{"id":"759138cb-e66d-4dac-bed3-233981bfdf2c","shortId":"CAy95Z","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 61) via the x402 payment protocol. It is part of a broader platform that offers a variety of pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated behind x402 micropayments on the Base network using USDC.\n\nThe specific endpoint `/api/v1/products/61/inventory` is described by the provider as \"Premium API Access.\" The x402 challenge confirms it accepts POST requests, settles on Base in USDC (contract 0x8335…2913), and charges a maximum of 20,000 base units per call. Since USDC uses 6 decimals, this equates to $0.02 per request, consistent with the platform's uniform $0.02/request pricing across all listed endpoints. No API keys or rate limits are advertised; access is granted purely via the x402 payment header.\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 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","micropayment API","USDC pay-per-call","lowpaymentfee","Base network API","product data endpoint"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet' with no content.","No request body schema or response schema documented; callers must guess at the expected input and output.","The specific meaning of 'products/61/inventory' is unknown — no description of what inventory data is returned.","No OpenAPI spec or ai-plugin manifest found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/61/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/61/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 examples, and the product inventory purpose is entirely opaque. Docs pages are empty stubs. This is effectively a stub 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'/request':144 '0.02':134,143 '000':121 '0x8335':113 '20':120 '2913':114 '402':222 '6':129 '61':42 'Base network API' 'USDC pay-per-call' 'accept':104,241 'access':34,98,158 'across':146 'actual':205 'advertis':157 'ai/ml':68 'analyt':67 'api':64,97,151,173 'base':8,22,82,109,122 'base-network' 'behind':77 'bodi':212 'broader':53 'call':63,125 'challeng':101,223 'charg':116 'confirm':102,217 'connect':182 'consist':137 'contain':206 'content':188 'contract':112 'crypto':71 'data':66,204,233 'decim':130 'describ':91 'descript':199 'difficult':229 'doc':172 'document':167,226 'endpoint':6,20,30,88,149,215 'equat':132 'exampl':196 'expect':213 'extrem':169 'field':209 'financ':70 'gate':3,17,76 'grant':160 'header':166 'id':41 'infer':69 'input':238 'inventori':5,19,38,203 'key':152 'know':231 'limit':155 'list':148 'live':218 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':118 'micropay':79 'micropayment API' 'network':83 'no-api-key' 'offer':56 'openapi':192 'page':177 'paramet':239 'part':50 'pay':10,24,61 'pay-per-cal':60 'pay-per-request':9,23 'payment':46,165 'per':11,25,62,124,135 'platform':54,140 'post':105,211 'premium':96 'price':145,174 'product':4,18,37,40 'product data endpoint' 'product inventory API' 'product-inventory' 'prompt':184 'proper':221 'protocol':47 'provid':33,94 'pure':161 'rate':154 'readm':176 'render':179 'request':12,26,106,136 'request/response':195 'resourc':39 'return':219,235 'schema':193 'servic':74 'settl':107 'sinc':126 'span':65 'spars':170 'specif':87 'substant':187 'uniform':142 'unit':123 'usdc':14,28,85,111,127 'usdc-settlement' 'use':84,128 'util':73 'varieti':58 'via':43,162 'wallet':183 'without':225 'x402':2,16,45,78,100,164 'x402 inventory endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"c6e43e7f-c7f5-4dff-bd76-f21614d75fdc","listingId":"759138cb-e66d-4dac-bed3-233981bfdf2c","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/61/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":"2026-04-18T18:35:51.209Z"}],"sources":[{"listingId":"759138cb-e66d-4dac-bed3-233981bfdf2c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/61/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:51.209Z","lastSeenAt":"2026-04-22T18:30:48.358Z"}],"details":{"listingId":"759138cb-e66d-4dac-bed3-233981bfdf2c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/61/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 maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/61/inventory"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/61/inventory"},{"claim":"Platform advertises $0.02/request uniform pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying inventory status for a specific product via micropayment","Integrating pay-per-call product data into agent workflows","Accessing product inventory without API key registration"],"bestFor":["Agents that need on-demand product inventory data with no subscription","Developers experimenting with x402 micropayment-gated APIs","Scenarios requiring keyless, pay-as-you-go API access on Base"],"notFor":["Users who need detailed API documentation or schema before integrating","High-volume inventory queries where per-call pricing may add up","Anyone needing guaranteed SLA or support — no docs or contact info available"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.487Z"},"updatedAt":"2026-04-22T18:30:48.358Z"}}