{"id":"a2b6d650-52ce-4549-8aef-862a25bffb5b","shortId":"QVsHrE","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 66) via the x402 payment protocol. It is part of a broader platform that offers a variety of pay-per-call APIs 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/66/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 its endpoints, with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation on the site 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 data actually contains or what fields the POST body expects. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation makes it difficult to use without experimentation.","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","x402 inventory endpoint","USDC micropayment API","Base network API","pay-per-call inventory","lowpaymentfee API","product data endpoint"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content","No OpenAPI or request/response schema provided; request body format is unknown","The endpoint path references a specific product ID (66) with no explanation of what product this is or how to discover other product IDs","The listing title 'Premium API Access' is generic and does not describe the actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/66/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/66/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 there is no documentation, no OpenAPI schema, no request/response examples, and no description of what the inventory data actually contains. The listing title 'Premium API Access' is generic and uninformative. Effectively a 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'/request':127 '0.02':115,126 '000':105 '0x8335':110 '20':104 '402':203 '6':120 '66':42 'Base network API' 'USDC micropayment API' 'accept':90 'access':34 'across':129 'actual':186 'advertis':124 'ai/ml':68 'analyt':67 'api':64,135,155 'base':8,22,82,106,112 'base-network' 'behind':77 'bodi':193 'broader':53 'call':63 'challeng':98,204 'commit':143 'confirm':198 'connect':163 'contain':187 'content':169 'cost':102 'crypto':71 'data':66,185 'decim':121 'descript':180 'difficult':212 'doc':153 'document':145,209 'endpoint':6,20,30,88,132,196 'equal':114 'exampl':177 'expect':194 'experiment':216 'extrem':150 'field':190 'financ':70 'gate':3,17,76 'id':41 'indic':99 'infer':69 'inventori':5,19,38,184 'json':95 'json-response' 'key':136 'lack':207 'limit':139 'live':199 'lowpaymentfee API' 'lowpaymentfee.com':32 'make':210 'maximum':101 'micropay':79 'minimum':142 'network':83 'no-api-key' 'offer':56 'openapi':173 'page':158 'part':50 'pay':10,24,61 'pay-per-cal':60 'pay-per-call inventory' 'pay-per-request':9,23 'payment':46 'per':11,25,62,116 'platform':54,123 'post':91,192 'price':128,154 'product':4,18,37,40 'product data endpoint' 'product inventory API' 'product-inventory' 'prompt':165 'proper':202 'protocol':47 'provid':33 'rate':138 'readm':157 'render':160 'request':12,26,92,117 'request/response':176 'requir':144 'resourc':39 'return':94,200 'schema':174 'servic':74 'site':148 'span':65 'spars':151 'specif':87 'substant':168 'uniform':125 'unit':107 'usdc':14,28,85,109,118 'usdc-micropayment' 'use':84,119,214 'util':73 'varieti':58 'via':43 'wallet':164 'without':215 'x402':2,16,45,78,97 'x402 inventory endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"a07dd8c5-ff06-452f-b316-c50335971f85","listingId":"a2b6d650-52ce-4549-8aef-862a25bffb5b","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/66/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":"2026-04-18T18:35:35.525Z"}],"sources":[{"listingId":"a2b6d650-52ce-4549-8aef-862a25bffb5b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/66/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:35.525Z","lastSeenAt":"2026-04-22T18:30:47.203Z"}],"details":{"listingId":"a2b6d650-52ce-4549-8aef-862a25bffb5b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/66/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 maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/66/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":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/products/66/inventory"}],"useCases":["Querying inventory status for a specific product via micropayment","Integrating pay-per-call product data into agent workflows","Accessing inventory data without API key registration"],"bestFor":["Agents that need on-demand product inventory checks without subscription commitments","Developers experimenting with x402 micropayment-gated APIs","Workflows requiring keyless, pay-as-you-go data access on Base"],"notFor":["Users needing well-documented APIs with clear request/response schemas","High-volume inventory polling where per-request costs add up","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.26Z"},"updatedAt":"2026-04-22T18:30:47.203Z"}}