{"id":"1c146b35-79ed-4759-ab69-db89772bd183","shortId":"vRaKEy","kind":"x402","title":"x402-gated product inventory endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated product inventory endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com provides access to a product inventory resource (product ID 81) via the x402 payment protocol. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 0.02 USDC per request (20,000 base units at 6 decimals).\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that offers a variety of x402-gated APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request. The platform advertises no API keys, no rate limits, and instant access; callers simply attach an x402 payment header to each request.\n\nThe specific functionality of this particular endpoint — product inventory lookup — is not well-documented. The landing page lists many other endpoints but does not explicitly list this /products/81/inventory route, so its request schema, expected input fields, and response format are unknown. The x402 challenge confirms the endpoint is live and accepting payment-gated POST requests, but without further documentation or example responses, the exact data returned remains unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","product-inventory","pay-per-call","no-api-key","json-response"],"categories":["commerce","data"],"synonyms":["product inventory API","x402 inventory endpoint","USDC pay-per-call API","lowpaymentfee inventory","Base network API","product stock check","402 payment API"],"warnings":["No documentation found for this specific endpoint (/api/v1/products/81/inventory); it is not listed among the advertised APIs on the landing page.","No request or response schema available — input fields and output format are unknown.","Docs, pricing, API, and README pages all returned only 'Connect wallet' with no substantive content.","The endpoint's actual functionality (what 'product 81 inventory' represents) is unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/81/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/81/inventory","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge confirms the endpoint is live and pricing is clear ($0.02 USDC on Base). However, there is no documentation for this specific endpoint's request/response schema, no OpenAPI spec, and the crawled docs/pricing/API pages returned only 'Connect wallet' with no useful content. The endpoint path (/products/81/inventory) is not listed on the landing page, making its purpose largely 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'0.02':72,115 '000':77 '0x8335':65 '20':76 '2913':66 '402 payment API' '6':81 '81':42 'Base network API' 'USDC pay-per-call API' 'accept':49,191 'access':34,129 'advertis':120 'ai':104 'analyt':103 'api':100,122 'attach':132 'base':8,22,60,78 'base-network' 'broader':89 'call':12,26 'caller':130 'challeng':184 'confirm':185 'contract':64 'cost':70 'data':102,206 'decim':82 'document':154,200 'endpoint':6,20,30,84,146,161,187 'exact':205 'exampl':202 'expect':174 'explicit':165 'field':176 'financ':107 'format':179 'function':142 'gate':3,17,99,194 'header':136 'id':41 'infrastructur':110 'input':175 'instant':128 'inventori':5,19,38,148 'json':54 'json-response' 'key':123 'land':156 'learn':106 'limit':126 'list':158,166 'live':189 'lookup':149 'lowpaymentfee inventory' 'lowpaymentfee.com':32,91 'machin':105 'mani':159 'maximum':69 'network':61 'no-api-key' 'offer':93 'page':157 'part':86 'particular':145 'pay':10,24 'pay-per-cal':9,23 'pay-per-call' 'payment':46,55,135,193 'payment-g':192 'per':11,25,74,116 'platform':90,119 'post':50,195 'price':113 'product':4,18,37,40,147 'product inventory API' 'product stock check' 'product-inventory' 'protocol':47 'provid':33 'rate':125 'remain':208 'request':51,75,117,139,172,196 'resourc':39 'respons':178,203 'return':53,207 'rout':169 'schema':173 'settl':57 'simpli':131 'span':101 'specif':141 'unclear':209 'unit':79 'unknown':181 'usdc':14,28,63,73 'usdc-settlement' 'use':62 'util':111 'varieti':95 'via':43 'web3':108 'well':153 'well-docu':152 'without':198 'x402':2,16,45,98,134,183 'x402 inventory endpoint' 'x402-gated':1,15,97 'x402-payment'","prices":[{"id":"cb95aa4f-9322-4c44-93dd-2eea47a849d4","listingId":"1c146b35-79ed-4759-ab69-db89772bd183","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/81/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":"2026-04-18T18:34:35.331Z"}],"sources":[{"listingId":"1c146b35-79ed-4759-ab69-db89772bd183","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/81/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:35.331Z","lastSeenAt":"2026-04-22T19:30:34.117Z"}],"details":{"listingId":"1c146b35-79ed-4759-ab69-db89772bd183","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/81/inventory \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting USDC payment on Base network with maxAmountRequired of 20000 base units.","source_url":"https://lowpaymentfee.com/api/v1/products/81/inventory"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.","source_url":"https://lowpaymentfee.com/api/v1/products/81/inventory"},{"claim":"The platform advertises $0.02 per request, no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The landing page lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories but does not list this specific /products/81/inventory endpoint.","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying inventory status for a specific product via a micropayment-gated API call","Integrating pay-per-use product data into an agent workflow without API key management","Programmatic inventory checks settled in USDC on Base L2"],"bestFor":["Agents or bots that need on-demand inventory data without subscription commitments","Developers experimenting with x402 payment-gated API patterns","Use cases requiring crypto-native per-call billing on Base"],"notFor":["High-volume inventory polling where per-call costs would accumulate quickly","Users who need detailed API documentation and guaranteed SLAs before integrating","Non-crypto workflows that cannot produce x402 payment headers"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:37:08.389Z"},"updatedAt":"2026-04-22T19:30:34.117Z"}}