{"id":"83fd4898-2f21-4dec-a32e-b82c4ecc3a65","shortId":"uZZQ6Q","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 \"Premium API Access\" resource at the path `/api/v1/products/26/inventory`. It is part of a broader platform (lowpaymentfee.com) that offers a variety of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all settled on the Base network using USDC.\n\nThe specific endpoint returns product inventory data (product ID 26) via HTTP POST. Payment is handled through the x402 protocol: callers receive a 402 challenge with payment parameters, settle the micro-payment in USDC on Base, and then receive the JSON response. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. The platform advertises no API keys, no rate limits, and instant access.\n\nDocumentation on the site is extremely thin — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the inventory data actually contains. The endpoint is confirmed live (returns a valid x402 challenge), but the lack of documentation makes it difficult to know what fields to send in the POST body or what shape the response takes.","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","Base network API","pay-per-call inventory","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — request body and response shape are unknown.","All documentation pages (docs, pricing, README, API) render only 'Connect wallet' with no usable content.","The specific meaning of 'products/26/inventory' is undocumented; it is unclear what inventory data is returned.","Cannot verify actual response content without making a paid request."],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/26/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/26/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 there is essentially no documentation: no OpenAPI schema, no request/response examples, no description of what 'products/26/inventory' actually returns. The docs, pricing, and README pages are all blank beyond a wallet-connect prompt. The listing is effectively a 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'0.02':144 '000':135 '20':134 '26':93 '402':107 '6':140 'Base network API' 'USDC micropayment API' 'access':34,39,157 'actual':199 'advertis':148 'ai/ml':69 'amount':129 'analyt':68 'api':38,65,150,168 'base':8,22,80,120,136 'base-network' 'bodi':228 'broader':50 'call':64,132 'caller':104 'challeng':108,210 'confirm':204 'connect':176 'contain':200 'content':182 'crypto':72 'data':67,90,198 'decim':141 'descript':193 'difficult':218 'doc':166 'document':158,215 'endpoint':6,20,30,86,202 'equal':143 'exampl':190 'extrem':163 'field':222 'financ':71 'gate':3,17 'handl':99 'http':95 'id':92 'infer':70 'instant':156 'inventori':5,19,89,197 'json':125 'key':151 'know':220 'lack':213 'limit':154 'live':205 'lowpaymentfee' 'lowpaymentfee.com':32,52 'make':216 'maximum':128 'micro':115 'micro-pay':114 'network':81 'no-api-key' 'offer':54 'openapi':186 'page':171 'paramet':111 'part':47 'path':43 'pay':10,24,62 'pay-per-cal':61 'pay-per-call inventory' 'pay-per-request':9,23 'payment':97,110,116 'per':11,25,63,131 'platform':51,147 'post':96,227 'premium':37 'price':167 'product':4,18,88,91 'product inventory API' 'product-inventory' 'prompt':178 'protocol':60,103 'provid':33 'rate':153 'readm':170 'receiv':105,123 'render':173 'request':12,26 'request/response':189 'requir':130 'resourc':40 'respons':126,233 'return':87,206 'schema':187 'send':224 'servic':75 'settl':77,112 'shape':231 'site':161 'span':66 'specif':85 'take':234 'thin':164 'unit':137 'usd':145 'usdc':14,28,83,118,139 'usdc-settlement' 'use':82 'util':74 'valid':208 'varieti':56 'via':94 'wallet':177 'x402':2,16,59,102,209 'x402 inventory endpoint' 'x402-gated':1,15 'x402-payment' 'x402-protocol':58","prices":[{"id":"a55875e8-ac7d-4be6-b348-5b9fe5b7c443","listingId":"83fd4898-2f21-4dec-a32e-b82c4ecc3a65","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/26/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":"2026-04-18T18:35:15.617Z"}],"sources":[{"listingId":"83fd4898-2f21-4dec-a32e-b82c4ecc3a65","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/26/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:15.617Z","lastSeenAt":"2026-04-22T20:00:30.075Z"}],"details":{"listingId":"83fd4898-2f21-4dec-a32e-b82c4ecc3a65","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/26/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/26/inventory"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/products/26/inventory"}],"useCases":["Querying product inventory data without traditional API key registration","Programmatic inventory checks settled via USDC micropayments","Agent-driven commerce workflows that need on-demand inventory lookups"],"bestFor":["Developers or agents who want keyless, pay-per-call inventory access","Crypto-native applications already operating on Base","Scenarios requiring low-friction API access without subscription commitments"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume inventory polling where $0.02/request adds up quickly","Non-crypto workflows that cannot settle payments on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:51.184Z"},"updatedAt":"2026-04-22T20:00:30.075Z"}}