{"id":"85ebb3d8-99a6-4326-9799-992149bc1a66","shortId":"Sh8PVB","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/36/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, and utility services — all settled on the Base network using USDC.\n\nThe specific endpoint returns product inventory data (product ID 36) in JSON format via HTTP POST. Payment is handled inline using the x402 protocol: callers attach an `X-PAYMENT` header with a signed USDC payment on Base. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD — consistent with the platform's advertised flat $0.02-per-request pricing. No API keys or rate limits are imposed; access is instant once payment is included.\n\nThe platform advertises additional endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. Documentation pages exist but appear gated behind a wallet connection, so detailed request/response schemas for this specific inventory endpoint are not publicly available.","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","x402 inventory endpoint","USDC pay-per-call API","lowpaymentfee API","Base network API","product stock check","inventory lookup"],"warnings":["No request or response schema available — the endpoint's exact input parameters and output format are unknown.","Documentation pages (/docs, /pricing, /api, /README) all appear to require wallet connection and returned no useful content.","The endpoint path suggests a specific product (ID 36) but no context is given about what product this refers to.","This specific endpoint path (/api/v1/products/36/inventory) does not appear in the platform's own listed API catalog, raising questions about its intended audience."],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/36/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/36/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, but there is no OpenAPI schema, no documented request/response format, and the docs pages are gated behind wallet connection. The specific purpose of 'products/36/inventory' is unclear beyond the generic 'Premium API Access' label. Effectively a stub 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'0.02':138,147,201 '000':129 '20':128 '36':92 '6':134 'Base network API' 'USDC pay-per-call API' 'access':34,39,160 'addit':170 'advertis':145,169 'ai/ml':69 'amount':123 'analysi':179 'analyt':68 'api':38,65,153 'appear':208 'attach':108 'avail':226 'base':8,22,79,120,130 'base-network' 'behind':210 'broader':50 'call':12,26,126 'caller':107 'classif':182 'connect':213 'consist':140 'convers':194 'data':67,89,175 'decim':135 'detail':215 'document':204 'embed':183 'endpoint':6,20,30,85,171,222 'equal':137 'estim':191 'exchang':186 'exist':206 'export':176 'feed':185 'financ':71 'flat':146 'format':95 'gas':190 'gate':3,17,209 'generat':196 'geocod':192 'handl':101 'header':113 'http':97 'id':91 'impos':159 'includ':166 'infer':70 'inlin':102 'insight':177 'instant':162 'inventori':5,19,88,221 'inventory lookup' 'json':94 'json-response' 'key':154 'limit':157 'lowpaymentfee API' 'lowpaymentfee.com':32,52 'maximum':122 'metric':173 'network':80 'no-api-key' 'offer':54 'page':205 'part':47 'path':43 'pay':10,24,62 'pay-per-cal':9,23 'pay-per-request':61 'payment':99,112,118,164 'per':11,25,63,125,149 'per-request':148 'platform':51,143,168 'point':203 'post':98 'premium':37 'price':151,184,202 'product':4,18,87,90 'product inventory API' 'product stock check' 'product-inventory' 'protocol':60,106 'provid':33 'public':225 'quot':189 'rate':156,187 'report':174 'request':64,150 'request/response':216 'requir':124 'resourc':40 'return':86 'schema':217 'sentiment':178 'servic':74 'settl':76 'sign':116 'span':66 'specif':84,220 'summar':181 'text':180 'token':188 'unit':131 'usd':139 'usdc':14,28,82,117,133 'usdc-settlement' 'use':81,103 'util':73 'valid':193 'varieti':56 'via':96 'wallet':212 'x':111 'x-payment':110 'x402':2,16,59,105 'x402 inventory endpoint' 'x402-gated':1,15 'x402-payment' 'x402-protocol':58","prices":[{"id":"cd6c9697-cdbc-4181-9133-305d99cceab5","listingId":"85ebb3d8-99a6-4326-9799-992149bc1a66","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/36/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":"2026-04-18T18:36:24.587Z"}],"sources":[{"listingId":"85ebb3d8-99a6-4326-9799-992149bc1a66","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/36/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:24.587Z","lastSeenAt":"2026-04-22T16:30:40.329Z"}],"details":{"listingId":"85ebb3d8-99a6-4326-9799-992149bc1a66","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/36/inventory \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns HTTP 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/36/inventory"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/products/36/inventory"},{"claim":"Platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists APIs across data/analytics, AI/ML, finance/web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying real-time inventory levels for a specific product","Integrating pay-per-call inventory checks into an automated purchasing agent","Building a storefront that verifies stock availability before checkout"],"bestFor":["Agents needing on-demand inventory data without subscription commitments","Developers experimenting with x402 micropayment-gated APIs","Low-volume callers who prefer pay-per-use over monthly plans"],"notFor":["High-volume inventory polling where $0.02/request adds up quickly","Users who need detailed API documentation before integrating (docs are sparse)","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.871Z"},"updatedAt":"2026-04-22T16:30:40.329Z"}}