{"id":"04910003-96f2-4001-b218-b4b2a9b12d61","shortId":"skKezY","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 35) via the x402 payment protocol. It is part of a broader platform that offers dozens of pay-per-call 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/35/inventory` is labeled \"Premium API Access\" by the provider. The x402 challenge confirms it is live, accepting POST requests, and requires a maximum payment of 20,000 base units of USDC (0.02 USD per request, since USDC uses 6 decimals). Payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on the Base L2 network. No API keys or rate limits are advertised; access is purely payment-gated.\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 exact functionality — whether it returns stock levels, product metadata, or something else — cannot be determined from available material.","tags":[],"capabilities":["x402-payment-gating","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","Base network API","pay-per-call inventory","lowpaymentfee API","product stock API"],"warnings":["No API documentation available — docs, pricing, and README pages all return only a wallet-connect prompt with no content.","No OpenAPI or JSON schema describing request body or response format for this endpoint.","The exact nature of the 'inventory' data returned is unknown; 'Premium API Access' is a generic label.","The broader platform lists many endpoints but none have documented schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/35/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/35/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 stub with only the payment challenge to go 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'0.02':119 '000':114 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':136 '20':113 '35':42 '6':126 'Base network API' 'USDC micropayment API' 'accept':104 'access':34,93,150 'actual':195 'address':135 'advertis':149 'ai/ml':67 'analyt':66 'api':63,92,143,163 'avail':223 'base':8,22,81,115,139 'base-network' 'behind':76 'bodi':202 'broader':53 'call':62 'cannot':219 'chain':133 'challeng':99 'confirm':100 'connect':172 'contain':196 'content':178 'crawl':161 'crypto':70 'data':65,194 'decim':127 'descript':189 'determin':221 'doc':162 'document':156 'dozen':57 'els':218 'endpoint':6,20,30,87,205 'exact':207 'exampl':186 'expect':203 'extrem':158 'field':199 'financ':69 'function':208 'gate':3,17,75,155 'id':41 'infer':68 'inventori':5,19,38,193 'key':144 'l2':140 'label':90 'level':213 'limit':147 'live':103 'lowpaymentfee API' 'lowpaymentfee.com':32 'materi':224 'maximum':110 'metadata':215 'micropay':78 'network':82,141 'no-api-key' 'offer':56 'on-chain':131 'openapi':182 'page':167 'part':50 'pay':10,24,60 'pay-per-cal':59 'pay-per-call inventory' 'pay-per-request':9,23 'payment':46,111,128,154 'payment-g':153 'per':11,25,61,121 'platform':54 'post':105,201 'premium':91 'price':164 'product':4,18,37,40,214 'product inventory API' 'product stock API' 'product-inventory' 'prompt':174 'protocol':47 'provid':33,96 'pure':152 'rate':146 'readm':166 'request':12,26,106,122 'request/response':185 'requir':108 'resourc':39 'return':169,211 'schema':183 'servic':73 'settl':130 'sinc':123 'someth':217 'span':64 'spars':159 'specif':86 'stock':212 'substant':177 'unit':116 'usd':120 'usdc':14,28,84,118,124 'usdc-micropayment' 'use':83,125 'util':72 'via':43 'wallet':173 'whether':209 'x402':2,16,45,77,98 'x402 inventory endpoint' 'x402-gated':1,15 'x402-payment-gating'","prices":[{"id":"ae16e9af-894f-4f13-958f-ba03a98f0c7a","listingId":"04910003-96f2-4001-b218-b4b2a9b12d61","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/35/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":"2026-04-18T18:35:01.209Z"}],"sources":[{"listingId":"04910003-96f2-4001-b218-b4b2a9b12d61","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/35/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:01.209Z","lastSeenAt":"2026-04-22T20:00:29.426Z"}],"details":{"listingId":"04910003-96f2-4001-b218-b4b2a9b12d61","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/35/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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/35/inventory"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/35/inventory"},{"claim":"Docs, API, pricing, and README pages return only a 'Connect wallet' prompt with no substantive documentation","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying product inventory data for product ID 35 via a single paid API call","Integrating pay-per-request inventory checks into automated agent workflows","Demonstrating x402 micropayment protocol usage on Base network"],"bestFor":["Agents or apps needing on-demand product inventory lookups without subscription commitments","Developers experimenting with x402 payment-gated APIs on Base","Low-volume, pay-as-you-go inventory queries"],"notFor":["High-volume inventory monitoring requiring bulk or subscription pricing","Use cases requiring detailed API documentation or guaranteed SLAs","Users who need non-crypto payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:52.029Z"},"updatedAt":"2026-04-22T20:00:29.426Z"}}