{"id":"d2e75e24-734b-4e5b-9283-3e781ad97d59","shortId":"WENj59","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The site hosts a collection of pay-per-request APIs spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities — all priced at $0.02 per request, settled in USDC on the Base network. No API keys, rate limits, or upfront commitments are required; callers simply attach an x402 payment header to each request.\n\nThe specific resource at `/api/resource/38` is listed generically as \"Premium API Access\" with no further documentation on what data or functionality it returns. The x402 challenge confirms the endpoint is live, accepts POST requests, and requires up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, using the exact payment scheme with a 300-second timeout.\n\nDocumentation is extremely sparse. The site's /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response schema, and no description of what `/api/resource/38` actually returns. The landing page lists many other endpoints (analytics, AI, finance, utils) but does not mention `/api/resource/38` by name, so its specific purpose is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","no-api-key","no-rate-limit"],"categories":["api","crypto"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all return only a wallet-connect prompt with no content.","The specific purpose and response format of /api/resource/38 is completely unknown; the site does not list this resource path.","No OpenAPI spec or request/response schema is provided.","Cannot verify what data or service this endpoint delivers before paying."],"endpointUrl":"https://lowpaymentfee.com/api/resource/38","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/resource/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no description of what /api/resource/38 actually does. The docs pages are empty. This is effectively a stub 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'/api/resource/38':103,207,225 '/docs':177 '/pricing':179 '/readme':181 '/request':13,28 '0.02':12,27,69,143 '000':138 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':157 '20':137 '300':167 '6':148 'Base network API' 'USDC pay-per-call' 'accept':130 'access':7,22,38,110 'actual':208 'addit':192 'address':156 'ai':218 'ai/ml':58 'analyt':57,217 'api':6,21,37,54,80,109 'attach':91 'base':9,24,77,139,159 'call':4,19,151 'caller':89 'challeng':124 'collect':48 'commit':86 'confirm':125 'connect':187 'content':193 'crypto-paid endpoint' 'data':56,62,117 'decim':149 'descript':204 'document':114,170 'endpoint':32,127,216 'exact':162 'extrem':172 'financ':60,219 'function':119 'generic':106 'header':95 'host':46 'infer':59 'infrastructur':64 'key':81 'land':211 'limit':83 'list':105,213 'live':129 'lowpaymentfee' 'lowpaymentfee.com':34 'mani':214 'mention':224 'micropayment API' 'name':227 'network':78 'no-api-key' 'no-rate-limit' 'openapi':197 'page':182,212 'pay':2,17,51 'pay-per-cal':1,16 'pay-per-request':50 'payment':42,94,152,163 'per':3,18,52,70,150 'post':131 'post-endpoint' 'premium':5,20,36,108 'premium API access' 'price':67 'prompt':189 'protocol':43 'provid':35 'purpos':231 'rate':82 'render':184 'request':53,71,98,132 'request/response':200 'requir':88,134 'resourc':101 'return':121,209 'schema':201 'scheme':164 'second':168 'sent':154 'settl':72 'simpli':90 'sinc':145 'site':45,175 'span':55 'spars':173 'spec':198 'specif':100,230 'timeout':169 'unit':140 'unknown':233 'upfront':85 'usd':144 'usdc':15,30,74,142,146 'usdc-base' 'use':147,160 'util':65,220 'via':10,25,39 'wallet':188 'web3':61 'x402':11,26,41,93,123 'x402 API' 'x402-payment'","prices":[{"id":"f1e6f7a7-154b-4b36-bbe2-f2b68296f070","listingId":"d2e75e24-734b-4e5b-9283-3e781ad97d59","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/resource/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:50.048Z"}],"sources":[{"listingId":"d2e75e24-734b-4e5b-9283-3e781ad97d59","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/38","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:50.048Z","lastSeenAt":"2026-04-23T00:31:11.133Z"}],"details":{"listingId":"d2e75e24-734b-4e5b-9283-3e781ad97d59","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/38 \\\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":"Endpoint returns HTTP 402 with x402 challenge requiring 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/resource/38"},{"claim":"Site lists APIs at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/resource/38"}],"useCases":["Accessing a pay-per-call API without needing API keys or subscriptions","Making programmatic requests settled instantly in USDC on Base","Agent-driven API consumption with per-request micropayments"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","Anyone without a Base-compatible USDC wallet","High-volume consumers who need bulk pricing or subscription discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.571Z"},"updatedAt":"2026-04-23T00:31:11.133Z"}}