{"id":"c796d2df-0a71-4c21-86df-73617115030a","shortId":"QzFFrs","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/7/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, crypto, and utility services — all settled on the Base network using USDC.\n\nThe specific endpoint `/api/v1/products/7/inventory` accepts POST requests and returns JSON. Based on the x402 challenge, each call costs up to 20,000 base units of USDC (0.02 USD) on Base. The platform advertises a flat $0.02 per request across its API catalog, with no API keys, no rate limits, and no minimum commitments required. Payment is handled entirely via the x402 protocol's `X-PAYMENT` header.\n\nDocumentation beyond the landing page 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 detailed description of what the inventory resource actually returns. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation makes it difficult to know what data to send or expect back.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","post-method","product-inventory"],"categories":["commerce","data"],"synonyms":["product inventory API","x402 API","USDC micropayment API","pay-per-call API","lowpaymentfee","Base network API","inventory lookup"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown.","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content.","The specific purpose and data returned by /api/v1/products/7/inventory is not described anywhere.","The endpoint path suggests a specific product (ID 7) but no context is given about what products are offered."],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/7/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/7/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 no documentation, no OpenAPI schema, no request/response examples, and the purpose of the 'products/7/inventory' resource is entirely opaque. Effectively a stub 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'0.02':110,119 '000':105 '20':104 '402':204 'Base network API' 'USDC micropayment API' 'accept':88 'access':34,39 'across':122 'actual':194 'advertis':116 'ai/ml':69 'analyt':68 'api':38,65,124,128,161 'back':222 'base':8,22,80,94,106,113 'base-network' 'beyond':152 'broader':50 'call':12,26,100 'catalog':125 'challeng':98,205 'commit':136 'confirm':199 'connect':170 'content':176 'cost':101 'crypto':72 'data':67,217 'descript':188 'detail':187 'difficult':213 'doc':160 'document':151,210 'endpoint':6,20,30,86,197 'entir':141 'exampl':184 'expect':221 'extrem':157 'financ':71 'flat':118 'gate':3,17 'handl':140 'header':150 'infer':70 'inventori':5,19,192 'inventory lookup' 'json':93 'json-response' 'key':129 'know':215 'lack':208 'land':154 'limit':132 'live':200 'lowpaymentfee' 'lowpaymentfee.com':32,52 'make':211 'minimum':135 'network':81 'offer':54 'openapi':180 'page':155,165 'part':47 'path':43 'pay':10,24,62 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request':61 'payment':138,149 'per':11,25,63,120 'platform':51,115 'post':89 'post-method' 'premium':37 'price':162 'product':4,18 'product inventory API' 'product-inventory' 'prompt':172 'proper':203 'protocol':60,145 'provid':33 'rate':131 'readm':164 'render':167 'request':64,90,121 'request/response':183 'requir':137 'resourc':40,193 'return':92,195,201 'schema':181 'send':219 'servic':75 'settl':77 'span':66 'spars':158 'specif':85 'substant':175 'unit':107 'usd':111 'usdc':14,28,83,109 'usdc-settlement' 'use':82 'util':74 'varieti':56 'via':142 'wallet':171 'x':148 'x-payment':147 'x402':2,16,59,97,144 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':58","prices":[{"id":"e25b45ce-e6ba-4266-9f34-bbcdef959373","listingId":"c796d2df-0a71-4c21-86df-73617115030a","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/7/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":"2026-04-18T18:34:17.926Z"}],"sources":[{"listingId":"c796d2df-0a71-4c21-86df-73617115030a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/7/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:17.926Z","lastSeenAt":"2026-04-22T21:30:23.850Z"}],"details":{"listingId":"c796d2df-0a71-4c21-86df-73617115030a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/7/inventory \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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 of USDC on Base network.","source_url":"https://lowpaymentfee.com/api/v1/products/7/inventory"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/products/7/inventory"}],"useCases":["Querying product inventory data via a single paid API call","Integrating pay-per-request inventory checks into agent workflows","Accessing premium data without API key registration"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Use cases requiring keyless, per-call API access","Developers exploring x402 protocol integrations"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-call pricing may add up without bulk discounts","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:37:18.385Z"},"updatedAt":"2026-04-22T21:30:23.850Z"}}