{"id":"2013172c-d908-4d40-8b73-c55f1fbd0f1e","shortId":"AkdJwK","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 55) via the x402 payment protocol. It is part of a broader platform that offers dozens of pay-per-request APIs 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/55/inventory` accepts POST requests and returns JSON. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0.02 USD per request, since USDC uses 6 decimals). Payment is settled on-chain on Base to the specified payTo address. No API keys or rate limits are advertised; access is granted purely through the x402 payment header.\n\nDocumentation on the site is extremely sparse — the docs, pricing, API, 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 valid 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-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 data endpoint"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content","No OpenAPI or request/response schema provided; input parameters and response format are unknown","The endpoint path references a specific product ID (55) with no explanation of what product this represents","Generic listing title 'Premium API Access' does not describe the actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/55/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/55/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, but documentation is essentially nonexistent — no OpenAPI spec, no request/response examples, no description of what 'product 55 inventory' actually returns. The listing title 'Premium API Access' is generic and uninformative. Pricing is clear ($0.02/request in USDC on Base), but without schema or docs this is effectively a 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'0.02':109 '000':104 '20':103 '402':206 '55':42 '6':116 'Base network API' 'USDC micropayment API' 'accept':89,225 'access':34,139 'actual':189 'address':130 'advertis':138 'ai/ml':67 'analyt':66 'api':63,132,158 'base':8,22,81,105,125 'base-network' 'behind':76 'bodi':196 'broader':53 'call':12,26 'chain':123 'challeng':97,207 'confirm':201 'connect':166 'contain':190 'content':172 'cost':101 'crypto':70 'data':65,188,217 'decim':117 'descript':183 'difficult':213 'doc':156 'document':148,210 'dozen':57 'endpoint':6,20,30,87,199 'exampl':180 'expect':197 'extrem':153 'field':193 'financ':69 'gate':3,17,75 'grant':141 'header':147 'id':41 'indic':98 'infer':68 'input':222 'inventori':5,19,38,187 'json':94 'json-response' 'key':133 'know':215 'limit':136 'live':202 'lowpaymentfee API' 'lowpaymentfee.com':32 'maximum':100 'micropay':78 'network':82 'no-api-key' 'offer':56 'on-chain':121 'openapi':176 'page':161 'paramet':223 'part':50 'pay':10,24,60 'pay-per-cal':9,23 'pay-per-call inventory' 'pay-per-request':59 'payment':46,118,146 'payto':129 'per':11,25,61,111 'platform':54 'post':90,195 'price':157 'product':4,18,37,40 'product data endpoint' 'product inventory API' 'product-inventory' 'prompt':168 'protocol':47 'provid':33 'pure':142 'rate':135 'readm':160 'render':163 'request':62,91,112 'request/response':179 'resourc':39 'return':93,203,219 'schema':177 'servic':73 'settl':120 'sinc':113 'site':151 'span':64 'spars':154 'specif':86 'specifi':128 'substant':171 'unit':106 'usd':110 'usdc':14,28,84,108,114 'usdc-micropayment' 'use':83,115 'util':72 'valid':205 'via':43 'wallet':167 'without':209 'x402':2,16,45,77,96,145 'x402 inventory endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"1ef8589e-f783-48ae-801d-0122cba34ba8","listingId":"2013172c-d908-4d40-8b73-c55f1fbd0f1e","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/55/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":"2026-04-18T18:36:20.316Z"}],"sources":[{"listingId":"2013172c-d908-4d40-8b73-c55f1fbd0f1e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/55/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:20.316Z","lastSeenAt":"2026-04-22T16:30:40.018Z"}],"details":{"listingId":"2013172c-d908-4d40-8b73-c55f1fbd0f1e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/55/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 network","source_url":"https://lowpaymentfee.com/api/v1/products/55/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 on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/55/inventory"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying inventory status 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 lookups with crypto micropayments","Developers experimenting with x402 payment protocol integrations","Use cases requiring keyless, pay-as-you-go API access on Base"],"notFor":["Production systems requiring well-documented request/response schemas","Users who need fiat payment options or cannot transact in USDC on Base","High-volume inventory queries where per-request pricing is impractical"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.108Z"},"updatedAt":"2026-04-22T16:30:40.018Z"}}