{"id":"0180e2ae-eb11-465c-9511-f2dcd2bc64f9","shortId":"j3F5fc","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 76) 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 micropayments on the Base network using USDC.\n\nThe specific endpoint `/api/v1/products/76/inventory` is listed as \"Premium API Access\" and accepts HTTP POST requests. Payment is settled on-chain on Base via USDC (contract 0x8335…2913) with a maximum amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The platform advertises flat $0.02/request pricing across all its endpoints, with no API keys, no rate limits, and no minimum commitments required.\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 proper 402 x402 challenge), but without documentation it is difficult to know what data is returned or what input parameters are accepted.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","product-inventory","pay-per-request","no-api-key"],"categories":["commerce","data"],"synonyms":["product inventory API","x402 inventory endpoint","micropayment API","USDC pay-per-call","lowpaymentfee","Base network API","product data API"],"warnings":["No documentation available — all doc/pricing/API/README pages render only 'Connect wallet'","No OpenAPI or input/output schema provided; request body format is unknown","The specific data returned by the inventory endpoint is undocumented","The endpoint path references a specific product ID (76); unclear if other product IDs are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/76/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/76/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 with a valid x402 402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what the inventory data contains or what POST body is expected. The listing is effectively a 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'/request':134 '0.02':124,133 '000':119 '0x8335':111 '20':118 '2913':112 '402':207 '6':127 '76':42 'Base network API' 'USDC pay-per-call' 'accept':96,227 'access':34,94 'across':136 'actual':190 'advertis':131 'ai/ml':67 'amount':116 'analyt':66 'api':63,93,142,158 'base':8,22,81,107,120 'base-network' 'behind':76 'bodi':197 'broader':53 'call':62 'chain':105 'challeng':209 'commit':150 'confirm':202 'connect':167 'contain':191 'content':173 'contract':110 'crypto':70 'data':65,189,219 'decim':128 'descript':184 'difficult':215 'doc':157 'document':152,212 'dozen':57 'endpoint':6,20,30,87,139,200 'equal':123 'exampl':181 'expect':198 'extrem':154 'field':194 'financ':69 'flat':132 'gate':3,17,75 'http':97 'id':41 'infer':68 'input':224 'inventori':5,19,38,188 'key':143 'know':217 'limit':146 'list':90 'live':203 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':115 'micropay':78 'micropayment API' 'minimum':149 'network':82 'no-api-key' 'offer':56 'on-chain':103 'openapi':177 'page':162 'paramet':225 'part':50 'pay':10,24,60 'pay-per-cal':59 'pay-per-request':9,23 'payment':46,100 'per':11,25,61 'platform':54,130 'post':98,196 'premium':92 'price':135,159 'product':4,18,37,40 'product data API' 'product inventory API' 'product-inventory' 'prompt':169 'proper':206 'protocol':47 'provid':33 'rate':145 'readm':161 'render':164 'request':12,26,99 'request/response':180 'requir':151 'resourc':39 'return':204,221 'schema':178 'servic':73 'settl':102 'span':64 'spars':155 'specif':86 'substant':172 'unit':121 'usdc':14,28,84,109,125 'usdc-settlement' 'use':83,126 'util':72 'via':43,108 'wallet':168 'without':211 'x402':2,16,45,77,208 'x402 inventory endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"9a668679-7fe9-4585-aab0-fcacb9aff0e2","listingId":"0180e2ae-eb11-465c-9511-f2dcd2bc64f9","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/76/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":"2026-04-18T18:35:32.513Z"}],"sources":[{"listingId":"0180e2ae-eb11-465c-9511-f2dcd2bc64f9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/76/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:32.513Z","lastSeenAt":"2026-04-22T18:30:46.786Z"}],"details":{"listingId":"0180e2ae-eb11-465c-9511-f2dcd2bc64f9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/76/inventory \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/76/inventory"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/76/inventory"}],"useCases":["Querying inventory status for a specific product via micropayment","Integrating pay-per-call product data into an agent workflow","Accessing product inventory without traditional API key registration"],"bestFor":["Agents that need on-demand product inventory data with crypto micropayments","Developers exploring x402 protocol integrations on Base","Use cases requiring keyless, pay-as-you-go API access"],"notFor":["Users who need detailed API documentation or schema before integrating","High-volume inventory queries where per-request pricing may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.457Z"},"updatedAt":"2026-04-22T18:30:46.786Z"}}