{"id":"5a9358d2-b45c-4daf-99c2-b29cbabd012f","shortId":"RV2mRD","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 92) 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 micropayments on the Base network using USDC.\n\nThe specific endpoint `/api/v1/products/92/inventory` is listed as \"Premium API Access\" and accepts HTTP 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 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 x402 challenge), but without documentation it is difficult to know what data is returned or what input parameters are accepted.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","product-inventory","pay-per-request","no-api-key"],"categories":["commerce","data"],"synonyms":["product inventory API","inventory lookup","x402 inventory","micropayment API","USDC API","Base network API","lowpaymentfee"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or JSON schema describing request parameters or response format","The endpoint path suggests product inventory data but the actual payload structure is unknown","The listing title 'Premium API Access' is generic and does not describe the endpoint's function"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/92/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/92/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 accepts payments on Base in USDC at $0.02 per call. However, there is no OpenAPI schema, no documentation, no request/response examples, and no description of what data the endpoint actually returns. The listing title 'Premium API Access' is generic and uninformative. Effectively a 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'/api/v1/products/92/inventory':89 '/docs':159 '/pricing':161 '/readme':163 '0.02':125,135 '000':120 '0x8335':112 '20':119 '2913':113 '402':209 '6':128 '92':42 'Base network API' 'USDC API' 'accept':97,229 'access':34,95 'across':138 'actual':192 'advertis':132 'ai/ml':68 'amount':117 'analyt':67 'api':63,94,144 'base':8,22,82,108,121 'base-network' 'behind':77 'bodi':199 'broader':53 'call':62 'chain':106 'challeng':211 'commit':152 'confirm':204 'connect':169 'contain':193 'content':175 'contract':111 'crypto':71 'data':66,191,221 'decim':129 'descript':186 'difficult':217 'document':154,214 'dozen':57 'endpoint':6,20,30,64,88,141,202 'equal':124 'exampl':183 'expect':200 'extrem':156 'field':196 'financ':70 'flat':134 'gate':3,17,76 'http':98 'id':41 'infer':69 'input':226 'inventori':5,19,38,190 'inventory lookup' 'key':145 'know':219 'limit':148 'list':91 'live':205 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':116 'micropay':79 'micropayment API' 'minimum':151 'network':83 'no-api-key' 'offer':56 'on-chain':104 'openapi':179 'page':164 'paramet':227 'part':50 'pay':10,24,60 'pay-per-cal':59 'pay-per-request':9,23 'payment':46,101 'per':11,25,61,136 'platform':54,131 'post':99,198 'premium':93 'product':4,18,37,40 'product inventory API' 'product-inventory' 'prompt':171 'proper':208 'protocol':47 'provid':33 'rate':147 'render':166 'request':12,26,100,137 'request/response':182 'requir':153 'resourc':39 'return':206,223 'schema':180 'servic':74 'settl':103 'span':65 'spars':157 'specif':87 'substant':174 'unit':122 'usdc':14,28,85,110,126 'usdc-settlement' 'use':84,109,127 'util':73 'via':43 'wallet':170 'without':213 'x402':2,16,45,78,210 'x402 inventory' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"cb9320f1-25d4-43e6-ade9-0be1c405df5e","listingId":"5a9358d2-b45c-4daf-99c2-b29cbabd012f","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/92/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":"2026-04-18T18:34:45.525Z"}],"sources":[{"listingId":"5a9358d2-b45c-4daf-99c2-b29cbabd012f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/92/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:45.525Z","lastSeenAt":"2026-04-22T20:00:28.709Z"}],"details":{"listingId":"5a9358d2-b45c-4daf-99c2-b29cbabd012f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/92/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/92/inventory"},{"claim":"The platform charges $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/products/92/inventory"}],"useCases":["Querying product inventory data for product ID 92 via a single paid API call","Integrating pay-per-use inventory checks into automated agent workflows","Demonstrating x402 micropayment protocol usage on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing on-demand inventory data without API key registration","Use cases requiring per-call billing with no subscription commitment"],"notFor":["Production inventory management requiring documented schemas and SLAs","Users who need detailed API documentation or request/response examples before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:17:25.176Z"},"updatedAt":"2026-04-22T20:00:28.709Z"}}