{"id":"44f38527-ed49-4b4f-81ce-796996ab41c8","shortId":"7KKPTY","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 73) via the x402 payment protocol. It is part of a broader platform that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated behind x402 challenges on the Base network using USDC.\n\nThe specific endpoint `/api/v1/products/73/inventory` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform advertises uniform $0.02/request pricing across all endpoints, with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the inventory data actually contains or what fields the POST body expects. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is difficult to know what payload to send or what response to expect.","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","pay-per-call inventory","USDC micropayment API","lowpaymentfee API","Base network API","product data endpoint"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request body or response format","The meaning of 'products/73/inventory' is unknown — no description of what data is returned","The platform lists many endpoints but none appear to have public documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/73/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/73/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 challenge, confirming it exists and is gated at $0.02/request in USDC on Base. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The purpose of 'product 73 inventory' is entirely opaque. This is effectively a stub 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'/request':132 '0.02':120,131 '000':109 '0x8335':114 '20':108 '2913':115 '402':204 '6':125 '73':42 'Base network API' 'USDC micropayment API' 'accept':97 'access':34,95 'across':134 'actual':187 'advertis':103,129 'ai/ml':68 'analyt':67 'api':63,94,139,155 'base':8,22,82,110,117 'base-network' 'behind':77 'bodi':194 'broader':53 'call':62 'challeng':79,102,205 'commit':147 'confirm':199 'connect':164 'contain':188 'content':170 'cost':106 'crypto':71 'data':66,186 'decim':126 'descript':181 'difficult':211 'doc':154 'document':149,208 'dozen':57 'endpoint':6,20,30,64,88,136,197 'equal':119 'exampl':178 'expect':195,222 'extrem':151 'field':191 'financ':70 'gate':3,17,76 'id':41 'infer':69 'inventori':5,19,38,185 'key':140 'know':213 'limit':143 'list':91 'live':200 'lowpaymentfee API' 'lowpaymentfee.com':32 'maximum':105 'minimum':146 'network':83 'no-api-key' 'offer':56 'openapi':174 'page':159 'part':50 'pay':10,24,60 'pay-per-cal':59 'pay-per-call inventory' 'pay-per-request':9,23 'payload':215 'payment':46 'per':11,25,61,121 'platform':54,128 'post':98,193 'premium':93 'price':133,156 'product':4,18,37,40 'product data endpoint' 'product inventory API' 'product-inventory' 'prompt':166 'proper':203 'protocol':47 'provid':33 'rate':142 'readm':158 'render':161 'request':12,26,99,122 'request/response':177 'requir':148 'resourc':39 'respons':220 'return':201 'schema':175 'send':217 'servic':74 'span':65 'spars':152 'specif':87 'substant':169 'uniform':130 'unit':111 'usdc':14,28,85,113,123 'usdc-settlement' 'use':84,124 'util':73 'via':43 'wallet':165 'without':207 'x402':2,16,45,78,101 'x402 inventory endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"f0d379ec-8364-4ebf-af0c-c12be48656b5","listingId":"44f38527-ed49-4b4f-81ce-796996ab41c8","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/73/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":"2026-04-18T18:37:51.244Z"}],"sources":[{"listingId":"44f38527-ed49-4b4f-81ce-796996ab41c8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/73/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:51.244Z","lastSeenAt":"2026-04-22T16:30:46.580Z"}],"details":{"listingId":"44f38527-ed49-4b4f-81ce-796996ab41c8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/73/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","source_url":"https://lowpaymentfee.com/api/v1/products/73/inventory"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/73/inventory"},{"claim":"Documentation pages (docs, API, pricing, README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying product inventory data for product ID 73 via a single paid API call","Integrating pay-per-request inventory checks into an agent workflow without managing API keys","Demonstrating x402 payment protocol integration on Base with USDC"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that need keyless, pay-per-call access to inventory data","Projects already using USDC on Base that want frictionless API payments"],"notFor":["Production inventory management requiring documented schemas and SLAs","Users who need free or subscription-based API access","Anyone requiring detailed documentation or response guarantees before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.729Z"},"updatedAt":"2026-04-22T16:30:46.580Z"}}