{"id":"d75721c6-0b2e-4b11-afe5-c226b554657d","shortId":"dEWtB4","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 72) via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance, and utility services — all gated behind x402 micropayments settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/products/72/inventory` is described as \"Premium API Access\" and accepts POST requests. Payment is required per call: the x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (the asset at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base, which uses 6 decimals), equating to $0.02 per request. No API keys or rate limits are advertised; access is granted purely through the x402 payment header.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no further 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 HTTP 402 with a valid x402 challenge), but without documentation it is difficult to know what data is returned or what input is required beyond the payment header.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","product-inventory","http-post"],"categories":["commerce","data"],"synonyms":["product inventory API","x402 inventory endpoint","USDC micropayment API","Base network API","pay-per-call inventory","lowpaymentfee API","product data endpoint"],"warnings":["No API documentation available; docs, pricing, and README pages all render only a wallet-connect prompt","No request body schema or response schema documented — callers must guess at the expected input","The meaning of 'Premium API Access' and 'products/72/inventory' is unexplained; unclear what data is returned","No OpenAPI or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/72/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/72/inventory","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 challenge, but documentation is essentially nonexistent — no OpenAPI spec, no request/response schema, no description of what 'product 72 inventory' actually returns. The listing is effectively a stub with only pricing and protocol details 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'0.02':134 '000':117 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':125 '20':116 '402':209 '6':130 '72':42 'Base network API' 'USDC micropayment API' 'accept':101 'access':34,99,145 'actual':193 'advertis':112,144 'ai/ml':72 'analyt':71 'api':68,98,138,161 'asset':123 'base':8,22,88,118,127 'behind':80 'beyond':232 'bodi':200 'call':12,26,108 'challeng':111,214 'confirm':205 'connect':170 'contain':194 'content':176 'crawl':159 'data':70,192,224 'decim':131 'describ':95 'descript':187 'difficult':220 'doc':160 'document':154,217 'endpoint':6,20,30,53,92,203 'equat':132 'exampl':184 'expect':201 'extrem':156 'field':197 'financ':74 'gate':3,17,79 'grant':147 'header':153,235 'host':60 'http':208 'http-post' 'id':41 'infer':73 'input':229 'inventori':5,19,38,191 'key':139 'know':222 'limit':142 'live':206 'lowpaymentfee API' 'lowpaymentfee.com':32,57 'mani':52 'maxamountrequir':114 'micropay':82 'network':89 'offer':54 'one':50 'openapi':180 'page':165 'pay':10,24,65 'pay-per-cal':9,23 'pay-per-call inventory' 'pay-per-request':64 'payment':46,104,152,234 'per':11,25,66,107,135 'platform':58 'post':102,199 'premium':97 'price':162 'product':4,18,37,40 'product data endpoint' 'product inventory API' 'product-inventory' 'prompt':172 'protocol':47 'provid':33 'pure':148 'rate':141 'readm':164 'request':67,103,136 'request/response':183 'requir':106,231 'resourc':39 'return':167,207,226 'schema':181 'servic':77 'settl':83 'span':69 'spars':157 'specif':91 'unit':119 'usdc':14,28,85,121 'usdc-base' 'use':129 'util':76 'valid':212 'varieti':62 'via':43 'wallet':171 'without':216 'x402':2,16,45,81,110,151,213 'x402 inventory endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"d9f2b085-f409-4d21-a33e-e298c0c2c7d1","listingId":"d75721c6-0b2e-4b11-afe5-c226b554657d","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/72/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":"2026-04-18T18:37:20.320Z"}],"sources":[{"listingId":"d75721c6-0b2e-4b11-afe5-c226b554657d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/72/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:20.320Z","lastSeenAt":"2026-04-22T16:30:44.169Z"}],"details":{"listingId":"d75721c6-0b2e-4b11-afe5-c226b554657d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/72/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 HTTP 402 with a valid x402 challenge advertising USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/72/inventory"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/products/72/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":"Docs, API, pricing, and README pages return only a 'Connect wallet' prompt with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying inventory status for a specific product via micropayment","Integrating pay-per-call product data into an agent workflow","Accessing gated commercial data without API key registration"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Use cases requiring keyless, per-request API access","Developers exploring x402 protocol integrations"],"notFor":["Users needing detailed API documentation or schemas before integration","High-volume inventory queries where per-call pricing may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.24Z"},"updatedAt":"2026-04-22T16:30:44.169Z"}}