{"id":"423678b3-4a4e-4324-ba89-05ea58db7840","shortId":"8HhEPq","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 52) 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/52/inventory` is described 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. Payment is made inline via the X-PAYMENT header per the x402 protocol.\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 detailed description of what the inventory endpoint actually returns. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation makes it difficult to know what data to send or what response to expect.","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 OpenAPI or schema documentation available — request body and response format are unknown","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","The endpoint description 'Premium API Access' is generic and does not describe the actual data returned","Cannot verify what data the inventory endpoint provides without documentation or example responses"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/52/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/52/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, but there is no OpenAPI schema, no documentation, no request/response examples, and no description of what the inventory endpoint actually returns. The listing title 'Premium API Access' is generic and uninformative. Nearly all fields must be 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'/request':136 '0.02':124,135 '000':113 '0x8335':118 '20':112 '2913':119 '402':220 '52':42 '6':129 'Base network API' 'USDC micropayment API' 'accept':101 'access':34,99 'across':138 'actual':210 'advertis':133 'ai/ml':72 'analyt':71 'api':68,98,144,177 'base':8,22,88,114,121 'base-network' 'behind':80 'call':12,26 'challeng':106,221 'commit':152 'confirm':215 'connect':186 'content':192 'cost':110 'data':70,233 'decim':130 'describ':95 'descript':204 'detail':203 'difficult':229 'doc':176 'document':168,226 'endpoint':6,20,30,53,92,141,209,213 'equal':123 'exampl':200 'expect':240 'extrem':173 'financ':74 'gate':3,17,79 'header':163 'host':60 'id':41 'indic':107 'infer':73 'inlin':157 'inventori':5,19,38,208 'key':145 'know':231 'lack':224 'limit':148 'live':216 'lowpaymentfee' 'lowpaymentfee.com':32,57 'made':156 'make':227 'mani':52 'maximum':109 'micropay':82 'minimum':151 'network':89 'no-api-key' 'offer':54 'one':50 'openapi':196 'page':181 'pay':10,24,65 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request':64 'payment':46,154,162 'per':11,25,66,125,164 'platform':58,132 'post':102 'premium':97 'price':137,178 'product':4,18,37,40 'product data endpoint' 'product inventory API' 'product-inventory' 'prompt':188 'proper':219 'protocol':47,167 'provid':33 'rate':147 'readm':180 'render':183 'request':67,103,126 'request/response':199 'requir':153 'resourc':39 'respons':238 'return':211,217 'schema':197 'send':235 'servic':77 'settl':83 'site':171 'span':69 'spars':174 'specif':91 'substant':191 'uniform':134 'unit':115 'usdc':14,28,85,117,127 'usdc-settlement' 'use':128 'util':76 'varieti':62 'via':43,158 'wallet':187 'x':161 'x-payment':160 'x402':2,16,45,81,105,166 'x402 inventory endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"25577beb-dd60-454d-a39c-8871bf0f9968","listingId":"423678b3-4a4e-4324-ba89-05ea58db7840","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/52/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":"2026-04-18T18:35:33.116Z"}],"sources":[{"listingId":"423678b3-4a4e-4324-ba89-05ea58db7840","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/52/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:33.116Z","lastSeenAt":"2026-04-22T18:30:46.886Z"}],"details":{"listingId":"423678b3-4a4e-4324-ba89-05ea58db7840","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/52/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/52/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/52/inventory"}],"useCases":["Querying product inventory data with per-request USDC micropayments","Integrating inventory checks into agent workflows without API key management","Programmatic access to product stock information via x402 protocol"],"bestFor":["Agents or services needing on-demand inventory lookups with crypto micropayments","Developers exploring x402 protocol integrations on Base","Use cases where no-signup, pay-per-call access is preferred"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","High-volume inventory queries where per-request pricing may not be cost-effective","Non-crypto workflows that cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.352Z"},"updatedAt":"2026-04-22T18:30:46.886Z"}}