{"id":"ea5ff48d-58dd-444c-9cc1-0526af6dd0a0","shortId":"FJWa4r","kind":"x402","title":"x402-gated product inventory endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated product inventory endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides access to a product inventory resource (product ID 96) behind an x402 paywall. It is part of a broader platform offering dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/products/96/inventory` is listed as \"Premium API Access\" and accepts POST requests. Payment is handled via the x402 protocol: callers receive a 402 challenge containing the payment parameters (asset, amount, payTo address) and must include a valid X-PAYMENT header to proceed. The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02. The payment is routed to address 0x1A2B…85F3 on Base mainnet using the \"exact\" scheme with a 300-second timeout.\n\nDocumentation on the site is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The endpoint name \"Premium API Access\" and the path segment \"products/96/inventory\" suggest it returns inventory data for a specific product, but the exact request body format and response structure are unknown. The platform advertises no API keys, no rate limits, and instant access as features.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","product-inventory","post-endpoint"],"categories":["commerce","data"],"synonyms":["product inventory API","x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API","inventory lookup"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema for request or response bodies","The specific functionality of 'products/96/inventory' is unclear beyond the path name","No examples of successful responses are available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/96/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/96/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 402 challenge, confirming it is operational. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the endpoint's actual functionality ('Premium API Access' for product 96 inventory) is vaguely described. The listing is essentially a stub with confirmed 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'0.02':10,24,75,146 '000':137 '0x1a2b':153 '20':136 '300':164 '402':110 '6':142 '85f3':154 '96':42 'Base network API' 'USDC micropayment API' 'accept':97 'access':34,95,211,248 'address':119,152 'advertis':239 'ai/ml':65 'amount':117,133 'analyt':64 'api':61,94,177,210,241 'asset':116 'avail':205 'base':8,22,84,138,156 'base-network' 'behind':43 'bodi':230 'broader':52 'call':60 'caller':107 'challeng':111 'connect':185 'contain':112 'content':191 'crypto':68 'data':63,221 'decim':143 'doc':175 'document':167,200 'dozen':55 'endpoint':6,20,30,88,207 'equal':145 'exact':160,228 'exampl':204 'extrem':172 'featur':250 'financ':67 'format':231 'gate':3,17 'handl':102 'header':128 'id':41 'includ':122 'infer':66 'instant':247 'inventori':5,19,38,220 'inventory lookup' 'key':242 'limit':245 'list':91 'lowpaymentfee' 'lowpaymentfee.com':32 'mainnet':157 'max':132 'must':121 'name':208 'network':85 'offer':54 'openapi':195 'page':180 'paramet':115 'part':49 'path':214 'pay':9,23,58 'pay-per-cal':57 'pay-per-call API' 'pay-per-request' 'payment':100,114,127,148 'payto':118 'paywal':46 'per':11,25,59,76 'platform':53,238 'post':98 'post-endpoint' 'premium':93,209 'price':73,176 'proceed':130 'product':4,18,37,40,225 'product inventory API' 'product-inventory' 'products/96/inventory':216 'prompt':187 'protocol':106 'provid':33 'rate':244 'readm':179 'receiv':108 'render':182 'request':12,26,77,99,229 'request/response':198 'requir':134 'resourc':39 'respons':233 'return':219 'rout':150 'schema':199 'scheme':161 'second':165 'segment':215 'servic':71 'settl':79 'site':170 'span':62 'spars':173 'spec':196 'specif':87,224 'structur':234 'suggest':217 'timeout':166 'unit':139 'unknown':236 'usag':203 'usdc':14,28,81,141 'usdc-settlement' 'use':158 'util':70 'valid':124 'via':103 'wallet':186 'x':126 'x-payment':125 'x402':2,16,45,105 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"e56af2d1-163d-4a63-84b1-5d441767e2e7","listingId":"ea5ff48d-58dd-444c-9cc1-0526af6dd0a0","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/96/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":"2026-04-18T18:35:59.194Z"}],"sources":[{"listingId":"ea5ff48d-58dd-444c-9cc1-0526af6dd0a0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/96/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:59.194Z","lastSeenAt":"2026-04-22T18:30:49.128Z"}],"details":{"listingId":"ea5ff48d-58dd-444c-9cc1-0526af6dd0a0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/96/inventory\n# Returns 402 with x402 challenge. Include X-PAYMENT header with valid payment proof to access.","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","source_url":"https://lowpaymentfee.com/api/v1/products/96/inventory"},{"claim":"The platform advertises $0.02 per 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/96/inventory"},{"claim":"The platform offers APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying product inventory data with per-request USDC micropayments","Integrating keyless, pay-as-you-go inventory checks into automated agent workflows","Accessing product stock information without subscription commitments"],"bestFor":["Agents or bots that need on-demand inventory data without API key management","Developers experimenting with x402 payment protocol integrations","Low-volume, pay-per-use inventory queries settled on Base"],"notFor":["High-volume inventory monitoring requiring bulk pricing or rate guarantees","Users who need detailed API documentation or response schema before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.222Z"},"updatedAt":"2026-04-22T18:30:49.128Z"}}