{"id":"4db9bb5f-77cb-4676-9440-d170e7926e66","shortId":"QNYxJP","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 the floor price for NFT collection ID 22 hosted on lowpaymentfee.com. It is part of a broader suite of pay-per-call APIs offered by the same provider, spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints use the x402 protocol on the Base network, settling in USDC.\n\nThe specific endpoint `/api/v1/collections/22/floor` accepts POST requests and returns JSON. Payment is handled via the x402 challenge-response flow: the caller includes an X-PAYMENT header with a signed USDC payment of up to 20,000 base units (i.e., $0.02 given USDC's 6 decimals) on Base. No API keys or accounts are required — access is granted purely through on-chain micropayment.\n\nDocumentation is extremely sparse. The provider's landing page lists available endpoints and pricing but the /docs, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples. The endpoint is confirmed live (returns a proper 402 challenge), but the actual response payload structure is unknown.","tags":[],"capabilities":["nft-floor-price","x402-payment","usdc-micropayment","base-network","pay-per-request","no-api-key"],"categories":["crypto","nft","finance"],"synonyms":["NFT floor price","collection floor price","NFT market data","NFT pricing API","crypto collectibles floor","x402 NFT API"],"warnings":["No documentation available — /docs, /pricing, /README all return only a wallet-connect prompt with no technical content","No OpenAPI or schema definition; request body and response format are completely unknown","The endpoint is scoped to a single collection (ID 22); it is unclear what collection this refers to or whether other collection IDs are supported","The provider site lists many endpoint categories (AI, analytics, finance, etc.) but none match this /collections/ path, suggesting this may be an unlisted or experimental endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/22/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/22/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 via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The specific purpose (collection 22 floor price) is inferred from the URL path alone. This is effectively a stub 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'/docs':165 '/pricing':166 '/readme':168 '0.02':12,26,125 '000':121 '20':120 '22':39 '402':203 '6':129 'NFT floor price' 'NFT market data' 'NFT pricing API' 'accept':88 'access':140 'account':137 'actual':207 'addit':179 'ai/ml':64 'analyt':63 'api':55,134 'avail':159 'base':11,25,79,122,132 'base-network' 'broader':48 'call':54 'caller':105 'chain':147 'challeng':101,204 'challenge-respons':100 'collect':2,16,37 'collection floor price' 'confirm':198 'connect':174 'crypto collectibles floor' 'data':62,67 'decim':130 'detail':181 'document':149,190 'endpoint':30,72,86,160,196 'exampl':194 'extrem':151 'finance/web3':66 'floor':4,18,33 'floor-pric':3,17 'flow':103 'given':126 'grant':142 'handl':96 'header':111 'host':40 'i.e':124 'id':38 'includ':106 'infer':65 'json':93 'key':135 'land':156 'list':158 'live':199 'lookup':6,20 'lowpaymentfee.com':42 'micropay':9,23,148 'network':80 'nft':1,15,36 'nft-floor-price' 'no-api-key' 'offer':56 'on-chain':145 'openapi':185 'page':157,169 'part':45 'pay':52 'pay-per-cal':51 'pay-per-request' 'payload':209 'payment':94,110,116 'per':13,27,53 'post':89 'price':5,19,34,162 'prompt':176 'proper':202 'protocol':76 'provid':60,154 'pure':143 'render':171 'request':14,28,90 'request/response':188 'requir':139 'respons':102,208 'return':31,92,200 'schema':189 'servic':70 'settl':81 'sign':114 'span':61 'spars':152 'spec':186 'specif':85 'structur':210 'suit':49 'technic':180 'unit':123 'unknown':212 'usag':193 'usdc':83,115,127 'usdc-micropayment' 'use':73 'util':69 'via':7,21,97 'wallet':175 'x':109 'x-payment':108 'x402':8,22,75,99 'x402 NFT API' 'x402-payment'","prices":[{"id":"8977aef0-0e01-464b-8e12-6045b828ddd1","listingId":"4db9bb5f-77cb-4676-9440-d170e7926e66","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/22/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":"2026-04-18T22:29:48.273Z"}],"sources":[{"listingId":"4db9bb5f-77cb-4676-9440-d170e7926e66","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/22/floor","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T22:29:48.273Z","lastSeenAt":"2026-04-23T02:02:01.920Z"}],"details":{"listingId":"4db9bb5f-77cb-4676-9440-d170e7926e66","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/22/floor \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/collections/22/floor"},{"claim":"All listed APIs cost $0.02 per request with no API keys, no rate limits, and settle on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/collections/22/floor"}],"useCases":["Querying the current floor price of a specific NFT collection programmatically","Building NFT portfolio dashboards that need real-time floor data","Automated trading bots that monitor NFT collection floors"],"bestFor":["Agents or bots that need on-demand NFT floor prices without API key management","Developers who prefer pay-per-call micropayments over subscription billing","x402-native workflows on the Base network"],"notFor":["High-frequency polling where $0.02 per request adds up quickly","Users who need floor prices for arbitrary collections (this endpoint is hardcoded to collection 22)","Anyone needing detailed NFT metadata, traits, or historical price charts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:25.277Z"},"updatedAt":"2026-04-23T02:02:01.920Z"}}