{"id":"9e9e0c29-aa9d-475d-b716-08f9b0310532","shortId":"9Lq2XE","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 19) 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 micropayments on the Base network using USDC.\n\nThe specific endpoint `/api/v1/products/19/inventory` is listed as \"Premium API Access\" by the provider. The x402 challenge confirms it is live, accepting POST requests, and requires a maximum payment of 20,000 base units of USDC (0.02 USD) per call. Payment is settled on-chain on Base to the provider's address. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned 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 endpoint actually returns. The endpoint name and product ID suggest it retrieves inventory data for a specific product, but the exact schema and semantics are unknown.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","product-inventory","pay-per-request","no-api-key"],"categories":["commerce","data"],"synonyms":["product inventory API","x402 inventory endpoint","lowpaymentfee API","USDC micropayment API","Base network API","pay-per-call inventory"],"warnings":["No API documentation available — docs, pricing, and README pages all render only a wallet-connect prompt","No OpenAPI or request/response schema provided for this endpoint","The exact data returned by /api/v1/products/19/inventory is unknown","Provider site appears to be a generic x402 demo platform with many endpoints but no substantive documentation for any of them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/19/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/19/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 via a valid x402 402 challenge, and pricing is clear ($0.02 USDC per call). However, there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality of this specific inventory endpoint is undocumented. The crawled pages beyond the homepage returned no useful 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'0.02':120 '000':115 '19':42 '20':114 'Base network API' 'USDC micropayment API' 'accept':105 'access':34,94,148 'actual':202 'address':136 'advertis':139 'ai/ml':67 'analyt':66 'api':63,93,141,170 'attach':151 'base':8,22,81,116,131 'base-network' 'behind':76 'broader':53 'call':62,123 'caller':149 'chain':129 'challeng':100 'confirm':101 'connect':179 'content':185 'crawl':168 'crypto':70 'data':65,214 'descript':196 'doc':169 'document':163 'dozen':57 'endpoint':6,20,30,87,201,205 'exact':221 'exampl':193 'extrem':165 'financ':69 'gate':3,17,75 'header':156 'id':41,209 'infer':68 'instant':147 'inventori':5,19,38,200,213 'key':142 'limit':145 'list':90 'live':104 'lowpaymentfee API' 'lowpaymentfee.com':32 'maximum':111 'micropay':78 'name':206 'network':82 'no-api-key' 'offer':56 'on-chain':127 'openapi':189 'page':174 'part':50 'pay':10,24,60 'pay-per-cal':59 'pay-per-call inventory' 'pay-per-request':9,23 'payment':46,112,124,155,161 'per':11,25,61,122 'platform':54,138 'post':106 'premium':92 'price':171 'product':4,18,37,40,208,218 'product inventory API' 'product-inventory' 'prompt':181 'proof':162 'protocol':47 'provid':33,97,134 'rate':144 'readm':173 'request':12,26,107 'request/response':192 'requir':109 'resourc':39 'retriev':212 'return':176,203 'schema':190,222 'semant':224 'servic':73 'settl':126 'simpli':150 'span':64 'spars':166 'specif':86,217 'substant':184 'suggest':210 'unit':117 'unknown':226 'usd':121 'usdc':14,28,84,119 'usdc-micropayment' 'use':83 'util':72 'valid':159 'via':43 'wallet':180 'x':154 'x-payment':153 'x402':2,16,45,77,99,160 'x402 inventory endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"906c65da-eff2-435b-8777-86d0bdeb20e7","listingId":"9e9e0c29-aa9d-475d-b716-08f9b0310532","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/19/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":"2026-04-18T18:37:53.589Z"}],"sources":[{"listingId":"9e9e0c29-aa9d-475d-b716-08f9b0310532","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/19/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:53.589Z","lastSeenAt":"2026-04-22T15:00:47.251Z"}],"details":{"listingId":"9e9e0c29-aa9d-475d-b716-08f9b0310532","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/19/inventory \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns HTTP 402 with an x402 challenge requiring 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/19/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 address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/19/inventory"}],"useCases":["Querying product inventory data with per-request USDC micropayments","Integrating x402-compatible agents with on-chain payment for data access","Programmatic inventory lookups without API key management"],"bestFor":["Agents or bots that support x402 payment protocol on Base","Developers wanting keyless, pay-per-use API access","Micropayment-based data retrieval workflows"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume batch inventory queries where per-call fees add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.613Z"},"updatedAt":"2026-04-22T15:00:47.251Z"}}