{"id":"a7246ca7-fb5d-4007-a100-238d398c2a13","shortId":"R7WE2Q","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 23) via the x402 payment protocol. It is part of a broader platform that offers dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated behind x402 micro-payments on the Base network using USDC.\n\nThe specific endpoint `/api/v1/products/23/inventory` accepts POST requests and returns JSON. 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 uniform $0.02/request pricing across all endpoints, no API keys, no rate limits, and instant access.\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 data actually contains or what fields the POST body expects. The endpoint is confirmed live (returns a valid 402 challenge), but without documentation it is unclear what payload to send or what shape the response takes.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","product-inventory","pay-per-request","no-api-key","json-response"],"categories":["commerce","data"],"synonyms":["product inventory API","inventory lookup","x402 inventory","micropayment API","USDC pay-per-call","lowpaymentfee","Base network API","product data endpoint"],"warnings":["No documentation available — all doc/API/pricing/README pages render only 'Connect wallet' with no content","No OpenAPI or input/output schema provided; request body format is unknown","The specific meaning of 'products/23/inventory' is undocumented — unclear what data is returned","No rate limit or SLA information available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/23/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/23/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 zero documentation on request format, response schema, or what 'product inventory' actually returns. Docs pages are empty wallet-connect stubs. Without any OpenAPI spec, examples, or meaningful description, this is effectively a stub 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'/request':128 '0.02':116,127 '000':106 '0x8335':111 '20':105 '23':42 '402':197 '6':121 'Base network API' 'USDC pay-per-call' 'accept':91 'access':34,141 'across':130 'actual':180 'advertis':125 'ai/ml':67 'analyt':66 'api':63,134,148 'base':8,22,83,107,113 'base-network' 'behind':76 'bodi':187 'broader':53 'call':62 'challeng':99,198 'confirm':192 'connect':157 'contain':181 'content':163 'cost':103 'crypto':70 'data':65,179 'decim':122 'descript':174 'doc':147 'document':142,201 'dozen':57 'endpoint':6,20,30,89,132,190 'equal':115 'exampl':171 'expect':188 'extrem':144 'field':184 'financ':69 'gate':3,17,75 'id':41 'indic':100 'infer':68 'instant':140 'inventori':5,19,38,178 'inventory lookup' 'json':96 'json-response' 'key':135 'limit':138 'live':193 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':102 'micro':79 'micro-pay':78 'micropayment API' 'network':84 'no-api-key' 'offer':56 'openapi':167 'page':152 'part':50 'pay':10,24,60 'pay-per-cal':59 'pay-per-request':9,23 'payload':206 'payment':46,80 'per':11,25,61,117 'platform':54,124 'post':92,186 'price':129,149 'product':4,18,37,40 'product data endpoint' 'product inventory API' 'product-inventory' 'prompt':159 'protocol':47 'provid':33 'rate':137 'readm':151 'render':154 'request':12,26,93,118 'request/response':170 'resourc':39 'respons':213 'return':95,194 'schema':168 'send':208 'servic':73 'shape':211 'span':64 'spars':145 'specif':88 'substant':162 'take':214 'unclear':204 'uniform':126 'unit':108 'usdc':14,28,86,110,119 'usdc-micropayment' 'use':85,120 'util':72 'valid':196 'via':43 'wallet':158 'without':200 'x402':2,16,45,77,98 'x402 inventory' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"bba460d6-1e92-4eed-a709-4a78a5126025","listingId":"a7246ca7-fb5d-4007-a100-238d398c2a13","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/23/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":"2026-04-18T18:36:33.727Z"}],"sources":[{"listingId":"a7246ca7-fb5d-4007-a100-238d398c2a13","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/23/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:33.727Z","lastSeenAt":"2026-04-22T16:30:41.019Z"}],"details":{"listingId":"a7246ca7-fb5d-4007-a100-238d398c2a13","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/23/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 of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/23/inventory"},{"claim":"Platform advertises $0.02/request pricing, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/products/23/inventory"}],"useCases":["Querying real-time inventory levels for a specific product","Integrating inventory checks into automated purchasing workflows","Agent-driven inventory monitoring with per-call USDC payments"],"bestFor":["Agents needing on-demand inventory data without subscription commitments","Developers experimenting with x402 micropayment-gated APIs","Low-volume inventory queries where pay-per-call is cost-effective"],"notFor":["High-volume inventory polling where per-request fees add up quickly","Use cases requiring detailed API documentation or guaranteed SLAs","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.455Z"},"updatedAt":"2026-04-22T16:30:41.019Z"}}