{"id":"e4e0fef5-0171-47ac-a6c4-2b184e4532b3","shortId":"7uZ6GP","kind":"x402","title":"x402-gated product inventory endpoint on Base, paid per-request in USDC.","tagline":"x402-gated product inventory endpoint on Base, paid per-request in USDC.","description":"This endpoint at lowpaymentfee.com provides access to a product inventory resource (product ID 30) behind an x402 paywall. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 \"exact\" scheme.\n\nThe specific endpoint `/api/v1/products/30/inventory` is listed under the provider's umbrella as \"Premium API Access.\" The broader lowpaymentfee.com platform advertises a suite of APIs spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and instant access. However, this particular endpoint's x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 — consistent with the site-wide pricing.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no description of what the inventory payload actually contains. The endpoint is confirmed live (402 challenge captured), but without documentation or example responses, it is difficult to know exactly what data is returned.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","product-inventory","json-response","per-request-billing","no-api-key"],"categories":["commerce","data"],"synonyms":["product inventory API","x402 inventory endpoint","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API","product data endpoint"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","The specific data returned by the inventory endpoint is unknown","Only product ID 30 is referenced; unclear if other product IDs are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/30/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/30/inventory","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of the 'product inventory' data is unexplained, making this effectively a stub 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'/api/v1/products/30/inventory':74 '/docs':154 '/pricing':156 '/readme':158 '0.02':107,141 '000':132 '0x8335':64 '20':131 '2913':65 '30':42 '402':194 '6':137 'Base network API' 'USDC micropayment API' 'accept':48 'access':34,85,119 'actual':187 'advertis':90,127 'ai/ml':98 'analyt':97 'api':84,94,112 'base':8,22,59,133 'base-network' 'behind':43 'broader':87 'captur':196 'challeng':126,195 'confirm':192 'connect':164 'consist':142 'contain':188 'content':170 'contract':63 'data':96,210 'decim':138 'descript':181 'difficult':205 'document':149,199 'endpoint':6,20,30,73,123,190 'equal':140 'exact':69,208 'exampl':201 'extrem':151 'finance/web3':100 'gate':3,17 'howev':120 'id':41 'infer':99 'infrastructur':102 'instant':118 'inventori':5,19,38,185 'json':53 'json-response' 'key':113 'know':207 'limit':116 'list':76 'live':193 'lowpaymentfee' 'lowpaymentfee.com':32,88 'maxamountrequir':129 'network':60 'no-api-key' 'openapi':174 'page':159 'paid':9,23 'particular':122 'pay-per-call API' 'payload':186 'payment':54 'paywal':46 'per':11,25,108 'per-request':10,24 'per-request-billing' 'platform':89 'post':49 'premium':83 'price':105,148 'product':4,18,37,40 'product data endpoint' 'product inventory API' 'product-inventory' 'prompt':166 'provid':33,79 'rate':115 'render':161 'request':12,26,50,109 'request/response':177 'resourc':39 'respons':202 'return':52,212 'schema':178 'scheme':70 'settl':56 'site':146 'site-wid':145 'span':95 'spars':152 'spec':175 'specif':72 'suit':92 'umbrella':81 'unit':134 'usdc':14,28,62,136 'usdc-settlement' 'use':61 'util':103 'via':66 'wallet':165 'wide':147 'without':198 'x402':2,16,45,68,125 'x402 inventory endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"a55e434f-4398-4bdd-b641-c1c75b407b37","listingId":"e4e0fef5-0171-47ac-a6c4-2b184e4532b3","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/30/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":"2026-04-18T18:36:55.940Z"}],"sources":[{"listingId":"e4e0fef5-0171-47ac-a6c4-2b184e4532b3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/30/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:55.940Z","lastSeenAt":"2026-04-22T16:30:42.449Z"}],"details":{"listingId":"e4e0fef5-0171-47ac-a6c4-2b184e4532b3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/30/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/30/inventory"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/products/30/inventory"}],"useCases":["Querying real-time product inventory data for product ID 30","Integrating pay-per-request inventory checks into automated agent workflows","Demonstrating x402 protocol payment flows on Base"],"bestFor":["Agents or bots that need on-demand inventory lookups without subscription commitments","Developers experimenting with x402 micropayment-gated APIs","Workflows requiring keyless, permissionless API access on Base"],"notFor":["Bulk inventory queries across many products (only product 30 is exposed at this path)","Users who need detailed API documentation or guaranteed SLAs","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.319Z"},"updatedAt":"2026-04-22T16:30:42.449Z"}}