{"id":"bd80cbf2-3d29-4963-9fb8-6da5c5578d4f","shortId":"3EsEZQ","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 10) 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 micropayments on the Base network using USDC.\n\nThe specific endpoint `/api/v1/products/10/inventory` accepts POST requests and returns JSON. 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 its endpoints, with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled pages. The endpoint is confirmed live (returns a valid 402 challenge), but the actual behavior, request format, and response structure for the inventory resource are unknown beyond the MIME type (application/json).","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","product-inventory","pay-per-request","no-api-key","json-response"],"categories":["commerce","data"],"synonyms":["product inventory API","x402 inventory endpoint","USDC micropayment API","Base network API","pay-per-call inventory","lowpaymentfee API","product stock check"],"warnings":["No API documentation available — docs, pricing, and API pages all show only 'Connect wallet'","No OpenAPI or schema definition; request body format and response structure are completely unknown","The endpoint path references a specific product ID (10), suggesting this may be a demo or placeholder resource","The platform lists many endpoint categories but provides no technical details for any of them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/10/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/10/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 pricing is clear ($0.02/request in USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The purpose of a 'products/10/inventory' endpoint on what appears to be a demo/showcase platform is unclear. This is effectively a stub 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'/request':127 '0.02':115,126 '000':105 '0x8335':110 '10':42 '20':104 '402':193 '6':120 'Base network API' 'USDC micropayment API' 'accept':90 'access':34 'across':129 'actual':197 'addit':164 'advertis':124 'ai/ml':68 'analyt':67 'api':63,135,153 'application/json':214 'avail':180 'base':8,22,82,106,112 'base-network' 'behavior':198 'behind':77 'beyond':210 'broader':53 'call':12,26 'challeng':98,194 'commit':143 'confirm':188 'connect':159 'cost':102 'crawl':183 'crypto':71 'data':66 'decim':121 'detail':166 'doc':150 'document':145,175 'dozen':57 'endpoint':6,20,30,64,88,132,186 'equal':114 'exampl':179 'extrem':147 'financ':70 'format':200 'gate':3,17,76 'id':41 'indic':99 'infer':69 'inventori':5,19,38,206 'json':95 'json-response' 'key':136 'limit':139 'live':189 'lowpaymentfee API' 'lowpaymentfee.com':32 'maximum':101 'micropay':79 'mime':212 'minimum':142 'network':83 'no-api-key' 'offer':56 'openapi':170 'page':154,184 'part':50 'pay':10,24,60 'pay-per-cal':9,23 'pay-per-call inventory' 'pay-per-request':59 'payment':46 'per':11,25,61,116 'platform':54,123 'post':91 'price':128,151 'product':4,18,37,40 'product inventory API' 'product stock check' 'product-inventory' 'prompt':161 'protocol':47 'provid':33 'rate':138 'render':156 'request':62,92,117,199 'request/response':173 'requir':144 'resourc':39,207 'respons':202 'return':94,190 'schema':174 'servic':74 'span':65 'spars':148 'spec':171 'specif':87 'structur':203 'technic':165 'type':213 'uniform':125 'unit':107 'unknown':209 'usag':178 'usdc':14,28,85,109,118 'usdc-micropayment' 'use':84,119 'util':73 'valid':192 'via':43 'wallet':160 'x402':2,16,45,78,97 'x402 inventory endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"3367c937-9630-4b58-b60d-c6bc479921a8","listingId":"bd80cbf2-3d29-4963-9fb8-6da5c5578d4f","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/10/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":"2026-04-18T18:32:23.143Z"}],"sources":[{"listingId":"bd80cbf2-3d29-4963-9fb8-6da5c5578d4f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/10/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:23.143Z","lastSeenAt":"2026-04-22T21:30:18.153Z"}],"details":{"listingId":"bd80cbf2-3d29-4963-9fb8-6da5c5578d4f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/10/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 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/10/inventory"},{"claim":"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 is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/products/10/inventory"}],"useCases":["Querying inventory levels for a specific product via micropayment","Integrating pay-per-request inventory checks into an agent workflow","Accessing product data without API key registration"],"bestFor":["Agents that need on-demand inventory data with no subscription","Developers experimenting with x402 payment-gated APIs","Use cases requiring keyless, pay-as-you-go API access on Base"],"notFor":["Production inventory management requiring documented schemas and SLAs","High-volume inventory polling where per-request costs add up","Users who need detailed API documentation before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T19:47:19.151Z"},"updatedAt":"2026-04-22T21:30:18.153Z"}}