{"id":"d6c7a6c9-44df-4aca-9b49-087be6204e04","shortId":"XM9Tbm","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 62) 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, infrastructure utilities, and more — all gated behind x402 micro-payments on the Base network using USDC.\n\nThe specific endpoint `/api/v1/products/62/inventory` is listed as \"Premium API Access\" and accepts POST requests. Payment is settled on-chain via USDC on Base (contract 0x8335…2913) with an exact-scheme challenge. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nDocumentation beyond the landing page 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 spec, no request/response schema documentation, and no examples of what the inventory response payload looks like. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what request body is expected or what shape the inventory data takes.","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","USDC micropayment API","Base network API","pay-per-call inventory","lowpaymentfee API","402 payment API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or schema definition; request body format and response structure are completely unknown","The endpoint path references a specific product ID (62) with no explanation of what product this represents","No examples of successful responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/62/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/62/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 there is virtually no documentation: no OpenAPI spec, no request/response schemas, no examples, and all doc pages render only 'Connect wallet'. The purpose ('Premium API Access' for product 62 inventory) is vague and the actual data returned is 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'/api/v1/products/62/inventory':91 '/docs':171 '/pricing':173 '/readme':175 '0.02':138 '000':129 '0x8335':113 '20':128 '2913':114 '402':216 '402 payment API' '6':134 '62':42 'Base network API' 'USDC micropayment API' 'accept':99 'access':34,97,151 'advertis':142 'ai/ml':67 'amount':123 'analyt':66 'api':63,96,144 'attach':154 'base':8,22,84,111,130 'base-network' 'behind':77 'beyond':163 'bodi':226 'broader':53 'call':62,126 'chain':107 'challeng':120,217 'confirm':211 'connect':181 'content':187 'contract':112 'crypto':70 'data':65,234 'decim':135 'document':162,196,220 'dozen':57 'endpoint':6,20,30,90,209 'equal':137 'exact':118 'exact-schem':117 'exampl':199 'expect':228 'extrem':168 'financ':69 'gate':3,17,76 'header':158 'id':41 'infer':68 'infrastructur':71 'instant':150 'inventori':5,19,38,203,233 'key':145 'land':165 'like':207 'limit':148 'list':93 'live':212 'look':206 'lowpaymentfee API' 'lowpaymentfee.com':32 'maximum':122 'micro':80 'micro-pay':79 'network':85 'no-api-key' 'offer':56 'on-chain':105 'openapi':191 'page':166,176 'part':50 'pay':10,24,60 'pay-per-cal':59 'pay-per-call inventory' 'pay-per-request':9,23 'payload':205 'payment':46,81,102,157 'per':11,25,61,125 'platform':54,141 'post':100 'premium':95 'product':4,18,37,40 'product inventory API' 'product-inventory' 'prompt':183 'proper':215 'protocol':47 'provid':33 'rate':147 'render':178 'request':12,26,101,161,225 'request/response':194 'requir':124 'resourc':39 'respons':204 'return':213 'schema':195 'scheme':119 'settl':104 'shape':231 'simpli':153 'span':64 'spars':169 'spec':192 'specif':89 'take':235 'unclear':223 'unit':131 'usd':139 'usdc':14,28,87,109,133 'usdc-settlement' 'use':86 'util':72 'via':43,108 'wallet':182 'without':219 'x402':2,16,45,78,156 'x402 inventory endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"56491568-6bde-4b7e-8eca-a7110b362703","listingId":"d6c7a6c9-44df-4aca-9b49-087be6204e04","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/62/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":"2026-04-18T18:36:06.438Z"}],"sources":[{"listingId":"d6c7a6c9-44df-4aca-9b49-087be6204e04","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/62/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:06.438Z","lastSeenAt":"2026-04-22T18:30:49.768Z"}],"details":{"listingId":"d6c7a6c9-44df-4aca-9b49-087be6204e04","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/62/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 challenge with x402Version 1, exact scheme, on Base network, with maxAmountRequired of 20000 base units of USDC","source_url":"https://lowpaymentfee.com/api/v1/products/62/inventory"},{"claim":"The 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 on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/62/inventory"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying product inventory data with per-request USDC micropayments","Integrating inventory checks into agent workflows without API key management","Programmatic inventory lookups settled on Base L2"],"bestFor":["Agents or bots that need on-demand inventory data without subscription commitments","Developers experimenting with x402 payment-gated APIs","Low-volume, pay-as-you-go inventory queries"],"notFor":["High-volume inventory monitoring requiring bulk pricing or subscriptions","Use cases requiring detailed API documentation or guaranteed SLAs","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.818Z"},"updatedAt":"2026-04-22T18:30:49.768Z"}}