{"id":"42e48b41-ff57-45cb-b5ee-0dc67cadf9e0","shortId":"ZmcqRu","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 22) behind an x402 paywall. It is part of a broader platform that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance, crypto, infrastructure utilities, and more — all settled on the Base network using USDC.\n\nThe specific endpoint `/api/v1/products/22/inventory` is listed as \"Premium API Access\" and accepts HTTP POST requests. 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 endpoints, with no API keys, no rate limits, no minimums, and instant access.\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 is required beyond a POST request.","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","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","product data endpoint"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","No OpenAPI or schema describing request body or response format for this endpoint","The purpose and data returned by '/api/v1/products/22/inventory' is unclear — 'Premium API Access' is a generic label","Cannot verify what inventory data is actually served without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/22/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/22/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 with clear pricing, but there is no documentation, no OpenAPI schema, no request/response examples, and no description of what data the inventory endpoint actually returns. The listing is effectively a stub with confirmed 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'/request':129 '0.02':117,128 '000':107 '0x8335':112 '20':106 '22':42 '402':201 '6':122 'Base network API' 'USDC micropayment API' 'accept':94 'access':34,92,145 'across':131 'actual':184 'advertis':126 'ai/ml':67 'analyt':66 'api':62,91,136,152 'base':8,22,79,108,114 'base-network' 'behind':43 'beyond':221 'bodi':191 'broader':52 'call':61 'challeng':100,203 'confirm':196 'connect':161 'contain':185 'content':167 'cost':104 'crypto':70 'data':65,183,213 'decim':123 'descript':178 'difficult':209 'doc':151 'document':146,206 'dozen':56 'endpoint':6,20,30,63,85,133,194 'equal':116 'exampl':175 'expect':192 'extrem':148 'field':188 'financ':69 'gate':3,17 'http':95 'id':41 'indic':101 'infer':68 'infrastructur':71 'input':218 'instant':144 'inventori':5,19,38,182 'key':137 'know':211 'limit':140 'list':88 'live':197 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':103 'minimum':142 'network':80 'no-api-key' 'offer':55 'openapi':171 'page':156 'paid':9,23 'part':49 'pay':59 'pay-per-cal':58 'pay-per-call API' 'pay-per-request' 'paywal':46 'per':11,25,60,118 'per-request':10,24 'platform':53,125 'post':96,190,223 'premium':90 'price':130,153 'product':4,18,37,40 'product data endpoint' 'product inventory API' 'product-inventory' 'prompt':163 'proper':200 'provid':33 'rate':139 'readm':155 'render':158 'request':12,26,97,119,224 'request/response':174 'requir':220 'resourc':39 'return':198,215 'schema':172 'settl':76 'span':64 'spars':149 'specif':84 'substant':166 'uniform':127 'unit':109 'usdc':14,28,82,111,120 'usdc-settlement' 'use':81,121 'util':72 'wallet':162 'without':205 'x402':2,16,45,99,202 'x402 inventory endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"76a05620-adf0-4afd-b82d-3b103794e353","listingId":"42e48b41-ff57-45cb-b5ee-0dc67cadf9e0","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/22/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":"2026-04-18T18:35:13.243Z"}],"sources":[{"listingId":"42e48b41-ff57-45cb-b5ee-0dc67cadf9e0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/22/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:13.243Z","lastSeenAt":"2026-04-22T19:30:36.415Z"}],"details":{"listingId":"42e48b41-ff57-45cb-b5ee-0dc67cadf9e0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/22/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 of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/22/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 on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/22/inventory"}],"useCases":["Querying product inventory data for product ID 22 via a single paid API call","Integrating pay-per-request inventory checks into automated agent workflows","Accessing inventory information without managing API keys or subscriptions"],"bestFor":["Agents that need on-demand inventory data with no subscription overhead","Developers experimenting with x402 payment-gated APIs on Base","Workflows requiring low-cost, keyless API access settled in USDC"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume inventory polling where per-request costs would accumulate","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:51.375Z"},"updatedAt":"2026-04-22T19:30:36.415Z"}}