{"id":"724e5bf6-5d4a-4af5-95c5-6c202253aef4","shortId":"P3Qag8","kind":"x402","title":"x402-gated product inventory endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated product inventory endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com provides access to a product inventory resource (product ID 49) via the x402 payment protocol. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 0.02 USDC per request (20,000 base units at 6 decimals).\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that offers a variety of x402-gated APIs spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities — all priced at $0.02 per request. The platform advertises no API keys, no rate limits, and instant access; callers simply attach an x402 payment header to each request.\n\nThe specific functionality behind this particular endpoint (/api/v1/products/49/inventory) is not well-documented. The listing title is \"Premium API Access\" and the path suggests it returns inventory data for a specific product, but no request/response schema, field descriptions, or example payloads are available. The docs, pricing, and API pages on the site all render only a \"Connect wallet\" prompt with no further technical detail. Prospective callers should be aware that the actual behavior of this endpoint is unclear beyond its payment parameters.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","product-inventory","pay-per-call","json-response"],"categories":["commerce","data"],"synonyms":["product inventory API","x402 inventory endpoint","lowpaymentfee API","USDC pay-per-call","Base network API","product data endpoint"],"warnings":["No request or response schema available — actual endpoint behavior is unknown","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no technical content","The endpoint path suggests product inventory but the listing title 'Premium API Access' is generic and uninformative","No OpenAPI spec or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/49/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/49/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 (402 challenge captured) and payment parameters are clear, but there is no documentation of request/response schemas, no examples, and the docs pages are empty. The actual functionality behind 'Premium API Access' for product 49 inventory is 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'0.02':72,115 '000':77 '0x8335':65 '20':76 '2913':66 '49':42 '6':81 'Base network API' 'USDC pay-per-call' 'accept':49 'access':34,129,159 'actual':211 'advertis':120 'ai/ml':104 'analyt':103 'api':100,122,158,187 'attach':132 'avail':182 'awar':208 'base':8,22,60,78 'base-network' 'behavior':212 'behind':143 'beyond':218 'broader':89 'call':12,26 'caller':130,205 'connect':196 'contract':64 'cost':70 'data':102,108,167 'decim':82 'descript':177 'detail':203 'doc':184 'document':152 'endpoint':6,20,30,84,146,215 'exampl':179 'field':176 'financ':106 'function':142 'gate':3,17,99 'header':136 'id':41 'infer':105 'infrastructur':110 'instant':128 'inventori':5,19,38,166 'json':54 'json-response' 'key':123 'limit':126 'list':154 'lowpaymentfee API' 'lowpaymentfee.com':32,91 'maximum':69 'network':61 'offer':93 'page':188 'paramet':221 'part':86 'particular':145 'path':162 'pay':10,24 'pay-per-cal':9,23 'pay-per-call' 'payload':180 'payment':46,55,135,220 'per':11,25,74,116 'platform':90,119 'post':50 'premium':157 'price':113,185 'product':4,18,37,40,171 'product data endpoint' 'product inventory API' 'product-inventory' 'prompt':198 'prospect':204 'protocol':47 'provid':33 'rate':125 'render':193 'request':51,75,117,139 'request/response':174 'resourc':39 'return':53,165 'schema':175 'settl':57 'simpli':131 'site':191 'span':101 'specif':141,170 'suggest':163 'technic':202 'titl':155 'unclear':217 'unit':79 'usdc':14,28,63,73 'usdc-settlement' 'use':62 'util':111 'varieti':95 'via':43 'wallet':197 'web3':107 'well':151 'well-docu':150 'x402':2,16,45,98,134 'x402 inventory endpoint' 'x402-gated':1,15,97 'x402-payment'","prices":[{"id":"01b8502b-69c2-4ba2-b6ee-7e02262e5c3c","listingId":"724e5bf6-5d4a-4af5-95c5-6c202253aef4","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/49/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":"2026-04-18T18:35:19.248Z"}],"sources":[{"listingId":"724e5bf6-5d4a-4af5-95c5-6c202253aef4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/49/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:19.248Z","lastSeenAt":"2026-04-22T19:30:36.937Z"}],"details":{"listingId":"724e5bf6-5d4a-4af5-95c5-6c202253aef4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/49/inventory \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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 x402Version 1, accepting USDC on Base with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/products/49/inventory"},{"claim":"The platform advertises $0.02 per request, no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/49/inventory"}],"useCases":["Querying inventory status for a specific product via micropayment","Integrating pay-per-call product data into an agent workflow","Demonstrating x402 protocol usage on Base with USDC"],"bestFor":["Agents or apps that need on-demand product inventory lookups without API key management","Developers experimenting with x402 micropayment-gated APIs on Base","Workflows requiring low-cost, no-commitment API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Bulk inventory queries across many products (no batch endpoint documented)","Anyone needing non-USDC or non-Base payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.992Z"},"updatedAt":"2026-04-22T19:30:36.937Z"}}