{"id":"244e1989-cc51-4ee8-ac4b-0185fa910330","shortId":"x4XKqj","kind":"x402","title":"x402-gated product inventory endpoint on Base, paid per-request in USDC.","tagline":"x402-gated product inventory endpoint on Base, paid per-request in USDC.","description":"This endpoint at lowpaymentfee.com provides access to a product inventory resource (product ID 11) behind an x402 paywall. The provider operates a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services, all settled on the Base network using USDC.\n\nThe specific endpoint `/api/v1/products/11/inventory` accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers receive a 402 challenge with payment parameters, settle in USDC on Base, and include the payment proof in an X-PAYMENT header. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. The provider advertises a flat $0.02/request price across all endpoints, no API keys, no rate limits, and instant access.\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 description of what the inventory data actually contains. The endpoint is live (returns a valid x402 challenge), but the lack of documentation makes it difficult to know what fields to send or what shape the response takes.","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","pay-per-call inventory","USDC API","Base network API","lowpaymentfee","product data endpoint"],"warnings":["No documentation available — all doc pages render only 'Connect wallet'","No OpenAPI or input/output schema provided; request body format is unknown","The specific data returned by this inventory endpoint is undocumented","Provider hosts many endpoints but none appear to have public documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/11/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/11/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 documentation is essentially nonexistent — every doc page shows only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what 'Premium API Access' for product 11 inventory actually returns. The listing is effectively a 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'/request':143 '0.02':135,142 '000':126 '11':42 '20':125 '402':97 '6':131 'Base network API' 'USDC API' 'accept':81 'access':34,156 'across':145 'actual':195 'advertis':139 'ai/ml':62 'amount':120 'analyt':61 'api':58,149,164 'base':8,22,73,106,127 'base-network' 'behind':43 'broad':51 'call':57,123 'caller':94 'catalog':52 'challeng':98,205 'connect':172 'contain':196 'content':178 'crypto':65 'data':60,194 'decim':132 'descript':189 'difficult':213 'doc':162 'document':157,210 'endpoint':6,20,30,79,147,198 'equal':134 'exampl':186 'extrem':159 'field':217 'financ':64 'flat':141 'gate':3,17 'handl':89 'header':117 'id':41 'includ':108 'infer':63 'instant':155 'inventori':5,19,38,193 'json':86 'key':150 'know':215 'lack':208 'limit':153 'live':200 'lowpaymentfee' 'lowpaymentfee.com':32 'make':211 'maximum':119 'network':74 'no-api-key' 'openapi':182 'oper':49 'page':167 'paid':9,23 'paramet':101 'pay':55 'pay-per-cal':54 'pay-per-call inventory' 'pay-per-request' 'payment':87,100,110,116 'paywal':46 'per':11,25,56,122 'per-request':10,24 'post':82 'price':144,163 'product':4,18,37,40 'product data endpoint' 'product inventory API' 'product-inventory' 'prompt':174 'proof':111 'protocol':93 'provid':33,48,138 'rate':152 'readm':166 'receiv':95 'render':169 'request':12,26,83 'request/response':185 'requir':121 'resourc':39 'respons':224 'return':85,201 'schema':183 'send':219 'servic':68 'settl':70,102 'shape':222 'span':59 'spars':160 'specif':78 'substant':177 'take':225 'unit':128 'usd':136 'usdc':14,28,76,104,130 'usdc-settlement' 'use':75 'util':67 'valid':203 'via':90 'wallet':173 'x':115 'x-payment':114 'x402':2,16,45,92,204 'x402 inventory' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"5150b37e-f7a3-49ac-b60f-c64f75ef7f12","listingId":"244e1989-cc51-4ee8-ac4b-0185fa910330","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/11/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":"2026-04-18T18:34:42.467Z"}],"sources":[{"listingId":"244e1989-cc51-4ee8-ac4b-0185fa910330","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/11/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:42.467Z","lastSeenAt":"2026-04-22T20:00:28.584Z"}],"details":{"listingId":"244e1989-cc51-4ee8-ac4b-0185fa910330","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/11/inventory \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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/11/inventory"},{"claim":"The provider advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/11/inventory"}],"useCases":["Querying product inventory levels programmatically with per-request USDC payment","Integrating inventory checks into agent workflows without API key provisioning","Building commerce automation that pays per call on Base L2"],"bestFor":["Agents or bots that need on-demand inventory data without subscription commitments","Developers experimenting with x402 payment-gated APIs","Crypto-native applications already operating on Base"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","High-volume inventory polling where $0.02/request adds up quickly","Non-crypto users who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:50:07.797Z"},"updatedAt":"2026-04-22T20:00:28.584Z"}}