{"id":"83381f69-adcd-461d-bbc2-63a884e0a959","shortId":"7x8cYT","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 87) via the x402 payment protocol. The endpoint is live and returns a 402 challenge requiring payment in USDC on the Base network. The cost per request is $0.02 (20,000 base units of USDC with 6 decimals). The endpoint accepts POST requests and returns JSON.\n\nThe broader lowpaymentfee.com platform hosts a variety of x402-gated APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are advertised at $0.02 per request with no API keys, no rate limits, and instant access via the Base network.\n\nThe specific endpoint `/api/v1/products/87/inventory` is labeled \"Premium API Access\" in the x402 challenge but lacks detailed documentation about what inventory data it returns, what POST body it expects, or what the response schema looks like. The docs, pricing, and API pages on the site all render only a \"Connect wallet\" prompt with no further content, so the actual functionality and response format remain unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","product-inventory","json-response","post-method"],"categories":["commerce","data"],"synonyms":["product inventory API","inventory lookup","x402 inventory","lowpaymentfee inventory","product data endpoint","USDC pay-per-call API"],"warnings":["No documentation available — docs, pricing, and API pages all render only 'Connect wallet' with no content.","No request body schema or response schema documented; unclear what data this endpoint actually returns.","The endpoint is labeled 'Premium API Access' generically, giving no indication of the actual inventory data provided.","Cannot verify what product ID 87 refers to or whether the inventory data is real or a demo placeholder."],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/87/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/87/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 402 challenge, but there is no documentation on request body format, response schema, or what 'product 87 inventory' actually contains. The docs pages are empty (just 'Connect wallet'). The listing is effectively a stub with confirmed 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'0.02':70,132 '000':72 '20':71 '402':55 '6':78 '87':42 'USDC pay-per-call API' 'accept':82 'access':34,144,157 'actual':206 'advertis':130 'ai/ml':103 'analysi':106 'analyt':102 'api':99,137,156,188 'base':8,22,63,73,147 'bodi':174 'broader':89 'challeng':56,161 'classif':108 'connect':197 'content':203 'convers':125 'cost':66 'data':101,169 'decim':79 'detail':164 'doc':185 'document':165 'embed':109 'endpoint':6,20,30,49,81,128,151 'estim':119 'exchang':114 'expect':176 'feed':113 'financ':110 'format':210 'function':207 'gas':118 'gate':3,17,98 'generat':126 'geocod':123 'host':92 'id':41 'infer':104 'infrastructur':121 'instant':143 'inventori':5,19,38,168 'inventory lookup' 'json':87 'json-response' 'key':138 'label':154 'lack':163 'like':183 'limit':141 'live':51 'look':182 'lowpaymentfee inventory' 'lowpaymentfee.com':32,90 'network':64,148 'page':189 'pay':10,24 'pay-per-request':9,23 'payment':46,58 'per':11,25,67,133 'platform':91 'post':83,173 'post-method' 'premium':155 'price':112,186 'product':4,18,37,40 'product data endpoint' 'product inventory API' 'product-inventory' 'prompt':199 'protocol':47 'provid':33 'quot':117 'rate':115,140 'remain':211 'render':194 'request':12,26,68,84,134 'requir':57 'resourc':39 'respons':180,209 'return':53,86,171 'schema':181 'sentiment':105 'site':192 'span':100 'specif':150 'summar':107 'token':116 'unclear':212 'unit':74 'usdc':14,28,60,76 'usdc-base' 'util':122 'valid':124 'varieti':94 'via':43,145 'wallet':198 'web3':111 'x402':2,16,45,97,160 'x402 inventory' 'x402-gated':1,15,96 'x402-payment'","prices":[{"id":"fd6b0b66-22a4-4936-9081-32bc0cf36035","listingId":"83381f69-adcd-461d-bbc2-63a884e0a959","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/87/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":"2026-04-18T18:32:28.544Z"}],"sources":[{"listingId":"83381f69-adcd-461d-bbc2-63a884e0a959","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/87/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:28.544Z","lastSeenAt":"2026-04-22T21:30:18.383Z"}],"details":{"listingId":"83381f69-adcd-461d-bbc2-63a884e0a959","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/87/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 x402Version 1, requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/87/inventory"},{"claim":"maxAmountRequired is 20000 base units of USDC (USD Coin, 6 decimals) = $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/products/87/inventory"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, and API pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying inventory status for a specific product via a pay-per-request model","Integrating product inventory checks into an agent workflow without API key management","Programmatic inventory monitoring with crypto-native micropayments"],"bestFor":["Agents or bots that need on-demand inventory data without subscription commitments","Developers experimenting with x402 payment protocol integrations","Crypto-native applications on Base that want frictionless API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume inventory queries where per-request pricing may not be cost-effective","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:23:13.014Z"},"updatedAt":"2026-04-22T21:30:18.383Z"}}