{"id":"007ff14c-9f69-4fbb-a03f-2ff76927e590","shortId":"LY6QTc","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 12) 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 & machine learning, finance & Web3, 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 of this particular endpoint — product inventory lookup or management — is not well-documented. The crawled site pages (docs, pricing, README) all returned only a \"Connect wallet\" prompt with no additional technical documentation. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the lack of documentation means callers will need to experiment to discover the expected request body and response format.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","product-inventory","pay-per-request","no-api-key","json-response"],"categories":["commerce","data"],"synonyms":["product inventory API","x402 inventory endpoint","pay-per-call inventory","USDC API access","Base network API","lowpaymentfee inventory","402 payment API"],"warnings":["No API documentation available — docs, pricing, and README pages all return only a 'Connect wallet' prompt with no technical content.","No OpenAPI or JSON schema for request or response bodies; callers must discover the interface by experimentation.","The specific purpose of '/api/v1/products/12/inventory' is unclear — 'Premium API Access' is a generic label used across the platform.","No information on uptime, SLAs, or data freshness guarantees."],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/12/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/12/inventory","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The endpoint's actual functionality (what it returns, what input it expects) is entirely 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'000':77 '0x8335':65 '12':42 '20':76 '2913':66 '402':197 '402 payment API' '6':81 'Base network API' 'USDC API access' 'accept':49 'access':34,129 'addit':173 'advertis':120 'ai':104 'analyt':103 'api':100,122 'attach':132 'avail':188 'base':8,22,60,78 'base-network' 'bodi':216 'broader':89 'call':12,26 'caller':130,206 'challeng':199 'confirm':192 'connect':168 'contract':64 'cost':70 'crawl':158 'data':102 'decim':82 'discov':212 'doc':161 'document':156,175,204 'endpoint':6,20,30,84,146,190 'exampl':186 'expect':214 'experi':210 'financ':107 'format':219 'function':142 'gate':3,17,99 'header':136 'id':41 'infrastructur':110 'instant':128 'inventori':5,19,38,148 'json':54 'json-response' 'key':123 'lack':202 'learn':106 'limit':126 'live':193 'lookup':149 'lowpaymentfee inventory' 'lowpaymentfee.com':32,91 'machin':105 'manag':151 'maximum':69 'mean':205 'need':208 'network':61 'no-api-key' 'offer':93 'openapi':179 'page':160 'part':86 'particular':145 'pay':10,24 'pay-per-cal':9,23 'pay-per-call inventory' 'pay-per-request' 'payload':187 'payment':46,55,135 'per':11,25,74,116 'platform':90,119 'post':50 'price':113,162 'product':4,18,37,40,147 'product inventory API' 'product-inventory' 'prompt':170 'proper':196 'protocol':47 'provid':33 'rate':125 'readm':163 'request':51,75,117,139,215 'request/response':182 'resourc':39 'respons':218 'return':53,165,194 'schema':183 'settl':57 'simpli':131 'site':159 'span':101 'spec':180 'specif':141 'technic':174 'unit':79 'usdc':14,28,63,73 'usdc-settlement' 'use':62 'util':111 'varieti':95 'via':43 'wallet':169 'web3':108 'well':155 'well-docu':154 'x402':2,16,45,98,134,198 'x402 inventory endpoint' 'x402-gated':1,15,97 'x402-payment'","prices":[{"id":"1fecd6b0-6a71-4999-a347-c2891c97e767","listingId":"007ff14c-9f69-4fbb-a03f-2ff76927e590","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/12/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":"2026-04-18T18:35:42.165Z"}],"sources":[{"listingId":"007ff14c-9f69-4fbb-a03f-2ff76927e590","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/12/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:42.165Z","lastSeenAt":"2026-04-22T18:30:47.699Z"}],"details":{"listingId":"007ff14c-9f69-4fbb-a03f-2ff76927e590","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/12/inventory \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","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 in USDC on Base network.","source_url":"https://lowpaymentfee.com/api/v1/products/12/inventory"},{"claim":"The platform prices all APIs at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/products/12/inventory"}],"useCases":["Querying product inventory data for product ID 12 via a single paid API call","Integrating pay-per-use inventory checks into an automated agent workflow","Demonstrating x402 protocol payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol integrations","Agents needing on-demand inventory data without API key registration","Low-volume, pay-as-you-go inventory queries"],"notFor":["High-volume inventory management requiring bulk operations or subscriptions","Use cases requiring detailed API documentation or guaranteed SLAs","Users who need non-USDC or non-Base-network payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.917Z"},"updatedAt":"2026-04-22T18:30:47.699Z"}}