{"id":"546bcf89-728c-4552-aa7f-1fadf26736b6","shortId":"kq8bht","kind":"x402","title":"x402-gated product inventory endpoint on Base, pay-per-request with USDC.","tagline":"x402-gated product inventory endpoint on Base, pay-per-request with USDC.","description":"This endpoint at lowpaymentfee.com provides access to a product inventory resource (product ID 3) via the x402 payment protocol. The endpoint is live and returns a 402 challenge requiring payment in USDC on the Base network. The cost per request is $0.02 (20,000 base units of USDC with 6 decimals). Payment is made via the x402 \"exact\" scheme — a single per-call micropayment settled on-chain.\n\nThe hosting site lowpaymentfee.com offers a broad catalog of x402-gated APIs spanning data & analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and instant access.\n\nThis specific endpoint (`/api/v1/products/3/inventory`) is labeled \"Premium API Access\" in the x402 challenge description. No further documentation, request/response schema, or examples are provided by the site — the docs, pricing, and API pages all render only a wallet-connect prompt with no additional content. The exact nature of the \"inventory\" data returned is unclear from available material.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","product-inventory","http-post"],"categories":["commerce","data"],"synonyms":["product inventory API","x402 inventory endpoint","lowpaymentfee API","USDC micropayment API","Base network API","pay-per-call inventory"],"warnings":["No request or response schema available — the exact data returned by this endpoint is unknown.","Documentation pages (/docs, /api, /pricing, /README) all render only a wallet-connect prompt with no useful content.","The label 'Premium API Access' is generic and does not describe what the endpoint actually returns.","Cannot verify what 'products/3/inventory' contains without making a paid request."],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/3/inventory","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/products/3/inventory","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, but there is no documentation, no request/response schema, and no examples. The purpose of the 'inventory' resource is unclear. Docs pages render only a wallet-connect prompt with no 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'0.02':70,142 '000':72 '20':71 '3':42 '402':55 '6':78 'Base network API' 'USDC micropayment API' 'access':34,154,163 'addit':197 'ai/ml':114 'analyt':113 'api':110,147,162,185 'avail':210 'base':8,22,63,73 'broad':104 'call':92 'catalog':105 'chain':97 'challeng':56,167 'classif':118 'connect':193 'content':198 'convers':135 'cost':66 'data':112,205 'decim':79 'descript':168 'doc':182 'document':171 'embed':119 'endpoint':6,20,30,49,138,157 'estim':129 'exact':86,200 'exampl':175 'exchang':124 'feed':123 'financ':120 'gas':128 'gate':3,17,109 'generat':136 'geocod':133 'host':99 'http-post' 'id':41 'infer':115 'infrastructur':131 'instant':153 'inventori':5,19,38,204 'key':148 'label':160 'limit':151 'list':140 'live':51 'lowpaymentfee API' 'lowpaymentfee.com':32,101 'made':82 'materi':211 'micropay':93 'natur':201 'network':64 'offer':102 'on-chain':95 'page':186 'pay':10,24 'pay-per-call inventory' 'pay-per-request':9,23 'payment':46,58,80 'per':11,25,67,91,143 'per-cal':90 'per-request-micropayment' 'premium':161 'price':122,183 'product':4,18,37,40 'product inventory API' 'product-inventory' 'prompt':194 'protocol':47 'provid':33,177 'quot':127 'rate':125,150 'render':188 'request':12,26,68,144 'request/response':172 'requir':57 'resourc':39 'return':53,206 'schema':173 'scheme':87 'sentiment':116 'settl':94 'singl':89 'site':100,180 'span':111 'specif':156 'summar':117 'token':126 'unclear':208 'unit':74 'usdc':14,28,60,76 'usdc-base' 'util':132 'valid':134 'via':43,83 'wallet':192 'wallet-connect':191 'web3':121 'x402':2,16,45,85,108,166 'x402 inventory endpoint' 'x402-gated':1,15,107 'x402-payment'","prices":[{"id":"ad0af514-2ece-4c5f-ba52-eac4b1d54c07","listingId":"546bcf89-728c-4552-aa7f-1fadf26736b6","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/products/3/inventory","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:38.734Z"}],"sources":[{"listingId":"546bcf89-728c-4552-aa7f-1fadf26736b6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/3/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:38.734Z","lastSeenAt":"2026-04-22T15:00:50.666Z"}],"details":{"listingId":"546bcf89-728c-4552-aa7f-1fadf26736b6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/3/inventory \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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 network","source_url":"https://lowpaymentfee.com/api/v1/products/3/inventory"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/products/3/inventory"},{"claim":"Site lists all APIs at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Site offers APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying product inventory data with per-request USDC micropayments","Integrating x402 payment-gated data into agent workflows","Accessing inventory information without API keys or subscriptions"],"bestFor":["Agents or apps that can settle x402 payments on Base","Developers wanting keyless, pay-per-use API access","Micropayment-native workflows needing inventory data"],"notFor":["Users who need detailed API documentation or response schemas before integrating","Applications requiring free or subscription-based access without on-chain payments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.223Z"},"updatedAt":"2026-04-22T15:00:50.666Z"}}