{"id":"b10ccb43-9327-4753-9053-2fbe569f9db8","shortId":"E5rrcB","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 58) 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 micro-payments on the Base network using USDC.\n\nThe specific endpoint `/api/v1/products/58/inventory` is listed as \"Premium API Access\" and accepts POST requests. Payment is settled on-chain on Base using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum cost of 0.02 USDC per request (20,000 base units at 6 decimals). The x402 challenge was successfully captured, confirming the endpoint is live and responding with a proper 402 Payment Required challenge. There are no API keys or rate limits advertised; access is granted purely through per-request payment.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned 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's purpose — whether it returns stock levels, product details, or something else — must be inferred entirely from the URL path and the generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-pricing","product-inventory","post-method"],"categories":["commerce","data"],"synonyms":["product inventory API","x402 inventory endpoint","pay-per-call inventory","USDC micropayment API","lowpaymentfee inventory","Base network API","product stock API"],"warnings":["No API documentation available — docs, pricing, API, and README pages all return only a wallet-connect prompt","No OpenAPI or input/output schema provided; request body format is unknown","The purpose and data returned by the /products/58/inventory endpoint is unclear","Cannot verify what 'Premium API Access' actually delivers beyond the URL path"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/58/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/58/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 explanation of what the inventory endpoint actually returns. The listing is effectively a 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'0.02':119 '000':124 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':113 '20':123 '402':146 '58':42 '6':128 'Base network API' 'USDC micropayment API' 'accept':99 'access':34,97,159,243 'actual':207 'advertis':158 'ai/ml':68 'analyt':67 'api':64,96,153,175,242 'base':8,22,84,109,125 'base-network' 'behind':77 'bodi':214 'broader':53 'call':63 'captur':135 'chain':107 'challeng':132,149 'confirm':136 'connect':184 'contain':208 'content':190 'contract':112 'cost':117 'crawl':173 'crypto':71 'data':66,206 'decim':129 'descript':201 'detail':226 'doc':174 'document':168 'els':229 'endpoint':6,20,30,90,138,217 'entir':233 'exampl':198 'expect':215 'extrem':170 'field':211 'financ':70 'gate':3,17,76 'generic':240 'grant':161 'id':41 'infer':69,232 'inventori':5,19,38,205 'key':154 'label':244 'level':224 'limit':157 'list':93 'live':140 'lowpaymentfee inventory' 'lowpaymentfee.com':32 'maximum':116 'micro':80 'micro-pay':79 'must':230 'network':85 'offer':56 'on-chain':105 'openapi':194 'page':179 'part':50 'path':237 'pay':10,24,61 'pay-per-cal':60 'pay-per-call inventory' 'pay-per-request':9,23 'payment':46,81,102,147,167 'per':11,25,62,121,165 'per-request':164 'per-request-pricing' 'platform':54 'post':100,213 'post-method' 'premium':95,241 'price':176 'product':4,18,37,40,225 'product inventory API' 'product stock API' 'product-inventory' 'prompt':186 'proper':145 'protocol':47 'provid':33 'pure':162 'purpos':219 'rate':156 'readm':178 'request':12,26,101,122,166 'request/response':197 'requir':148 'resourc':39 'respond':142 'return':181,222 'schema':195 'servic':74 'settl':104 'someth':228 'span':65 'spars':171 'specif':89 'stock':223 'substant':189 'success':134 'unit':126 'url':236 'usdc':14,28,87,111,120 'usdc-settlement' 'use':86,110 'util':73 'varieti':58 'via':43 'wallet':185 'whether':220 'x402':2,16,45,78,131 'x402 inventory endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"2cde583b-dc21-43c6-b4ae-aa5b3797fa8e","listingId":"b10ccb43-9327-4753-9053-2fbe569f9db8","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/58/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":"2026-04-18T18:34:47.949Z"}],"sources":[{"listingId":"b10ccb43-9327-4753-9053-2fbe569f9db8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/58/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:47.949Z","lastSeenAt":"2026-04-22T20:00:28.808Z"}],"details":{"listingId":"b10ccb43-9327-4753-9053-2fbe569f9db8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/58/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 valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/58/inventory"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/58/inventory"},{"claim":"Docs, API, pricing, and README pages return only a 'Connect wallet' prompt with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying inventory or stock data for a specific product via micropayment","Integrating pay-per-request product data into an agent workflow without API keys","Demonstrating x402 payment protocol integration on Base"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents needing keyless, on-demand product data access","Projects requiring USDC micropayment settlement on Base"],"notFor":["Production use cases requiring documented request/response schemas","High-volume inventory queries where per-request pricing is inefficient","Users who need detailed API documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:22:52.976Z"},"updatedAt":"2026-04-22T20:00:28.808Z"}}