{"id":"5a4b6357-63d8-45b5-a7fa-c33d7990c26f","shortId":"qp5Cs3","kind":"x402","title":"NFT collection floor price data via x402 micropayment on Base network for $0.02/request.","tagline":"NFT collection floor price data via x402 micropayment on Base network for $0.02/request.","description":"This endpoint provides NFT collection floor price data, accessible at `/api/v1/collections/33/floor`. It is part of a broader suite of pay-per-request APIs hosted on lowpaymentfee.com, which spans data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints use the x402 payment protocol, settling in USDC on the Base network.\n\nThe specific endpoint returns floor price information for collection ID 33. Payment is handled via the x402 challenge-response mechanism: callers must include an X-PAYMENT header with a valid payment proof. The cost per request is 20,000 base units of USDC (6 decimals), which equals $0.02. No API keys or rate limits are advertised; access is gated solely by payment.\n\nDocumentation beyond the landing page is extremely sparse — the docs, API, 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 example payloads available. The endpoint is live and responds with a proper 402 challenge.","tags":[],"capabilities":["nft-floor-price","x402-payment","usdc-settlement","base-network","pay-per-request","collection-data"],"categories":["finance","web3","nft"],"synonyms":["NFT floor price","collection floor","NFT market data","crypto collection price","x402 NFT API","micropayment API"],"warnings":["No OpenAPI spec or schema documentation available","Docs, pricing, and README pages render only 'Connect wallet' with no content","No response schema or example responses documented — output format is unknown","Endpoint purpose inferred solely from URL path; no official description of what 'collections/33/floor' returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/33/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/33/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 with a valid 402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the docs pages are empty. The endpoint's purpose (collection floor price) is inferred from the URL path 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'/request':14,28 '0.02':13,27,129 '000':120 '20':119 '33':90 '402':194 '6':125 'NFT floor price' 'NFT market data' 'access':37,138 'addit':168 'advertis':137 'ai/ml':60 'analyt':59 'api':52,131,154 'avail':184 'base':10,24,78,121 'base-network' 'beyond':145 'broader':45 'caller':101 'challeng':98,195 'challenge-respons':97 'collect':2,16,33,88 'collection floor' 'collection-data' 'connect':163 'cost':115 'crypto collection price' 'data':5,19,36,58 'decim':126 'detail':170 'doc':153 'document':144,179 'endpoint':30,67,82,186 'equal':128 'exampl':182 'extrem':150 'finance/web3':62 'floor':3,17,34,84 'gate':140 'handl':93 'header':108 'host':53 'id':89 'includ':103 'infer':61 'inform':86 'infrastructur':64 'key':132 'land':147 'limit':135 'live':188 'lowpaymentfee.com':55 'mechan':100 'micropay':8,22 'micropayment API' 'must':102 'network':11,25,79 'nft':1,15,32 'nft-floor-price' 'openapi':174 'page':148,158 'part':42 'pay':49 'pay-per-request':48 'payload':183 'payment':71,91,107,112,143 'per':50,116 'price':4,18,35,85,155 'prompt':165 'proof':113 'proper':193 'protocol':72 'provid':31 'rate':134 'readm':157 'render':160 'request':51,117 'request/response':177 'respond':190 'respons':99 'return':83 'schema':178 'settl':73 'sole':141 'span':57 'spars':151 'spec':175 'specif':81 'suit':46 'technic':169 'unit':122 'usdc':75,124 'usdc-settlement' 'use':68 'util':65 'valid':111 'via':6,20,94 'wallet':164 'x':106 'x-payment':105 'x402':7,21,70,96 'x402 NFT API' 'x402-payment'","prices":[{"id":"10fe1578-79a6-4ae1-a41a-f5cd064ef55f","listingId":"5a4b6357-63d8-45b5-a7fa-c33d7990c26f","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/33/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":"2026-04-18T22:29:50.726Z"}],"sources":[{"listingId":"5a4b6357-63d8-45b5-a7fa-c33d7990c26f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/33/floor","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T22:29:50.726Z","lastSeenAt":"2026-04-23T00:32:38.817Z"}],"details":{"listingId":"5a4b6357-63d8-45b5-a7fa-c33d7990c26f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/33/floor \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\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 402 with x402 challenge accepting USDC on Base network at 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/collections/33/floor"},{"claim":"Site advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/collections/33/floor"}],"useCases":["Querying real-time NFT collection floor prices for trading bots","Monitoring NFT market conditions programmatically","Integrating floor price feeds into portfolio dashboards","Agent-driven NFT price discovery without API key management"],"bestFor":["Agents or bots needing on-demand NFT floor prices without subscription commitments","Developers wanting keyless, pay-per-call access to NFT data","Low-volume consumers who prefer micropayments over monthly plans"],"notFor":["High-volume consumers needing bulk historical NFT data at lower per-call cost","Users who need detailed collection metadata beyond floor price","Anyone without access to USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:25.065Z"},"updatedAt":"2026-04-23T00:32:38.817Z"}}