0866","shortId":"h8g5PH","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 41. It is part of a broader platform offering various pay-per-call APIs (data analytics, AI/ML, finance, crypto, infrastructure utilities) all settled via the x402 protocol on the Base network using USDC. Each request costs $0.02 (20,000 base units of USDC with 6 decimals). No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each POST request.\n\nThe specific endpoint `/api/v1/collections/41/floor` appears to serve NFT or digital-asset collection data, returning the current floor price for collection 41. The platform advertises itself under the tagline \"Premium API Access\" but the actual functionality is a straightforward per-call data endpoint. The x402 challenge confirms the endpoint is live, accepting payments to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.\n\nDocumentation is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no example request/response, and no description of what fields the response contains or what collection 41 refers to. The endpoint path suggests a RESTful collections API but specifics must be inferred.","tags":[],"capabilities":["nft-floor-price","x402-payment","usdc-settlement","base-network","per-call-pricing","no-api-key","collection-data"],"categories":["crypto","data"],"synonyms":["NFT floor price API","collection floor price","x402 NFT data","Base USDC micropayment API","lowpaymentfee","pay-per-call NFT API","crypto collection data"],"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","Collection 41 identity is not documented; unclear what asset or marketplace it refers to","No example responses available to verify data quality or format"],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/41/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/41/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 documented request/response schema, no examples, and the docs pages are empty. The specific collection (ID 41) and response format are entirely undocumented, making this effectively a stub 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'/request':14,28 '0.02':13,27,78 '000':80 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':164 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':168 '20':79 '41':41,129,213 '6':86 'Base USDC micropayment API' 'NFT floor price API' 'accept':160 'access':139 'account':91 'actual':142 'address':163 'advertis':132 'ai/ml':58 'analyt':57 'api':55,89,138,179,223 'appear':112 'asset':119 'attach':99 'base':11,25,71,81,170 'base-network' 'broader':47 'call':54,149 'caller':97 'challeng':154 'collect':2,16,39,120,128,212,222 'collection floor price' 'collection-data' 'confirm':155 'connect':185 'contain':209 'contract':167 'cost':77 'crypto':60 'crypto collection data' 'current':124 'data':56,121,150 'decim':87 'descript':203 'detail':192 'digit':118 'digital-asset':117 'doc':176 'document':171 'endpoint':30,110,151,157,217 'exampl':199 'extrem':173 'field':206 'financ':59 'floor':4,18,35,125 'floor-pric':3,17 'function':143 'header':103 'id':40 'infer':228 'infrastructur':61 'key':90 'limit':94 'live':159 'lookup':6,20 'lowpaymentfee' 'lowpaymentfee.com':32 'micropay':9,23 'must':226 'network':72 'nft':1,15,38,115 'nft-floor-price' 'no-api-key' 'offer':49 'openapi':196 'page':180 'part':44 'path':218 'pay':52 'pay-per-cal':51 'pay-per-call NFT API' 'payment':102,161 'per':53,148 'per-cal':147 'per-call-pricing' 'platform':48,131 'post':106 'premium':137 'price':5,19,36,126,177 'prompt':187 'protocol':68 'rate':93 'refer':214 'render':182 'request':76,107 'request/response':200 'requir':96 'respons':208 'rest':221 'return':33,122 'serv':114 'settl':64 'simpli':98 'spars':174 'spec':197 'specif':109,225 'straightforward':146 'suggest':219 'taglin':136 'technic':191 'unit':82 'usdc':74,84,166 'usdc-settlement' 'use':73 'util':62 'various':50 'via':7,21,65 'wallet':186 'x402':8,22,67,101,153 'x402 NFT data' 'x402-payment'","prices":[{"id":"36ea3668-32e2-45f7-92d5-2b7926485989","listingId":"beac0dc5-1e09-4ee4-98a8-ca3b3dad0866","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/41/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":"2026-04-19T05:29:51.135Z"}],"sources":[{"listingId":"beac0dc5-1e09-4ee4-98a8-ca3b3dad0866","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/41/floor","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T05:29:51.135Z","lastSeenAt":"2026-04-22T01:02:00.378Z"}],"details":{"listingId":"beac0dc5-1e09-4ee4-98a8-ca3b3dad0866","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/41/floor \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 with x402 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/collections/41/floor"},{"claim":"Price is $0.02 per request (20000 base units USDC, 6 decimals) on Base network","source_url":"https://lowpaymentfee.com/api/v1/collections/41/floor"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/collections/41/floor"}],"useCases":["Querying the current floor price of a specific NFT collection programmatically","Building trading bots that need real-time collection floor data","Integrating floor-price feeds into dashboards or portfolio trackers","Agent-driven NFT market analysis with per-call payment"],"bestFor":["Developers needing quick, keyless access to NFT floor prices","AI agents that can settle x402 micropayments on Base","Projects that want pay-per-use pricing without subscriptions"],"notFor":["Users needing bulk historical floor-price data (no batch endpoint documented)","Anyone without a Base-compatible USDC wallet for x402 settlement","Use cases requiring detailed collection metadata beyond floor price"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:24.524Z"},"updatedAt":"2026-04-22T01:02:00.378Z"}}