{"id":"1322ea39-f9eb-480b-8fc7-6a80251b22f2","shortId":"KC5kuS","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 product inventory resource (product ID 31) behind an x402 paywall. It is part of a broader platform offering dozens of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, infrastructure utilities, and more — all settled on the Base network using USDC.\n\nThe specific endpoint `/api/v1/products/31/inventory` is listed as \"Premium API Access\" and accepts HTTP POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header to each request.\n\nDocumentation is extremely sparse. The docs, pricing, API, 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 unclear what payload to send or what response structure to expect.","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","pay-per-call API","USDC API","Base network API","lowpaymentfee","micro-payment API"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request body or response format","Purpose and data returned by /api/v1/products/31/inventory is undocumented","The endpoint name 'Premium API Access' is generic and does not describe actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/31/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/31/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, confirming it works. However, there is no OpenAPI schema, no request/response examples, no documentation beyond a wallet-connect prompt, and the purpose of the 'Premium API Access' / product inventory endpoint is entirely opaque. Effectively a stub 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'0.02':115 '000':105 '0x8335':110 '20':104 '31':42 '402':199 '6':120 'Base network API' 'USDC API' 'accept':92 'access':34,90,133 'actual':182 'advertis':124 'ai/ml':65 'analyt':64 'api':61,89,126,151 'attach':136 'base':8,22,77,106,112 'base-network' 'behind':43 'bodi':189 'broader':52 'call':12,26 'caller':134 'challeng':98,200 'confirm':194 'connect':159 'contain':183 'content':165 'cost':102 'crypto':68 'data':63,181 'decim':121 'descript':176 'doc':149 'document':144,203 'dozen':55 'endpoint':6,20,30,83,192 'equal':114 'exampl':173 'expect':190,216 'extrem':146 'field':186 'financ':67 'gate':3,17 'header':140 'http':93 'id':41 'indic':99 'infer':66 'infrastructur':69 'instant':132 'inventori':5,19,38,180 'key':127 'limit':130 'list':86 'live':195 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':101 'micro-payment API' 'network':78 'no-api-key' 'offer':54 'openapi':169 'page':154 'part':49 'pay':10,24,58 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request':57 'payload':208 'payment':139 'paywal':46 'per':11,25,59,116 'platform':53,123 'post':94,188 'premium':88 'price':150 'product':4,18,37,40 'product inventory API' 'product-inventory' 'prompt':161 'proper':198 'provid':33 'rate':129 'readm':153 'render':156 'request':60,95,117,143 'request/response':172 'resourc':39 'respons':213 'return':196 'schema':170 'send':210 'settl':74 'simpli':135 'span':62 'spars':147 'specif':82 'structur':214 'substant':164 'unclear':206 'unit':107 'usdc':14,28,80,109,118 'usdc-settlement' 'use':79,119 'util':70 'wallet':160 'without':202 'x402':2,16,45,97,138 'x402 inventory' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"026b2319-a813-4193-a9b9-70375b93fab4","listingId":"1322ea39-f9eb-480b-8fc7-6a80251b22f2","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/31/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":"2026-04-18T18:38:33.985Z"}],"sources":[{"listingId":"1322ea39-f9eb-480b-8fc7-6a80251b22f2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/31/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:33.985Z","lastSeenAt":"2026-04-22T15:00:50.440Z"}],"details":{"listingId":"1322ea39-f9eb-480b-8fc7-6a80251b22f2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/31/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 of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/31/inventory"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/products/31/inventory"}],"useCases":["Querying product inventory data for product ID 31 via a single paid request","Integrating pay-per-call inventory checks into automated agent workflows","Demonstrating x402 protocol usage for micro-payment gated endpoints"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents needing on-demand inventory data without subscription commitments","Low-volume, pay-as-you-go API consumption"],"notFor":["Production use cases requiring documented request/response schemas","High-volume inventory queries where per-call pricing is inefficient","Users who need detailed API documentation before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.474Z"},"updatedAt":"2026-04-22T15:00:50.440Z"}}