{"id":"08b4abb3-ce50-4baf-b2b8-d17b23b88402","shortId":"Zt7cD2","kind":"x402","title":"Pay-per-call product inventory endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call product inventory endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This x402-enabled endpoint at lowpaymentfee.com provides access to product inventory data (specifically product ID 1) via a POST request. Payment is handled inline using the x402 protocol on the Base network, settling in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD per request.\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that advertises multiple API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities — all priced at $0.02 per request. The platform emphasizes simplicity: no API keys, no rate limits, no commitments, and instant access. However, the specific endpoint being listed here (/api/v1/products/1/inventory) is not explicitly mentioned on the landing page's catalog, so its exact response schema and data content are unclear.\n\nThe probe confirms the endpoint is live, returning a proper 402 challenge with x402 version 1. The payment scheme is \"exact\" on the Base L2 network with a 300-second timeout. Documentation pages (/docs, /pricing, /api, /README) all returned only a \"Connect wallet\" prompt with no substantive content, so there is no detailed API documentation available for this specific endpoint.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","product-inventory","pay-per-call","no-api-key","post-method"],"categories":["commerce","data"],"synonyms":["product inventory API","inventory lookup","x402 inventory endpoint","USDC micropayment API","Base network API","pay-per-request inventory","lowpaymentfee"],"warnings":["No API documentation available — all doc pages return only a 'Connect wallet' prompt","This specific endpoint (/api/v1/products/1/inventory) is not listed in the provider's public API catalog","No request body schema or response schema documented anywhere","Unknown what 'product 1 inventory' actually returns — could be placeholder or demo data"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/1/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/1/inventory","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 via a valid 402 challenge, but there is no documentation, no request/response schema, and the specific endpoint (/products/1/inventory) is not listed on the provider's own landing page. All doc pages returned only 'Connect wallet' with no content. Pricing is clear but functionality is 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'/api/v1/products/1/inventory':147 '/docs':201 '/pricing':202 '/readme':204 '/request':17,34 '0.02':16,33,90,122 '000':81 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':72 '1':51,183 '20':80 '300':196 '402':178 '6':86 'Base network API' 'USDC micropayment API' 'access':43,139 'advertis':104 'ai':111 'amount':75 'analyt':110 'api':106,130,221 'avail':223 'base':9,26,66,82,191 'base-network' 'broader':100 'call':4,21,78 'catalog':157 'categori':107 'challeng':179 'commit':136 'confirm':170 'connect':209 'content':165,215 'contract':71 'data':47,109,164 'decim':87 'detail':220 'document':199,222 'emphas':127 'enabl':38 'endpoint':7,24,39,95,143,172,227 'equal':89 'exact':160,188 'explicit':150 'financ':114 'handl':58 'howev':140 'id':50 'includ':108 'infrastructur':117 'inlin':59 'instant':138 'inventori':6,23,46 'inventory lookup' 'key':131 'l2':192 'land':154 'learn':113 'limit':134 'list':145 'live':174 'lowpaymentfee' 'lowpaymentfee.com':41,102 'machin':112 'maximum':74 'mention':151 'multipl':105 'network':67,193 'no-api-key' 'page':155,200 'part':97 'pay':2,19 'pay-per-cal':1,18 'pay-per-call' 'pay-per-request inventory' 'payment':56,185 'per':3,20,77,92,123 'platform':101,126 'post':54 'post-method' 'price':120 'probe':169 'product':5,22,45,49 'product inventory API' 'product-inventory' 'prompt':211 'proper':177 'protocol':63 'provid':42 'rate':133 'request':55,93,124 'requir':76 'respons':161 'return':175,206 'schema':162 'scheme':186 'second':197 'settl':12,29,68 'simplic':128 'specif':48,142,226 'substant':214 'timeout':198 'unclear':167 'unit':83 'usd':91 'usdc':14,31,70,85 'usdc-settlement' 'use':60 'util':118 'version':182 'via':10,27,52 'wallet':210 'web3':115 'x402':11,28,37,62,181 'x402 inventory endpoint' 'x402-enabled':36 'x402-payment'","prices":[{"id":"aa7c0b53-615c-4c0d-8bf7-132c6e93d45f","listingId":"08b4abb3-ce50-4baf-b2b8-d17b23b88402","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/1/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":"2026-04-18T18:35:19.203Z"}],"sources":[{"listingId":"08b4abb3-ce50-4baf-b2b8-d17b23b88402","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/1/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:19.203Z","lastSeenAt":"2026-04-22T19:30:36.925Z"}],"details":{"listingId":"08b4abb3-ce50-4baf-b2b8-d17b23b88402","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/1/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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/1/inventory"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/products/1/inventory"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) contain only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying product inventory levels programmatically with per-call USDC payments","Integrating inventory checks into agent workflows without pre-registration or API keys","Building automated supply chain or e-commerce monitoring tools that pay per query"],"bestFor":["Agents needing on-demand inventory data without subscription commitments","Developers prototyping x402 payment flows on Base","Low-volume or sporadic inventory lookups at $0.02 per call"],"notFor":["High-volume inventory polling where per-call costs would accumulate significantly","Use cases requiring detailed API documentation or guaranteed SLAs","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:51.04Z"},"updatedAt":"2026-04-22T19:30:36.925Z"}}