{"id":"74c8413c-e14a-44fc-8a95-eb38b83da147","shortId":"mBdSmd","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 56) via the x402 payment protocol. It is part of a broader platform that offers dozens of pay-per-call APIs 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/56/inventory` is listed as \"Premium API Access\" and accepts POST requests. Payment is settled on-chain on Base using USDC (contract 0x8335…2913) with a maximum amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The platform advertises a flat $0.02 per request across all its endpoints, with no API keys, no rate limits, and instant access.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further 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 x402 challenge), but without documentation it is unclear what payload to send or what response structure 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 gated API","Base network API","lowpaymentfee","micropayment API"],"warnings":["No API documentation available — all doc pages render only 'Connect wallet'","No OpenAPI or JSON schema describing request body or response format","Purpose of 'Premium API Access' / product 56 inventory is undocumented","No request or response examples available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/56/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/56/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 with a valid x402 402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what data the inventory endpoint actually returns. The listing is effectively a 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'0.02':123,133 '000':118 '0x8335':110 '20':117 '2913':111 '402':205 '56':42 '6':126 'Base network API' 'USDC gated API' 'accept':96 'access':34,94,149 'across':136 'actual':188 'advertis':130 'ai/ml':67 'amount':115 'analyt':66 'api':63,93,142,156 'base':8,22,81,106,119 'base-network' 'behind':76 'bodi':195 'broader':53 'call':62 'chain':104 'challeng':78,207 'confirm':200 'connect':165 'contain':189 'content':171 'contract':109 'crypto':70 'data':65,187 'decim':127 'descript':182 'doc':155 'document':150,210 'dozen':57 'endpoint':6,20,30,87,139,198 'equal':122 'exampl':179 'expect':196,223 'extrem':152 'field':192 'financ':69 'flat':132 'gate':3,17,75 'id':41 'infer':68 'instant':148 'inventori':5,19,38,186 'key':143 'limit':146 'list':90 'live':201 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':114 'micropayment API' 'network':82 'no-api-key' 'offer':56 'on-chain':102 'openapi':175 'page':160 'part':50 'pay':10,24,60 'pay-per-cal':59 'pay-per-call inventory' 'pay-per-request':9,23 'payload':215 'payment':46,99 'per':11,25,61,134 'platform':54,129 'post':97,194 'premium':92 'price':157 'product':4,18,37,40 'product inventory API' 'product-inventory' 'prompt':167 'proper':204 'protocol':47 'provid':33 'rate':145 'readm':159 'render':162 'request':12,26,98,135 'request/response':178 'resourc':39 'respons':220 'return':202 'schema':176 'send':217 'servic':73 'settl':101 'span':64 'spars':153 'specif':86 'structur':221 'unclear':213 'unit':120 'usdc':14,28,84,108,124 'usdc-settlement' 'use':83,107,125 'util':72 'via':43 'wallet':166 'without':209 'x402':2,16,45,77,206 'x402 inventory endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"bb022777-acb0-4a5d-bbf8-f971222f69b9","listingId":"74c8413c-e14a-44fc-8a95-eb38b83da147","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/56/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":"2026-04-18T18:36:28.866Z"}],"sources":[{"listingId":"74c8413c-e14a-44fc-8a95-eb38b83da147","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/56/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:28.866Z","lastSeenAt":"2026-04-22T16:30:40.633Z"}],"details":{"listingId":"74c8413c-e14a-44fc-8a95-eb38b83da147","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/56/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 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/56/inventory"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/products/56/inventory"}],"useCases":["Querying product inventory data for product ID 56 via a single paid API call","Integrating pay-per-request inventory checks into an agent workflow without managing API keys","Demonstrating x402 protocol usage for on-chain micropayments on Base"],"bestFor":["Developers experimenting with x402 payment protocol integrations","Agents that need keyless, pay-per-call access to inventory data","Projects already using USDC on Base that want frictionless API access"],"notFor":["Production inventory management requiring documented schemas and SLAs","Users who need detailed API documentation or request/response examples before integrating","High-volume use cases where $0.02 per request adds up without bulk pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.75Z"},"updatedAt":"2026-04-22T16:30:40.633Z"}}