{"id":"0feae220-6738-4abf-a68d-9569acffc036","shortId":"xrbMSL","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 89) 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, crypto, and utility services — all gated behind x402 micropayments settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/products/89/inventory` is labeled \"Premium API Access\" and accepts 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. Payment is made inline via the X-PAYMENT header per the x402 protocol.\n\nDocumentation on the site 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 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 data is returned or what input parameters are accepted.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","product-inventory","pay-per-request","no-api-key"],"categories":["commerce","data"],"synonyms":["product inventory API","x402 inventory endpoint","USDC micropayment API","Base network API","pay-per-call inventory","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content","No OpenAPI or request/response schema provided; input parameters and output format are unknown","The endpoint path references a specific product ID (89) but no explanation of what product this refers to","The generic title 'Premium API Access' does not describe the actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/89/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/89/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 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no documentation of request/response formats, and no examples. The docs pages are empty. The specific purpose of this 'products/89/inventory' endpoint is undocumented beyond the generic label 'Premium API 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'/request':136 '0.02':124,135 '000':113 '0x8335':118 '20':112 '2913':119 '402':226 '6':129 '89':42 'Base network API' 'USDC micropayment API' 'accept':101,245 'access':34,99 'across':138 'actual':209 'advertis':133 'ai/ml':72 'analyt':71 'api':68,98,144,177 'base':8,22,89,114,121 'base-network' 'behind':81 'bodi':216 'call':12,26 'challeng':106,227 'commit':152 'confirm':221 'connect':186 'contain':210 'content':192 'cost':110 'crypto':75 'data':70,208,237 'decim':130 'descript':203 'difficult':233 'doc':176 'document':168,230 'endpoint':6,20,30,53,93,141,219 'equal':123 'exampl':200 'expect':217 'extrem':173 'field':213 'financ':74 'gate':3,17,80 'header':163 'host':60 'id':41 'indic':107 'infer':73 'inlin':157 'input':242 'inventori':5,19,38,207 'key':145 'know':235 'label':96 'limit':148 'live':222 'lowpaymentfee' 'lowpaymentfee.com':32,57 'made':156 'mani':52 'maximum':109 'micropay':83 'minimum':151 'network':90 'no-api-key' 'offer':54 'one':50 'openapi':196 'page':181 'paramet':243 'pay':10,24,65 'pay-per-cal':9,23 'pay-per-call inventory' 'pay-per-request':64 'payment':46,154,162 'per':11,25,66,125,164 'platform':58,132 'post':102,215 'premium':97 'price':137,178 'product':4,18,37,40 'product inventory API' 'product-inventory' 'prompt':188 'proper':225 'protocol':47,167 'provid':33 'rate':147 'readm':180 'render':183 'request':67,103,126 'request/response':199 'requir':153 'resourc':39 'return':223,239 'schema':197 'servic':78 'settl':84 'site':171 'span':69 'spars':174 'specif':92 'substant':191 'uniform':134 'unit':115 'usdc':14,28,86,117,127 'usdc-settlement' 'use':128 'util':77 'varieti':62 'via':43,158 'wallet':187 'without':229 'x':161 'x-payment':160 'x402':2,16,45,82,105,166 'x402 inventory endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"d276e4d8-ea4a-4ca8-b39b-8bf19a9d0589","listingId":"0feae220-6738-4abf-a68d-9569acffc036","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/89/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":"2026-04-18T18:35:32.513Z"}],"sources":[{"listingId":"0feae220-6738-4abf-a68d-9569acffc036","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/89/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:32.513Z","lastSeenAt":"2026-04-22T18:03:23.131Z"}],"details":{"listingId":"0feae220-6738-4abf-a68d-9569acffc036","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/89/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/89/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/89/inventory"}],"useCases":["Querying product inventory data for product ID 89 via a single micropayment","Integrating pay-per-request inventory checks into automated agent workflows","Accessing inventory information without API key registration"],"bestFor":["Agents or services that need on-demand inventory data with no subscription","x402-compatible clients that can settle USDC on Base","Developers exploring x402 micropayment-gated APIs"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","High-volume inventory queries where per-request pricing may add up","Non-crypto users who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.382Z"},"updatedAt":"2026-04-22T18:03:23.131Z"}}