{"id":"fcb04a36-f587-4540-80b8-dbbc7a245d7b","shortId":"MckDQ9","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 38) via the x402 payment protocol. It is part of a broader platform that offers dozens of pay-per-request API endpoints 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/38/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… on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform advertises flat $0.02/request pricing across all 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 challenge), but without documentation it is difficult to know what data is returned or what input is required.","tags":[],"capabilities":["x402-payment","usdc-micropayment","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 format and output structure are unknown","The endpoint is labeled 'Premium API Access' with no further description of what inventory data is returned","Product ID 38 is hardcoded in the path with no context about what product it refers to"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/38/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/38/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 and clear pricing ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no documentation, no request/response examples, and no description of what the inventory data actually contains. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':133 '0.02':121,132 '000':111 '0x8335':116 '20':110 '38':42 '402':205 '6':126 'Base network API' 'USDC micropayment API' 'accept':99 'access':34,97 'across':135 'actual':188 'advertis':130 'ai/ml':68 'analyt':67 'api':63,96,140,156 'base':8,22,84,112,118 'base-network' 'behind':77 'bodi':195 'broader':53 'call':12,26 'challeng':104,206 'commit':148 'confirm':200 'connect':165 'contain':189 'content':171 'cost':108 'crypto':71 'data':66,187,216 'decim':127 'descript':182 'difficult':212 'doc':155 'document':150,209 'dozen':57 'endpoint':6,20,30,64,90,137,198 'equal':120 'exampl':179 'expect':196 'extrem':152 'field':192 'financ':70 'flat':131 'gate':3,17,76 'id':41 'indic':105 'infer':69 'input':221 'inventori':5,19,38,186 'key':141 'know':214 'limit':144 'list':93 'live':201 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':107 'micro':80 'micro-pay':79 'minimum':147 'network':85 'no-api-key' 'offer':56 'openapi':175 'page':160 'part':50 'pay':10,24,60 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request':59 'payment':46,81 'per':11,25,61,122 'platform':54,129 'post':100,194 'premium':95 'price':134,157 'product':4,18,37,40 'product data endpoint' 'product inventory API' 'product-inventory' 'prompt':167 'proper':204 'protocol':47 'provid':33 'rate':143 'readm':159 'render':162 'request':62,101,123 'request/response':178 'requir':149,223 'resourc':39 'return':202,218 'schema':176 'servic':74 'span':65 'spars':153 'specif':89 'substant':170 'unit':113 'usdc':14,28,87,115,124 'usdc-micropayment' 'use':86,125 'util':73 'via':43 'wallet':166 'without':208 'x402':2,16,45,78,103 'x402 inventory endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"e2bd568a-f8f4-4398-924c-0c62cb1ae25d","listingId":"fcb04a36-f587-4540-80b8-dbbc7a245d7b","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/38/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":"2026-04-18T18:35:46.996Z"}],"sources":[{"listingId":"fcb04a36-f587-4540-80b8-dbbc7a245d7b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/38/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:46.996Z","lastSeenAt":"2026-04-22T18:30:48.009Z"}],"details":{"listingId":"fcb04a36-f587-4540-80b8-dbbc7a245d7b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/38/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 of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/38/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/38/inventory"}],"useCases":["Querying product inventory data for product ID 38 via a single micro-payment","Integrating pay-per-request inventory lookups into agent workflows without API key management","Programmatic inventory checks settled on Base L2 with USDC"],"bestFor":["Agents or applications needing on-demand inventory data without subscription commitments","Developers experimenting with x402 payment-gated APIs on Base","Low-volume, pay-as-you-go inventory queries"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","High-volume inventory monitoring where per-request fees add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.749Z"},"updatedAt":"2026-04-22T18:30:48.009Z"}}