{"id":"9bfcff29-5e45-4442-92c3-883fac8465cb","shortId":"4qWZC6","kind":"x402","title":"NFT collection floor-price data via x402 micropayment on Base, $0.02 per request.","tagline":"NFT collection floor-price data via x402 micropayment on Base, $0.02 per request.","description":"This endpoint returns floor-price data for NFT collection ID 43 via the x402 payment protocol on the Base network. It is part of a broader suite of pay-per-call APIs hosted at lowpaymentfee.com, which spans data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per request settled in USDC on Base.\n\nThe specific resource at `/api/v1/collections/43/floor` accepts POST requests and returns JSON. Payment is handled inline via the x402 protocol: callers attach an `X-PAYMENT` header containing a signed USDC payment of up to 20,000 base units (i.e., $0.02, since USDC uses 6 decimals). The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base mainnet. No API keys or accounts are required — access is granted per-request upon valid payment.\n\nDocumentation beyond the landing page is extremely sparse; the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no example request/response payloads, and no description of what fields the floor-price response contains or which collection ID 43 refers to. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation limits confidence in what exactly is returned.","tags":[],"capabilities":["nft-floor-price","x402-payment","usdc-micropayment","base-network","pay-per-request","no-api-key"],"categories":["finance","web3","nft"],"synonyms":["NFT floor price API","collection floor price","NFT market data","x402 NFT endpoint","micropayment NFT API","Base USDC API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all return only a wallet-connect prompt with no content.","No OpenAPI or schema describing request parameters or response fields.","Collection ID 43 is unidentified; it is unclear which NFT collection this refers to.","The endpoint path suggests a specific collection; generalizability to other collection IDs is unknown.","This endpoint is not listed on the provider's own landing page among their advertised APIs."],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/43/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/43/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 with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no examples, and no indication of what collection 43 is. The docs pages are all empty wallet-connect stubs. This is effectively a stub 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'/api/v1/collections/43/floor':91 '/docs':167 '/pricing':168 '/readme':171 '0.02':12,26,79,126 '000':122 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':138 '20':121 '402':221 '43':40,210 '6':130 'Base USDC API' 'NFT floor price API' 'NFT market data' 'accept':92 'access':149 'account':146 'addit':182 'address':137 'ai/ml':70 'analyt':69 'api':62,143 'attach':107 'base':11,25,48,86,123,140 'base-network' 'beyond':159 'broader':55 'call':61 'caller':106 'challeng':222 'collect':2,16,38,208 'collection floor price' 'confid':229 'confirm':216 'connect':177 'contain':113,205 'data':6,20,35,68 'decim':131 'descript':196 'detail':184 'document':158,227 'endpoint':30,214 'exact':232 'exampl':191 'extrem':164 'field':199 'finance/web3':72 'floor':4,18,33,202 'floor-pric':3,17,32,201 'grant':151 'handl':100 'header':112 'host':63 'i.e':125 'id':39,209 'infer':71 'infrastructur':74 'inlin':101 'json':97 'key':144 'lack':225 'land':161 'limit':228 'live':217 'lowpaymentfee.com':65 'mainnet':141 'micropay':9,23 'micropayment NFT API' 'network':49 'nft':1,15,37 'nft-floor-price' 'no-api-key' 'openapi':188 'page':162,172 'part':52 'pay':59 'pay-per-cal':58 'pay-per-request' 'payload':193 'payment':44,98,111,117,133,157 'per':13,27,60,80,153 'per-request':152 'post':93 'price':5,19,34,77,203 'prompt':179 'proper':220 'protocol':45,105 'refer':211 'render':174 'request':14,28,81,94,154 'request/response':192 'requir':148 'resourc':89 'respons':204 'return':31,96,218,234 'sent':135 'settl':82 'sign':115 'sinc':127 'span':67 'spars':165 'spec':189 'specif':88 'suit':56 'technic':183 'unit':124 'upon':155 'usdc':84,116,128 'usdc-micropayment' 'use':129 'util':75 'valid':156 'via':7,21,41,102 'wallet':178 'x':110 'x-payment':109 'x402':8,22,43,104 'x402 NFT endpoint' 'x402-payment'","prices":[{"id":"5df831bd-360b-4dfc-a243-3e1dd3ebae91","listingId":"9bfcff29-5e45-4442-92c3-883fac8465cb","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/43/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":"2026-04-19T05:29:55.806Z"}],"sources":[{"listingId":"9bfcff29-5e45-4442-92c3-883fac8465cb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/43/floor","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T05:29:55.806Z","lastSeenAt":"2026-04-22T23:02:27.051Z"}],"details":{"listingId":"9bfcff29-5e45-4442-92c3-883fac8465cb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/43/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":"Endpoint returns HTTP 402 with x402 challenge requiring USDC payment on Base","source_url":"https://lowpaymentfee.com/api/v1/collections/43/floor"},{"claim":"maxAmountRequired is 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/collections/43/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"},{"claim":"Docs, pricing, API, and README pages render only a Connect wallet prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching real-time floor prices for a specific NFT collection","Integrating NFT market data into trading bots or dashboards","Agent-driven NFT price monitoring with per-call micropayments"],"bestFor":["Developers needing keyless, pay-per-call NFT floor data","AI agents that can settle x402 payments on Base","Quick prototyping without subscription commitments"],"notFor":["Bulk historical NFT data retrieval (no batch or historical endpoints documented)","Users who need detailed collection metadata beyond floor price","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:24.323Z"},"updatedAt":"2026-04-22T23:02:27.051Z"}}