{"id":"6cbb17e7-47cb-41f6-9f08-b8f3552fef06","shortId":"Z5nNSF","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/16/inventory`. It is part of a broader platform (lowpaymentfee.com) that offers a variety of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all settled on the Base network using USDC.\n\nThe specific endpoint probed here returns an x402 challenge requesting payment of up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the site's advertised flat pricing of $0.02/request across all endpoints. Payment is made via the x402 exact scheme, with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\n\nThe platform advertises no API keys, no rate limits, and instant access. However, documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all resolve to a minimal \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint title \"Premium API Access\" and path segment `products/16/inventory` suggest it returns inventory data for a specific product, but the exact request body format and response structure are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","product-inventory","json-api"],"categories":["commerce","data"],"synonyms":["product inventory API","x402 API","USDC micropayment API","lowpaymentfee","pay-per-call API","Base network API","inventory lookup"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README all return only a 'Connect wallet' prompt","No request body schema or response schema documented; callers must guess the payload format","The endpoint path 'products/16/inventory' is opaque — it is unclear what product 16 refers to or what inventory data is returned","No OpenAPI or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/16/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/16/inventory","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the purpose of 'products/16/inventory' is only inferable from the URL path. This is effectively a stub 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'/api/v1/products/16/inventory':44 '/docs':169 '/pricing':170 '/readme':172 '/request':129 '0.02':116,128 '000':99 '0x8335':104 '20':98 '2913':105 '300':143 '6':111 'Base network API' 'USDC micropayment API' 'accept':148 'access':34,39,165,204 'across':130 'advertis':124,156 'ai/ml':69 'analyt':68 'api':38,65,158,203 'application/json':153 'avail':198 'base':8,22,80,100,107 'base-network' 'bodi':222 'broader':50 'call':12,26 'challeng':92 'connect':178 'consist':119 'content':184 'data':67,72,213 'decim':112 'document':167,193 'endpoint':6,20,30,86,132,147,200 'exact':139,220 'exampl':196 'finance/web3':71 'flat':125 'format':223 'gate':3,17 'howev':166 'infer':70 'infrastructur':74 'instant':164 'inventori':5,19,212 'inventory lookup' 'json-api' 'key':159 'limit':162 'lowpaymentfee' 'lowpaymentfee.com':32,52 'made':135 'minim':177 'network':81 'offer':54 'openapi':188 'page':168 'part':47 'path':43,206 'pay':10,24,62 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request':61 'payload':197 'payment':94,133 'per':11,25,63,117 'platform':51,155 'post':149 'premium':37,202 'price':126 'probe':87 'product':4,18,217 'product inventory API' 'product-inventory' 'products/16/inventory':208 'prompt':180 'protocol':60 'provid':33 'rate':161 'request':64,93,118,150,221 'request/response':191 'resolv':174 'resourc':40 'respons':225 'return':89,152,211 'schema':192 'scheme':140 'second':144 'segment':207 'settl':77 'sinc':108 'site':122 'span':66 'spec':189 'specif':85,216 'structur':226 'substant':183 'suggest':209 'timeout':145 'titl':201 'translat':114 'unit':101 'unknown':228 'usdc':14,28,83,103,109 'usdc-settlement' 'use':82,110 'util':75 'varieti':56 'via':136 'wallet':179 'x402':2,16,59,91,138 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':58","prices":[{"id":"74c2bd39-da46-42ff-bbde-7501f437ea65","listingId":"6cbb17e7-47cb-41f6-9f08-b8f3552fef06","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/16/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":"2026-04-18T18:37:51.843Z"}],"sources":[{"listingId":"6cbb17e7-47cb-41f6-9f08-b8f3552fef06","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/16/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:51.843Z","lastSeenAt":"2026-04-22T16:30:46.612Z"}],"details":{"listingId":"6cbb17e7-47cb-41f6-9f08-b8f3552fef06","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/16/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 an x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/16/inventory"},{"claim":"The platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/16/inventory"}],"useCases":["Querying product inventory data with per-request USDC micropayments","Integrating pay-as-you-go inventory checks into agent workflows","Accessing gated commercial data without API keys or subscriptions"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Use cases requiring keyless, on-demand API access","Low-volume or sporadic inventory queries where subscription pricing is wasteful"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume use cases where per-request pricing at $0.02 adds up significantly","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.694Z"},"updatedAt":"2026-04-22T16:30:46.612Z"}}