{"id":"16cabea2-3afc-428e-a735-31e7a79f0311","shortId":"z5dT4y","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 47) via the x402 payment protocol. It is part of a broader platform offering dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, infrastructure utilities, and more — all gated behind x402 micropayments on the Base network using USDC.\n\nThe specific endpoint `/api/v1/products/47/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, 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 description of what the inventory response actually contains. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what fields the POST body should contain or what the response payload looks like.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","product-inventory","pay-per-request","no-api-key","post-method"],"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 pages render only 'Connect wallet' with no content","No OpenAPI or schema describing request body or response format","The endpoint is labeled 'Premium API Access' which is generic and uninformative about what data it actually returns","Cannot confirm what POST body fields are expected or what the inventory response contains"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/47/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/47/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, and all documentation pages render only a wallet-connect prompt. The actual purpose of the 'Premium API Access' / product inventory endpoint is unclear beyond its URL path. This is effectively a stub 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'0.02':123 '000':118 '0x8335':110 '20':117 '2913':111 '402':200 '47':42 '6':128 'Base network API' 'USDC pay-per-call' 'accept':96 'access':34,94,141 'actual':190 'advertis':132 'ai/ml':66 'amount':115 'analyt':65 'api':62,93,134,158 'attach':144 'base':8,22,81,106,119 'base-network' 'behind':76 'bodi':212 'broader':53 'call':61,151 'chain':104 'challeng':201 'confirm':195 'connect':167 'contain':191,214 'content':173 'contract':109 'crypto':69 'data':64 'decim':129 'descript':184 'doc':157 'document':152,204 'dozen':56 'endpoint':6,20,30,87,193 'equal':122 'exampl':181 'extrem':154 'field':209 'financ':68 'gate':3,17,75 'header':148 'id':41 'infer':67 'infrastructur':70 'instant':140 'inventori':5,19,38,188 'inventory lookup' 'key':135 'like':221 'limit':138 'list':90 'live':196 'look':220 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':114 'micropay':78 'network':82 'no-api-key' 'offer':55 'on-chain':102 'openapi':177 'page':162 'part':50 'pay':10,24,59 'pay-per-cal':58 'pay-per-request':9,23 'payload':219 'payment':46,99,147 'per':11,25,60,124 'platform':54,131 'post':97,211 'post-method' 'premium':92 'price':159 'product':4,18,37,40 'product data endpoint' 'product inventory API' 'product-inventory' 'prompt':169 'proper':199 'protocol':47 'provid':33 'rate':137 'readm':161 'render':164 'request':12,26,98,125 'request/response':180 'resourc':39 'respons':189,218 'return':197 'schema':178 'settl':101 'simpli':143 'span':63 'spars':155 'specif':86 'substant':172 'unclear':207 'unit':120 'usdc':14,28,84,108,126 'usdc-settlement' 'use':83,107,127 'util':71 'via':43 'wallet':168 'without':203 'x402':2,16,45,77,146 'x402 micropayment API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"dd82277f-1a46-4851-98ef-b80f8d362af8","listingId":"16cabea2-3afc-428e-a735-31e7a79f0311","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/47/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":"2026-04-18T18:34:42.457Z"}],"sources":[{"listingId":"16cabea2-3afc-428e-a735-31e7a79f0311","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/47/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:42.457Z","lastSeenAt":"2026-04-22T20:00:28.557Z"}],"details":{"listingId":"16cabea2-3afc-428e-a735-31e7a79f0311","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/47/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 valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/47/inventory"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/47/inventory"}],"useCases":["Querying inventory status for a specific product via micropayment","Integrating pay-per-call inventory checks into an agent workflow","Accessing product data without API key registration"],"bestFor":["Agents that can settle x402 payments on Base with USDC","Quick one-off inventory lookups without subscription commitments","Developers exploring x402 protocol integrations"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume inventory queries where per-call pricing may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:35:52.845Z"},"updatedAt":"2026-04-22T20:00:28.557Z"}}