{"id":"f95bcf9c-437f-4f65-a080-b7053a84ec03","shortId":"9UtHSh","kind":"x402","title":"x402-gated product inventory endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated product inventory endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com provides access to a product inventory resource (product ID 27) via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance, and utility services — all gated behind x402 micropayments settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/products/27/inventory` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…2913 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, 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 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","USDC micropayment API","lowpaymentfee","pay-per-call API","Base network API","product data endpoint"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet' with no content","No OpenAPI or request/response schema provided; input parameters and output format are unknown","The specific purpose and data returned by the /products/27/inventory endpoint is undocumented","Cannot verify what 'Premium API Access' actually delivers beyond the endpoint being live"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/27/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/27/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 the inventory data actually contains. The listing is effectively a 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'/request':136 '0.02':124,135 '000':113 '0x8335':118 '20':112 '27':42 '2913':119 '402':212 '6':129 'Base network API' 'USDC micropayment API' 'accept':101,231 'access':34,99 'across':138 'actual':195 'advertis':133 'ai/ml':72 'analyt':71 'api':68,98,144,163 'base':8,22,88,114,121 'base-network' 'behind':80 'bodi':202 'call':12,26 'challeng':106,213 'commit':152 'confirm':207 'connect':172 'contain':196 'content':178 'cost':110 'data':70,194,223 'decim':130 'descript':189 'difficult':219 'doc':162 'document':154,216 'endpoint':6,20,30,53,92,141,205 'equal':123 'exampl':186 'expect':203 'extrem':159 'field':199 'financ':74 'gate':3,17,79 'host':60 'id':41 'indic':107 'infer':73 'input':228 'inventori':5,19,38,193 'key':145 'know':221 'limit':148 'list':95 'live':208 'lowpaymentfee' 'lowpaymentfee.com':32,57 'mani':52 'maximum':109 'micropay':82 'minimum':151 'network':89 'no-api-key' 'offer':54 'one':50 'openapi':182 'page':167 'paramet':229 'pay':10,24,65 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request':64 'payment':46 'per':11,25,66,125 'platform':58,132 'post':102,201 'premium':97 'price':137,164 'product':4,18,37,40 'product data endpoint' 'product inventory API' 'product-inventory' 'prompt':174 'proper':211 'protocol':47 'provid':33 'rate':147 'readm':166 'render':169 'request':67,103,126 'request/response':185 'requir':153 'resourc':39 'return':209,225 'schema':183 'servic':77 'settl':83 'site':157 'span':69 'spars':160 'specif':91 'substant':177 'uniform':134 'unit':115 'usdc':14,28,85,117,127 'usdc-settlement' 'use':128 'util':76 'varieti':62 'via':43 'wallet':173 'without':215 'x402':2,16,45,81,105 'x402 inventory endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"6a43c471-7ee1-487d-92c3-9ce7a36b1996","listingId":"f95bcf9c-437f-4f65-a080-b7053a84ec03","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/27/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":"2026-04-18T18:35:10.862Z"}],"sources":[{"listingId":"f95bcf9c-437f-4f65-a080-b7053a84ec03","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/27/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:10.862Z","lastSeenAt":"2026-04-22T19:30:36.311Z"}],"details":{"listingId":"f95bcf9c-437f-4f65-a080-b7053a84ec03","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/27/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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/27/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 contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/27/inventory"}],"useCases":["Querying inventory status for a specific product via micropayment","Integrating pay-per-request product data into an agent workflow","Accessing product inventory without API key registration"],"bestFor":["Agents that need on-demand product inventory data with no signup","Developers exploring x402 micropayment-gated APIs","Use cases requiring low-cost, no-commitment API access on Base"],"notFor":["Users who need detailed API documentation or schema before integrating","High-volume inventory queries where per-request pricing may add up","Anyone needing non-USDC or non-Base payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:51.483Z"},"updatedAt":"2026-04-22T19:30:36.311Z"}}