{"id":"f682fe60-f23e-4671-8a0a-9af6368e9841","shortId":"cmHSLE","kind":"x402","title":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","tagline":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" at the path /api/v1/products/9. It is part of a broader platform offering multiple API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities — all priced at $0.02 per request and payable via USDC on the Base network using the x402 protocol.\n\nThe specific functionality behind /api/v1/products/9 is not documented in the crawled material; the endpoint is labeled generically as \"Premium API Access\" without further detail on what data or service it returns. The platform advertises no API keys, no rate limits, and instant access — payment is handled entirely through the x402 payment challenge (HTTP 402) with USDC on Base. The x402 challenge confirms the endpoint is live, accepting POST requests, with a max amount of 20,000 base units of USDC (i.e., $0.02 given 6 decimals).\n\nDocumentation on the site is extremely sparse: the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. Without further documentation or an OpenAPI spec, the exact request format, parameters, and response schema for this particular endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","http-post"],"categories":["general","api-marketplace"],"synonyms":["premium API","lowpaymentfee","x402 API","USDC API access","Base network API","pay-per-call API","micropayment API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all return only a 'Connect wallet' prompt","The specific functionality of /api/v1/products/9 ('Premium API Access') is not described anywhere in the crawled content","No OpenAPI spec or request/response schema available","No examples of successful responses found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/9","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/9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documentation beyond a wallet-connect prompt, no request/response schema, and the specific functionality of /api/v1/products/9 is entirely undescribed. This is effectively a stub 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'/api/v1/products/9':42,87 '/call':13,28 '/docs':176 '/pricing':178 '/readme':180 '0.02':12,27,68,164 '000':158 '20':157 '402':136 '6':166 'Base network API' 'USDC API access' 'accept':149 'access':7,22,38,103,125 'advertis':116 'ai':57 'amount':155 'analyt':56 'api':6,21,37,52,102,118 'base':9,24,77,140,159 'behind':86 'broader':48 'categori':53 'challeng':134,143 'confirm':144 'connect':186 'content':192 'crawl':93 'data':55,109 'decim':167 'detail':106 'document':90,168,195 'endpoint':32,96,146,211 'entir':129 'exact':201 'extrem':173 'financ':60 'format':203 'function':85 'generic':99 'given':165 'handl':128 'http':135 'http-post' 'i.e':163 'includ':54 'infrastructur':63 'instant':124 'key':119 'label':98 'learn':59 'limit':122 'live':148 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':58 'materi':94 'max':154 'micropayment API' 'multipl':51 'network':78 'no-api-key' 'offer':50 'openapi':198 'page':181 'paramet':204 'part':45 'particular':210 'path':41 'pay':2,17 'pay-per-call API' 'pay-per-request':1,16 'payabl':72 'payment':126,133 'per':3,18,69 'platform':49,115 'post':150 'premium':5,20,36,101 'premium API' 'price':66 'prompt':188 'protocol':82 'provid':35 'rate':121 'remain':212 'render':183 'request':4,19,70,151,202 'respons':206 'return':113 'schema':207 'servic':111 'site':171 'spars':174 'spec':199 'specif':84 'substant':191 'unit':160 'unknown':213 'usdc':15,30,74,138,162 'usdc-base' 'use':79 'util':64 'via':10,25,73 'wallet':187 'web3':61 'without':104,193 'x402':11,26,81,132,142 'x402 API' 'x402-payment'","prices":[{"id":"548912de-d9f8-40e3-bc2d-a241c74b67be","listingId":"f682fe60-f23e-4671-8a0a-9af6368e9841","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/9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:20.913Z"}],"sources":[{"listingId":"f682fe60-f23e-4671-8a0a-9af6368e9841","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/9","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:20.913Z","lastSeenAt":"2026-04-22T13:30:30.719Z"}],"details":{"listingId":"f682fe60-f23e-4671-8a0a-9af6368e9841","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/9 \\\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 maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/9"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/9"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API resource with per-call USDC micropayments","Agent-driven workflows that need keyless, on-demand API calls settled on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC micropayments on Base","Use cases requiring keyless, no-signup API access"],"notFor":["Users who need detailed documentation or guaranteed SLAs","Anyone without a Base-compatible USDC wallet","High-volume batch workloads where $0.02/request adds up quickly"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.086Z"},"updatedAt":"2026-04-22T13:30:30.719Z"}}