{"id":"22c35417-450c-4c00-8036-d7d057357426","shortId":"2cex8u","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 \"Premium API Access\" resource at the path `/api/v1/products/8/inventory`. It is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all gated via the x402 payment protocol on the Base network.\n\nThe specific endpoint returns product inventory data (product ID 8) in JSON format. Payment is settled in USDC on Base (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) using the x402 \"exact\" scheme. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. The endpoint accepts HTTP POST requests and responds with `application/json`. No API keys or rate limits are advertised; access is granted purely through the x402 payment header.\n\nDocumentation on the site is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The endpoint is confirmed live (returns a proper 402 challenge), but the actual shape of the inventory response and any required POST body fields are unknown.","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","inventory check","stock availability","x402 API","USDC micropayment API","lowpaymentfee","pay-per-call inventory"],"warnings":["No OpenAPI spec or request/response schema available","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no content","The actual response payload structure is completely unknown","The endpoint name 'Premium API Access' is generic and does not describe the data returned","Cannot verify what 'products/8/inventory' actually returns without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/8/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/8/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 with a valid x402 402 challenge, and pricing is clear ($0.02 USDC per call). However, there is no documentation of request parameters, response schema, or usage examples. The docs/pricing/API pages are empty beyond a wallet-connect prompt. The purpose ('Premium API Access' for product 8 inventory) is vague and 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'0.02':129 '000':120 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':106 '20':119 '402':205 '6':125 '8':94 'USDC micropayment API' 'accept':133 'access':34,39,149 'actual':209 'advertis':148 'ai':66 'amount':114 'analyt':65 'api':38,62,142,168 'application/json':140 'avail':196 'base':8,22,83,104,121 'base-network' 'bodi':219 'broader':50 'call':12,26,117 'challeng':206 'confirm':200 'connect':176 'content':182 'contract':105 'data':64,91 'decim':126 'doc':166 'document':158,191 'endpoint':6,20,30,87,132,198 'equal':128 'exact':110 'exampl':195 'extrem':163 'field':220 'financ':69 'format':97 'gate':3,17,75 'grant':151 'header':157 'http':134 'id':93 'infrastructur':72 'inventori':5,19,90,213 'inventory check' 'json':96 'json-response' 'key':143 'learn':68 'limit':146 'live':201 'lowpaymentfee' 'lowpaymentfee.com':32,52 'machin':67 'maximum':113 'network':84 'no-api-key' 'offer':54 'openapi':186 'page':171 'part':47 'path':43 'pay':10,24,59 'pay-per-cal':9,23 'pay-per-call inventory' 'pay-per-request':58 'payment':79,98,156 'per':11,25,60,116 'platform':51 'post':135,218 'premium':37 'price':167 'product':4,18,89,92 'product inventory API' 'product-inventory' 'prompt':178 'proper':204 'protocol':80 'provid':33 'pure':152 'rate':145 'readm':170 'render':173 'request':61,136 'request/response':189 'requir':115,217 'resourc':40 'respond':138 'respons':214 'return':88,202 'schema':190 'scheme':111 'settl':100 'shape':210 'site':161 'span':63 'spars':164 'spec':187 'specif':86 'stock availability' 'unit':122 'unknown':222 'usag':194 'usd':130 'usdc':14,28,102,124 'usdc-settlement' 'use':107 'util':73 'varieti':56 'via':76 'wallet':177 'web3':70 'x402':2,16,78,109,155 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"e7a7261f-8143-43fc-a447-6e9116b43355","listingId":"22c35417-450c-4c00-8036-d7d057357426","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/8/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":"2026-04-18T18:35:55.576Z"}],"sources":[{"listingId":"22c35417-450c-4c00-8036-d7d057357426","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/8/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:55.576Z","lastSeenAt":"2026-04-22T18:30:48.728Z"}],"details":{"listingId":"22c35417-450c-4c00-8036-d7d057357426","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/8/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 402 challenge with x402Version 1, scheme 'exact', network 'base', maxAmountRequired 20000 USDC base units","source_url":"https://lowpaymentfee.com/api/v1/products/8/inventory"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/8/inventory"},{"claim":"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":"Documentation pages render only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying real-time inventory levels for a specific product","Automated stock-checking by purchasing agents","Integrating inventory data into e-commerce or supply-chain workflows"],"bestFor":["Agents needing on-demand inventory data without API key registration","Micropayment-based access to product stock information","x402-compatible clients on the Base network"],"notFor":["Bulk inventory queries across many products (only product 8 is documented at this path)","Users who need detailed API documentation or request/response schemas before integrating","Non-crypto users who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.304Z"},"updatedAt":"2026-04-22T18:30:48.728Z"}}