{"id":"148cf941-e04f-4b56-809a-d15a4640bb37","shortId":"c5uEqZ","kind":"x402","title":"x402-gated product inventory endpoint on Base, paid per-request in USDC.","tagline":"x402-gated product inventory endpoint on Base, paid per-request in USDC.","description":"This endpoint at lowpaymentfee.com provides access to a product inventory resource (product ID 90) via the x402 payment protocol. It is part of a broader platform that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated behind x402 micropayments settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/products/90/inventory` is listed as \"Premium API Access\" and accepts HTTP POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform advertises uniform $0.02/request pricing across all its endpoints, with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the inventory data actually contains or what fields the POST body expects. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is difficult to know what payload to send or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","product-inventory","pay-per-request","no-api-key"],"categories":["commerce","data"],"synonyms":["product inventory API","x402 inventory endpoint","USDC micropayment API","lowpaymentfee","pay-per-call inventory","Base network API","crypto-paid API"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content","No OpenAPI or request/response schema provided; request body format and response structure are unknown","The endpoint name 'Premium API Access' is generic and does not describe what data is returned","Product ID 90 is hardcoded in the URL with no explanation of what product it refers to"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/90/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/90/inventory","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, confirming pricing and payment details. However, there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of the 'Premium API Access' / product inventory endpoint is entirely opaque. This is effectively a stub 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'/request':134 '0.02':122,133 '000':111 '0x8335':116 '20':110 '2913':117 '402':207 '6':127 '90':42 'Base network API' 'USDC micropayment API' 'accept':98 'access':34,96 'across':136 'actual':190 'advertis':131 'ai/ml':68 'analyt':67 'api':63,95,142,159 'base':8,22,85,112,119 'base-network' 'behind':77 'bodi':197 'broader':53 'call':62 'challeng':104,208 'commit':150 'confirm':202 'connect':167 'contain':191 'content':173 'cost':108 'crypto':71 'crypto-paid API' 'data':66,189 'decim':128 'descript':184 'difficult':214 'doc':157 'document':152,211 'dozen':57 'endpoint':6,20,30,64,89,139,200 'equal':121 'exampl':181 'expect':198,225 'extrem':154 'field':194 'financ':70 'gate':3,17,76 'http':99 'id':41 'indic':105 'infer':69 'inventori':5,19,38,188 'key':143 'know':216 'limit':146 'list':92 'live':203 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':107 'micropay':79 'minimum':149 'network':86 'no-api-key' 'offer':56 'openapi':177 'page':162 'paid':9,23 'part':50 'pay':60 'pay-per-cal':59 'pay-per-call inventory' 'pay-per-request' 'payload':218 'payment':46 'per':11,25,61,123 'per-request':10,24 'platform':54,130 'post':100,196 'premium':94 'price':135,158 'product':4,18,37,40 'product inventory API' 'product-inventory' 'prompt':169 'proper':206 'protocol':47 'provid':33 'rate':145 'readm':161 'render':164 'request':12,26,101,124 'request/response':180 'requir':151 'resourc':39 'respons':223 'return':204 'schema':178 'send':220 'servic':74 'settl':80 'span':65 'spars':155 'specif':88 'substant':172 'uniform':132 'unit':113 'usdc':14,28,82,115,125 'usdc-micropayment' 'use':126 'util':73 'via':43 'wallet':168 'without':210 'x402':2,16,45,78,103 'x402 inventory endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"b6b47062-a762-4f90-be88-eff2064213dc","listingId":"148cf941-e04f-4b56-809a-d15a4640bb37","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/90/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":"2026-04-18T18:34:13.722Z"}],"sources":[{"listingId":"148cf941-e04f-4b56-809a-d15a4640bb37","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/90/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:13.722Z","lastSeenAt":"2026-04-22T21:30:23.676Z"}],"details":{"listingId":"148cf941-e04f-4b56-809a-d15a4640bb37","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/90/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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/90/inventory"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/90/inventory"}],"useCases":["Querying product inventory data for product ID 90 via a single micropayment","Integrating pay-per-request inventory checks into an agent workflow without API key management","Programmatic inventory lookups settled on-chain via USDC on Base"],"bestFor":["Agents or apps that need on-demand inventory data without subscription commitments","Developers experimenting with x402 micropayment-gated APIs","Workflows requiring keyless, per-call API access on Base"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume inventory polling where $0.02/request adds up quickly","Anyone needing non-USDC or non-Base payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:37:51.114Z"},"updatedAt":"2026-04-22T21:30:23.676Z"}}