{"id":"13737260-f868-432c-bf73-c7dc6323cf0d","shortId":"3uJRcY","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 43) via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a broad catalog of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints on the platform use the x402 protocol to gate access, settling payments in USDC on the Base network.\n\nThe specific endpoint `/api/v1/products/43/inventory` is labeled \"Premium API Access\" in the x402 challenge. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. The endpoint accepts POST requests and returns application/json responses. No API keys or rate limits are advertised; access is granted purely via the x402 payment header.\n\nDocumentation is extremely sparse. The crawled docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the inventory data actually contains. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is difficult to know what request body to send or what shape the response takes.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","product-inventory","pay-per-request","no-api-key","json-response"],"categories":["commerce","data"],"synonyms":["product inventory API","x402 inventory endpoint","lowpaymentfee API","USDC pay-per-call","Base network API","product data endpoint","inventory lookup"],"warnings":["No API documentation available; all doc pages return only 'Connect wallet'","No OpenAPI or request/response schema provided","The specific data returned by this inventory endpoint is unknown","The label 'Premium API Access' is generic and does not describe the actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/43/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/43/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, but documentation is essentially nonexistent—every doc page just shows 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the purpose of 'Premium API Access' for product 43 inventory is unexplained. The listing is effectively a 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'0.02':130 '000':121 '20':120 '402':207 '43':42 '6':126 'Base network API' 'USDC pay-per-call' 'accept':134 'access':34,91,108,149 'actual':197 'advertis':148 'ai/ml':73 'amount':115 'analyt':72 'api':69,107,142,167 'application/json':139 'base':8,22,98,122 'base-network' 'bodi':219 'broad':62 'call':12,26,118 'catalog':63 'challeng':112,208 'confirm':202 'connect':173 'contain':198 'crawl':163 'crypto':76 'data':71,196 'decim':127 'descript':191 'detail':180 'difficult':214 'doc':164 'document':158,211 'endpoint':6,20,30,53,81,102,133,200 'equal':129 'exampl':188 'extrem':160 'financ':75 'gate':3,17,90 'grant':151 'header':157 'host':60 'id':41 'infer':74 'inventori':5,19,38,195 'inventory lookup' 'json-response' 'key':143 'know':216 'label':105 'limit':146 'live':203 'lowpaymentfee API' 'lowpaymentfee.com':32,57 'mani':52 'maximum':114 'network':99 'no-api-key' 'offer':54 'one':50 'openapi':184 'page':168 'pay':10,24,66 'pay-per-cal':9,23 'pay-per-request':65 'payment':46,93,156 'per':11,25,67,117 'platform':58,84 'post':135 'premium':106 'price':165 'product':4,18,37,40 'product data endpoint' 'product inventory API' 'product-inventory' 'prompt':175 'proper':206 'protocol':47,88 'provid':33 'pure':152 'rate':145 'request':68,136,218 'request/response':187 'requir':116 'resourc':39 'respons':140,226 'return':138,170,204 'schema':185 'send':221 'servic':79 'settl':92 'shape':224 'span':70 'spars':161 'specif':101 'take':227 'technic':179 'unit':123 'usd':131 'usdc':14,28,95,125 'usdc-settlement' 'use':85 'util':78 'via':43,153 'wallet':174 'without':210 'x402':2,16,45,87,111,155 'x402 inventory endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"0f6a0e5c-11fd-4698-bdf8-22ce71f256c3","listingId":"13737260-f868-432c-bf73-c7dc6323cf0d","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/43/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":"2026-04-18T18:35:22.207Z"}],"sources":[{"listingId":"13737260-f868-432c-bf73-c7dc6323cf0d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/43/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:22.207Z","lastSeenAt":"2026-04-22T18:30:45.959Z"}],"details":{"listingId":"13737260-f868-432c-bf73-c7dc6323cf0d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/43/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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/43/inventory"},{"claim":"The platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/43/inventory"}],"useCases":["Querying inventory status for a specific product via micropayment","Integrating pay-per-call product data into an agent workflow","Accessing product inventory without API key registration"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Use cases requiring keyless, pay-per-request product data access","Developers exploring x402 protocol integrations"],"notFor":["Users needing detailed API documentation or schemas before integrating","High-volume inventory queries where per-call pricing adds up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.898Z"},"updatedAt":"2026-04-22T18:30:45.959Z"}}