{"id":"b42afbc6-e231-4475-bfd1-83f2e4bcb304","shortId":"bKCeec","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 40) via the x402 payment protocol. It is part of a broader platform that offers dozens of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated behind x402 micropayments on the Base network using USDC.\n\nThe specific endpoint `/api/v1/products/40/inventory` is listed as \"Premium API Access\" and accepts POST requests. Payment is settled on-chain on Base using USDC (contract 0x8335…2913) with a maximum amount of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each call.\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 endpoint actually returns. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what request body is expected or what shape the response takes.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","product-inventory","pay-per-request","no-api-key"],"categories":["commerce","data"],"synonyms":["product inventory API","x402 micropayment API","USDC pay-per-call","lowpaymentfee","Base network API","inventory lookup","product data endpoint"],"warnings":["No documentation available — all doc/pricing/API/README pages render only 'Connect wallet'","No OpenAPI or request/response schema provided","The specific purpose and data returned by the /products/40/inventory endpoint is unknown","Cannot verify what data the endpoint actually returns without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/40/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/40/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, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the purpose of 'Premium API Access' for product 40 inventory is unexplained. The listing is effectively a 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'0.02':124 '000':119 '0x8335':111 '20':118 '2913':112 '40':42 '402':201 '6':129 'Base network API' 'USDC pay-per-call' 'accept':97 'access':34,95,142 'actual':191 'advertis':133 'ai/ml':68 'amount':116 'analyt':67 'api':63,94,135,160 'attach':145 'base':8,22,82,107,120 'base-network' 'behind':77 'bodi':211 'broader':53 'call':12,26,152 'chain':105 'challeng':202 'confirm':196 'connect':168 'content':174 'contract':110 'crypto':71 'data':66 'decim':130 'descript':185 'doc':158 'document':153,205 'dozen':57 'endpoint':6,20,30,64,88,190,194 'equal':123 'exampl':182 'expect':213 'extrem':155 'financ':70 'gate':3,17,76 'header':149 'id':41 'infer':69 'instant':141 'inventori':5,19,38,189 'inventory lookup' 'key':136 'limit':139 'list':91 'live':197 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':115 'micropay':79 'network':83 'no-api-key' 'offer':56 'on-chain':103 'openapi':178 'page':163 'part':50 'pay':10,24,60 'pay-per-cal':9,23 'pay-per-request':59 'payment':46,100,148 'per':11,25,61,125 'platform':54,132 'post':98 'premium':93 'price':159 'product':4,18,37,40 'product data endpoint' 'product inventory API' 'product-inventory' 'prompt':170 'proper':200 'protocol':47 'provid':33 'rate':138 'readm':162 'render':165 'request':62,99,126,210 'request/response':181 'resourc':39 'respons':218 'return':192,198 'schema':179 'servic':74 'settl':102 'shape':216 'simpli':144 'span':65 'spars':156 'specif':87 'substant':173 'take':219 'unclear':208 'unit':121 'usdc':14,28,85,109,127 'usdc-settlement' 'use':84,108,128 'util':73 'via':43 'wallet':169 'without':204 'x402':2,16,45,78,147 'x402 micropayment API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"8f060b7c-79b0-462a-a5e5-3a17681f7606","listingId":"b42afbc6-e231-4475-bfd1-83f2e4bcb304","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/40/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":"2026-04-18T18:34:24.491Z"}],"sources":[{"listingId":"b42afbc6-e231-4475-bfd1-83f2e4bcb304","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/40/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:24.491Z","lastSeenAt":"2026-04-22T20:00:27.837Z"}],"details":{"listingId":"b42afbc6-e231-4475-bfd1-83f2e4bcb304","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/40/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 x402Version 1, accepting USDC on Base with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/products/40/inventory"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/products/40/inventory"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages show only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying inventory status for a specific product via micropayment","Integrating pay-per-call product data into an agent workflow","Accessing product information without API key registration"],"bestFor":["Agents that can settle x402 payments on Base with USDC","Developers wanting zero-signup, pay-per-request product data","Micropayment-native workflows needing inventory checks"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integration","High-volume bulk inventory queries where per-call pricing is inefficient","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T18:01:33.632Z"},"updatedAt":"2026-04-22T20:00:27.837Z"}}