{"id":"4dadd268-733d-4cb5-b07a-119221676e91","shortId":"zWFUb2","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 78) via the x402 payment protocol. It is gated behind a per-call USDC payment on the Base network. The x402 challenge confirms the endpoint is live and accepts POST requests, returning application/json responses.\n\nThe specific endpoint `/api/v1/products/78/inventory` is listed as \"Premium API Access\" and costs up to $0.02 per request (maxAmountRequired of 20,000 base units of USDC, which has 6 decimals = $0.02). Payment is made in USDC (contract 0x8335…2913 on Base) to address 0x1A2B…85F3 using the \"exact\" payment scheme. No API keys or rate limits are advertised; access is purely payment-gated.\n\nThe broader lowpaymentfee.com platform hosts a variety of x402-gated APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto data feeds, and utility services — all priced at $0.02 per request. However, this specific listing covers only the product inventory endpoint. Documentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available, so the exact input parameters and response format for this inventory endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","product-inventory","pay-per-request","no-api-key","json-response"],"categories":["commerce","data"],"synonyms":["product inventory API","x402 inventory endpoint","USDC pay-per-call API","lowpaymentfee inventory","Base network API","402 payment required API","product data endpoint"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided; input parameters and response format are unknown","The specific product (ID 78) and what 'inventory' returns is undocumented","This endpoint path (/api/v1/products/78/inventory) does not appear in the site's listed API catalog, suggesting it may be a demo or unlisted resource"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/78/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/78/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 via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The purpose of \"product inventory\" for product 78 is entirely opaque — it could be a demo or placeholder. The docs pages are empty beyond a wallet-connect 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'0.02':91,106,171 '000':97 '0x1a2b':119 '0x8335':113 '20':96 '2913':114 '402 payment required API' '6':104 '78':42 '85f3':120 'Base network API' 'USDC pay-per-call API' 'accept':71 'access':34,86,134 'address':118 'advertis':133 'ai/ml':155 'analysi':158 'analyt':154 'api':85,127,151,193 'application/json':75 'avail':223 'base':8,22,60,98,116 'base-network' 'behind':51 'broader':141 'call':55 'challeng':64 'classif':160 'confirm':65 'connect':202 'contract':112 'cost':88 'cover':178 'data':153,163 'decim':105 'detail':209 'doc':192 'document':184,218 'embed':161 'endpoint':6,20,30,67,79,183,235 'exact':123,226 'exampl':221 'extrem':189 'feed':164 'finance/crypto':162 'format':231 'gate':3,17,50,139,150 'host':144 'howev':174 'id':41 'infer':156 'input':227 'inventori':5,19,38,182,234 'json-response' 'key':128 'limit':131 'list':82,177 'live':69 'lowpaymentfee inventory' 'lowpaymentfee.com':32,142 'made':109 'maxamountrequir':94 'network':61 'no-api-key' 'openapi':213 'page':197 'paramet':228 'pay':10,24 'pay-per-request':9,23 'payload':222 'payment':46,57,107,124,138 'payment-g':137 'per':11,25,54,92,172 'per-cal':53 'platform':143 'post':72 'premium':84 'price':169,194 'product':4,18,37,40,181 'product data endpoint' 'product inventory API' 'product-inventory' 'prompt':204 'protocol':47 'provid':33 'pure':136 'rate':130 'readm':196 'render':199 'request':12,26,73,93,173 'request/response':216 'resourc':39 'respons':76,230 'return':74 'schema':217 'scheme':125 'sentiment':157 'servic':167 'site':187 'span':152 'spars':190 'spec':214 'specif':78,176 'summar':159 'technic':208 'unit':99 'unknown':237 'usdc':14,28,56,101,111 'usdc-payment' 'use':121 'util':166 'varieti':146 'via':43 'wallet':203 'x402':2,16,45,63,149 'x402 inventory endpoint' 'x402-gated':1,15,148 'x402-payment'","prices":[{"id":"9fda36b3-0777-4a27-9ed2-243d9f2de8d4","listingId":"4dadd268-733d-4cb5-b07a-119221676e91","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/78/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":"2026-04-18T18:38:36.376Z"}],"sources":[{"listingId":"4dadd268-733d-4cb5-b07a-119221676e91","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/78/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:36.376Z","lastSeenAt":"2026-04-22T15:00:50.577Z"}],"details":{"listingId":"4dadd268-733d-4cb5-b07a-119221676e91","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/78/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 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/78/inventory"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/78/inventory"},{"claim":"All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (docs, API, pricing, README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying inventory levels for a specific product via automated agents","Integrating real-time product availability checks into commerce workflows","Agent-driven inventory monitoring with per-call micropayments"],"bestFor":["Agents needing on-demand product inventory data without API key management","Micropayment-based access to inventory information","x402-compatible clients on the Base network"],"notFor":["Bulk inventory queries requiring thousands of calls (costs add up at $0.02 each)","Users who need detailed API documentation or schema validation before integration","Non-USDC or non-Base-network payment workflows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.346Z"},"updatedAt":"2026-04-22T15:00:50.577Z"}}