{"id":"a03cad7e-c86b-4f44-8ada-336eee341010","shortId":"TZx2ek","kind":"x402","title":"NFT collection floor-price lookup via x402 micropayment on Base for $0.02 per request.","tagline":"NFT collection floor-price lookup via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns the floor price for NFT collection ID 4. It is part of a broader suite of x402-enabled APIs offered by the same provider, spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints on the platform share a uniform $0.02-per-request pricing model settled in USDC on the Base network.\n\nThe specific resource `/api/v1/collections/4/floor` accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers must include an `X-PAYMENT` header containing a signed payment of up to 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals). The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. No API keys, rate limits, or upfront commitments are required.\n\nDocumentation beyond the landing page is sparse — the /docs, /pricing, /api, and /README pages all resolve to a wallet-connect stub with no additional technical detail. The endpoint is confirmed live (returns a proper 402 challenge), but there is no OpenAPI schema, no example response body, and no documentation describing the response format or which collection ID 4 refers to. Use with the understanding that response structure must be discovered empirically.","tags":[],"capabilities":["nft-floor-price","x402-payment","usdc-base","micropayment","json-api","no-api-key"],"categories":["crypto","nft","finance"],"synonyms":["NFT floor price","collection floor","NFT pricing API","crypto collectibles","Base USDC payment","x402 NFT data","floor price lookup"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README all return only a wallet-connect stub","No OpenAPI or output schema provided; response format must be discovered empirically","It is unclear what NFT collection ID 4 refers to","The endpoint path suggests a specific collection; generalizability to other collection IDs is unconfirmed","The provider landing page lists many API categories but this specific collections/floor endpoint is not listed among them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/4/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/4/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 and returns a valid x402 402 challenge, confirming it works. However, there is no OpenAPI schema, no example responses, no documentation beyond a landing page listing, and no information about what collection ID 4 represents. The response format is entirely unknown. This is effectively a stub 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'/api/v1/collections/4/floor':95 '/docs':164 '/pricing':165 '/readme':168 '0.02':13,28,79,131 '000':125 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':143 '20':124 '4':43,214 '402':191 '6':135 'Base USDC payment' 'NFT floor price' 'NFT pricing API' 'accept':96 'addit':180 'address':142 'ai/ml':64 'analyt':63 'api':55,147 'base':11,26,90,126,145 'beyond':157 'bodi':202 'broader':49 'caller':109 'challeng':192 'collect':2,17,41,212 'collection floor' 'commit':153 'confirm':186 'connect':176 'contain':117 'crypto collectibles' 'data':62,67 'decim':136 'describ':206 'detail':182 'discov':226 'document':156,205 'empir':227 'enabl':54 'endpoint':32,72,184 'exampl':200 'finance/web3':66 'floor':4,19,37 'floor price lookup' 'floor-pric':3,18 'format':209 'handl':104 'header':116 'i.e':130 'id':42,213 'includ':111 'infer':65 'json':101 'json-api' 'key':148 'land':159 'limit':150 'live':187 'lookup':6,21 'lowpaymentfee.com':34 'micropay':9,24 'micropayment' 'model':84 'must':110,224 'network':91 'nft':1,16,40 'nft-floor-price' 'no-api-key' 'offer':56 'openapi':197 'page':160,169 'part':46 'payment':102,115,120,138 'per':14,29,81 'per-request':80 'platform':75 'post':97 'price':5,20,38,83 'proper':190 'protocol':108 'provid':60 'rate':149 'refer':215 'request':15,30,82,98 'requir':155 'resolv':171 'resourc':94 'respons':201,208,222 'return':35,100,188 'schema':198 'sent':140 'servic':70 'settl':85 'share':76 'sign':119 'sinc':132 'span':61 'spars':162 'specif':93 'structur':223 'stub':177 'suit':50 'technic':181 'understand':220 'uniform':78 'unit':127 'upfront':152 'usdc':87,129,133 'usdc-base' 'use':134,217 'util':69 'via':7,22,105 'wallet':175 'wallet-connect':174 'x':114 'x-payment':113 'x402':8,23,53,107 'x402 NFT data' 'x402-enabled':52 'x402-payment'","prices":[{"id":"04f4f0cd-0f37-4b9a-b922-6ac1d41543aa","listingId":"a03cad7e-c86b-4f44-8ada-336eee341010","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/4/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":"2026-04-19T05:29:57.028Z"}],"sources":[{"listingId":"a03cad7e-c86b-4f44-8ada-336eee341010","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/4/floor","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T05:29:57.028Z","lastSeenAt":"2026-04-22T01:02:00.642Z"}],"details":{"listingId":"a03cad7e-c86b-4f44-8ada-336eee341010","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/4/floor \\\n  -H \"X-PAYMENT: <signed-x402-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 of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/collections/4/floor"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/collections/4/floor"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The /docs, /pricing, /api, and /README pages contain only a wallet-connect prompt with no additional documentation","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieve the current floor price of a specific NFT collection programmatically","Integrate NFT market data into trading bots or portfolio dashboards","Demonstrate x402 micropayment flows with a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents needing on-demand NFT floor price data without API key management","Low-volume, pay-per-call NFT data consumers"],"notFor":["High-volume NFT analytics requiring bulk or batch queries (no documented batch endpoint)","Users who need detailed collection metadata, historical prices, or trait-level data","Anyone requiring comprehensive API documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:24.216Z"},"updatedAt":"2026-04-22T01:02:00.642Z"}}