{"id":"ebdae39b-30b4-414b-b4f7-039fa2198e18","shortId":"B7gwGx","kind":"x402","title":"Pay-per-call product inventory endpoint on Base via x402, settling in USDC at $0.02/request.","tagline":"Pay-per-call product inventory endpoint on Base via x402, settling in USDC at $0.02/request.","description":"This x402-enabled endpoint at lowpaymentfee.com provides access to product inventory data (specifically product ID 42) via a POST request. Payment is handled inline using the x402 protocol on the Base network, settling in USDC (contract 0x8335…2913). The advertised maximum cost per request is $0.02 (20,000 base units of USDC with 6 decimals).\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced uniformly at $0.02 per request. 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 detailed description of what the inventory endpoint returns. The endpoint itself is confirmed live (returns HTTP 402 with a valid x402 challenge), but the actual response payload structure is unknown. The specific endpoint path (/api/v1/products/42/inventory) does not appear in the site's listed API catalog, suggesting it may be a demo or unlisted resource.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","product-inventory","pay-per-call","no-api-key"],"categories":["commerce","data"],"synonyms":["product inventory API","x402 inventory endpoint","pay-per-request API","USDC micropayment API","Base network API","lowpaymentfee","product data endpoint"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All doc/pricing/API pages render only 'Connect wallet' with no substantive content","The endpoint path /api/v1/products/42/inventory does not appear in the site's published API catalog","No examples of successful responses are available to verify actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/42/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/42/inventory","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs. The specific endpoint path is not listed on the site's catalog, making its purpose 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'/request':17,34 '0.02':16,33,81,124 '000':83 '0x8335':72 '20':82 '2913':73 '402':197 '42':51 '6':89 'Base network API' 'USDC micropayment API' 'access':43,138 'actual':205 'advertis':75,129 'ai/ml':113 'analyt':112 'api':109,131,156,224 'appear':218 'attach':141 'base':9,26,66,84 'base-network' 'broader':97 'call':4,21,108 'caller':139 'catalog':225 'challeng':202 'confirm':193 'connect':164 'content':170 'contract':71 'cost':77 'data':47,111,116 'decim':90 'demo':231 'descript':182 'detail':181 'doc':154 'document':149 'enabl':38 'endpoint':7,24,39,92,187,190,213 'exampl':178 'extrem':151 'finance/web3':115 'handl':58 'header':145 'http':196 'id':50 'infer':114 'infrastructur':118 'inlin':59 'instant':137 'inventori':6,23,46,186 'key':132 'limit':135 'list':223 'live':194 'lowpaymentfee' 'lowpaymentfee.com':41,99 'maximum':76 'may':228 'network':67 'no-api-key' 'offer':101 'openapi':174 'page':159 'part':94 'path':214 'pay':2,19,106 'pay-per-cal':1,18,105 'pay-per-call' 'pay-per-request API' 'payload':207 'payment':56,144 'per':3,20,78,107,125 'platform':98,128 'post':54 'price':121,155 'product':5,22,45,49 'product data endpoint' 'product inventory API' 'product-inventory' 'prompt':166 'protocol':63 'provid':42 'rate':134 'readm':158 'render':161 'request':55,79,126,148 'request/response':177 'resourc':234 'respons':206 'return':188,195 'schema':175 'settl':12,29,68 'simpli':140 'site':221 'span':110 'spars':152 'specif':48,212 'structur':208 'substant':169 'suggest':226 'uniform':122 'unit':85 'unknown':210 'unlist':233 'usdc':14,31,70,87 'usdc-settlement' 'use':60 'util':119 'valid':200 'varieti':103 'via':10,27,52 'wallet':165 'x402':11,28,37,62,143,201 'x402 inventory endpoint' 'x402-enabled':36 'x402-payment'","prices":[{"id":"f634d5a7-a3e8-4804-b1b9-0b13b64f3ac2","listingId":"ebdae39b-30b4-414b-b4f7-039fa2198e18","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/42/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":"2026-04-18T18:35:18.008Z"}],"sources":[{"listingId":"ebdae39b-30b4-414b-b4f7-039fa2198e18","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/42/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:18.008Z","lastSeenAt":"2026-04-22T20:00:30.185Z"}],"details":{"listingId":"ebdae39b-30b4-414b-b4f7-039fa2198e18","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/42/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 HTTP 402 with x402 version 1 challenge requesting USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/42/inventory"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/products/42/inventory"},{"claim":"The 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 is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/products/42/inventory"},{"claim":"Documentation pages (docs, pricing, API, README) contain only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying real-time inventory levels for a specific product without needing an API key","Integrating pay-per-call inventory checks into an autonomous agent workflow","Demonstrating x402 protocol payment flows on Base with USDC"],"bestFor":["Agents or bots that need keyless, on-demand inventory data","Developers experimenting with x402 micropayment protocols","Low-volume callers who prefer pay-per-use over subscriptions"],"notFor":["High-volume inventory polling where per-request fees add up quickly","Users who need detailed API documentation or guaranteed SLAs","Applications requiring bulk product catalog queries across many product IDs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:51.069Z"},"updatedAt":"2026-04-22T20:00:30.185Z"}}