{"id":"078b44b3-a0ac-4722-b6af-d9bcc771e828","shortId":"VdyffK","kind":"x402","title":"x402-gated product inventory endpoint on Base, pay-per-request with USDC.","tagline":"x402-gated product inventory endpoint on Base, pay-per-request with USDC.","description":"This endpoint at lowpaymentfee.com provides access to a product inventory resource (product ID 75) via the x402 payment protocol. It is part of a broader platform that offers dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated behind x402 challenges on the Base network using USDC.\n\nThe specific endpoint `/api/v1/products/75/inventory` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises 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's landing page confirms uniform $0.02/request pricing across all endpoints, with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint name \"Premium API Access\" and path segment \"products/75/inventory\" suggest it returns inventory data for a specific product, but the exact request body format and response structure are unknown. The endpoint is confirmed live (returns a valid 402 challenge).","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","product-inventory","post-method"],"categories":["commerce","data"],"synonyms":["product inventory API","x402 inventory endpoint","pay-per-call inventory","lowpaymentfee API","USDC gated API","Base network API","product data endpoint"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","No request body schema or response schema documented; callers must guess the payload format","The endpoint path suggests a specific product (ID 75) but no context is given about what products are available or what 'inventory' returns","The generic title 'Premium API Access' does not describe the actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/75/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/75/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 with clear pricing, but there is zero documentation on request/response schemas, no OpenAPI spec, and the docs pages are empty. The purpose of this specific endpoint ('products/75/inventory') is vague — 'Premium API Access' is a generic label. Effectively a stub 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'/api/v1/products/75/inventory':88 '/docs':156 '/pricing':158 '/readme':160 '/request':134 '0.02':119,133 '000':108 '0x8335':113 '20':107 '2913':114 '402':225 '6':124 '75':42 'Base network API' 'USDC gated API' 'accept':96 'access':34,94,192 'across':136 'advertis':102 'ai/ml':67 'analyt':66 'api':63,93,141,191 'avail':186 'base':8,22,81,109,116 'base-network' 'behind':76 'bodi':210 'broader':53 'call':62 'challeng':78,101,226 'commit':149 'confirm':131,220 'connect':166 'content':172 'cost':105 'crypto':70 'data':65,201 'decim':125 'document':151,181 'dozen':57 'endpoint':6,20,30,87,138,188,218 'equal':118 'exact':208 'exampl':184 'extrem':153 'financ':69 'format':211 'gate':3,17,75 'id':41 'infer':68 'inventori':5,19,38,200 'key':142 'land':129 'limit':145 'list':90 'live':221 'lowpaymentfee API' 'lowpaymentfee.com':32 'maximum':104 'minimum':148 'name':189 'network':82 'offer':56 'openapi':176 'page':130,161 'part':50 'path':194 'pay':10,24,60 'pay-per-cal':59 'pay-per-call inventory' 'pay-per-request':9,23 'payload':185 'payment':46 'per':11,25,61,120 'platform':54,127 'post':97 'post-method' 'premium':92,190 'price':135 'product':4,18,37,40,205 'product data endpoint' 'product inventory API' 'product-inventory' 'products/75/inventory':196 'prompt':168 'protocol':47 'provid':33 'rate':144 'render':163 'request':12,26,98,121,209 'request/response':179 'requir':150 'resourc':39 'respons':213 'return':199,222 'schema':180 'segment':195 'servic':73 'span':64 'spars':154 'spec':177 'specif':86,204 'structur':214 'substant':171 'suggest':197 'uniform':132 'unit':110 'unknown':216 'usdc':14,28,84,112,122 'usdc-settlement' 'use':83,123 'util':72 'valid':224 'via':43 'wallet':167 'x402':2,16,45,77,100 'x402 inventory endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"448d4c2a-32cc-4744-8ca7-3ff21ae6797c","listingId":"078b44b3-a0ac-4722-b6af-d9bcc771e828","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/75/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":"2026-04-18T18:34:41.842Z"}],"sources":[{"listingId":"078b44b3-a0ac-4722-b6af-d9bcc771e828","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/75/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:41.842Z","lastSeenAt":"2026-04-22T19:30:34.513Z"}],"details":{"listingId":"078b44b3-a0ac-4722-b6af-d9bcc771e828","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/75/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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/75/inventory"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/75/inventory"}],"useCases":["Querying inventory levels for a specific product via a micropayment-gated API","Integrating pay-per-request product data into an agent workflow without API key management","Accessing product inventory data settled on Base L2 with USDC"],"bestFor":["Agents that need on-demand product inventory data without subscription overhead","Developers exploring x402 payment protocol integrations","Workflows requiring keyless, pay-as-you-go API access on Base"],"notFor":["High-volume inventory polling where per-request fees would accumulate significantly","Users who need detailed API documentation or guaranteed SLAs before integrating","Non-crypto workflows that cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:37:32.061Z"},"updatedAt":"2026-04-22T19:30:34.513Z"}}