{"id":"752e11cd-cdd9-4d1d-b441-e9cb55665cb1","shortId":"7pbxTX","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 94) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 \"exact\" scheme. The maximum amount required per call is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals).\n\nThe hosting provider, lowpaymentfee.com, advertises a broad catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. However, this specific endpoint (/api/v1/products/94/inventory) is not listed on the provider's landing page among the advertised API categories. Its description is simply \"Premium API Access,\" and no further documentation, request schema, or response schema is available from the crawled pages (docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content).\n\nBecause there is no OpenAPI spec, no request/response examples, and no documentation beyond the x402 challenge itself, the actual data returned by this endpoint is unknown. It appears to be an inventory lookup for a specific product, but the fields, format, and semantics are unverified.","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 pay-per-call","Base network API","lowpaymentfee","product data API","inventory lookup"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown.","This specific endpoint (/api/v1/products/94/inventory) is not listed among the provider's advertised APIs.","All documentation pages (docs, pricing, README) returned only 'Connect wallet' with no content.","The purpose and data returned by this endpoint cannot be verified beyond the 'Premium API Access' label."],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/94/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/94/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 (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The specific endpoint is not even listed on the provider's own landing page. Effectively a stub 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'0.02':87,118 '000':80 '0x8335':65 '20':79 '2913':66 '6':90 '94':42 'Base network API' 'USDC pay-per-call' 'accept':49 'access':34,156 'actual':206 'advertis':96,147 'ai/ml':108 'among':145 'amount':74 'analyt':107 'api':104,123,148,155 'appear':215 'avail':167 'base':8,22,60,81 'base-network' 'behind':43 'beyond':200 'broad':98 'call':77 'catalog':99 'categori':149 'challeng':203 'commit':130 'connect':181 'content':187 'contract':64 'crawl':170 'crypto':111 'data':106,207 'decim':91 'descript':151 'doc':172 'document':160,199 'endpoint':6,20,30,48,134,211 'equal':86 'exact':70 'exampl':196 'field':227 'financ':110 'format':228 'gate':3,17,103 'host':93 'howev':131 'id':41 'infer':109 'inventori':5,19,38,219 'inventory lookup' 'json':54 'key':124 'land':143 'limit':127 'list':138 'lookup':220 'lowpaymentfee' 'lowpaymentfee.com':32,95 'maximum':73 'network':61 'no-api-key' 'openapi':192 'page':144,171,176 'pay':10,24 'pay-per-request':9,23 'payment':55 'paywal':46 'per':11,25,76,119 'post':50 'premium':154 'price':116,173 'product':4,18,37,40,224 'product data API' 'product inventory API' 'product-inventory' 'prompt':183 'provid':33,94,141 'rate':126 'readm':175 'request':12,26,51,120,161 'request/response':195 'requir':75 'resourc':39 'respons':164 'return':53,178,208 'schema':162,165 'scheme':71 'semant':230 'servic':114 'settl':57 'simpli':153 'span':105 'spec':193 'specif':133,223 'substant':186 'unit':82 'unknown':213 'unverifi':232 'usdc':14,28,63,84,88 'usdc-settlement' 'use':62,89 'util':113 'via':67 'wallet':182 'x402':2,16,45,69,102,202 'x402 inventory endpoint' 'x402-gated':1,15,101 'x402-payment'","prices":[{"id":"1edcf511-dd1f-4d32-b077-10a8682b1229","listingId":"752e11cd-cdd9-4d1d-b441-e9cb55665cb1","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/94/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":"2026-04-18T18:35:36.149Z"}],"sources":[{"listingId":"752e11cd-cdd9-4d1d-b441-e9cb55665cb1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/94/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:36.149Z","lastSeenAt":"2026-04-22T18:30:47.238Z"}],"details":{"listingId":"752e11cd-cdd9-4d1d-b441-e9cb55665cb1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/94/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 x402Version 1, requiring USDC payment on the Base network.","source_url":"https://lowpaymentfee.com/api/v1/products/94/inventory"},{"claim":"The provider advertises $0.02 per request with no API keys, no rate limits, and instant access.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.","source_url":"https://lowpaymentfee.com/api/v1/products/94/inventory"},{"claim":"maxAmountRequired is 20000 base units, which is $0.02 given USDC's 6 decimals.","source_url":"https://lowpaymentfee.com/api/v1/products/94/inventory"}],"useCases":["Querying inventory status for product ID 94 via a single paid API call","Integrating pay-per-request inventory checks into an agent workflow without API key management","Demonstrating x402 protocol payment flows on the Base network"],"bestFor":["Agents or services that need on-demand inventory data without subscription commitments","Developers experimenting with x402 protocol integrations on Base","Automated workflows requiring keyless, pay-as-you-go API access"],"notFor":["Use cases requiring documented request/response schemas before integration","High-volume inventory polling where per-request pricing may add up","Users who need detailed product catalog browsing (only product 94 is addressed by this endpoint)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.238Z"},"updatedAt":"2026-04-22T18:30:47.238Z"}}