{"id":"f7445a6e-7ba7-4d88-87d7-84a04b4b7c77","shortId":"nzSEp5","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":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/resource/28` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe broader lowpaymentfee.com platform advertises endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02/request pricing. However, this specific listing covers only `/api/resource/28`, whose exact functionality is not documented beyond the generic \"Premium API Access\" label.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is confirmed live (returns a valid 402 challenge), but without knowing what data or service `/api/resource/28` actually provides, callers will need to experiment or contact the provider.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api","payment"],"synonyms":["x402 API","micropayment API","pay-per-call","USDC API","Base network API","lowpaymentfee","premium API"],"warnings":["The exact functionality of /api/resource/28 is undocumented — 'Premium API Access' is the only description available.","All documentation pages (/docs, /pricing, /README, /api) return only a 'Connect wallet' prompt with no technical content.","No OpenAPI spec, request schema, or response schema is available.","No usage examples or sample responses exist in the crawled material."],"endpointUrl":"https://lowpaymentfee.com/api/resource/28","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/28","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 and clear pricing ($0.02 USDC on Base). However, there is no documentation of what /api/resource/28 actually does, no request/response schema, no examples, and the docs pages are empty. The listing is essentially a stub with verified liveness and pricing but unknown 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'/api/resource/28':56,171,243 '/docs':190 '/pricing':192 '/readme':194 '/request':13,28,163 '0.02':12,27,87,162 '000':82 '0x8335':72 '20':81 '2913':73 '402':234 '6':92 'Base network API' 'USDC API' 'accept':63 'access':7,22,42,61,183 'across':120 'actual':244 'advertis':118 'ai':130 'amount':79 'analysi':134 'analyt':124 'api':6,21,40,60,95,182 'attach':106 'avail':221 'base':9,24,50,75,83 'base-network' 'beyond':178 'broader':115 'call':4,19 'caller':104,246 'categori':122 'challeng':235 'classif':137 'collect':34 'commit':101 'confirm':229 'connect':200 'contact':252 'contract':71 'convers':154 'cover':169 'crawl':224 'data':123,127,240 'decim':93 'detail':207 'document':177,185,216 'embed':138 'endpoint':41,54,119,158,227 'equal':86 'estim':148 'exact':173 'exampl':220 'exchang':143 'experi':250 'export':128 'extrem':187 'feed':142 'financ':139 'four':121 'function':174 'gas':147 'generat':155 'generic':180 'geocod':152 'header':110 'host':32 'howev':165 'infrastructur':150 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'x402 API' 'x402-payment'","prices":[{"id":"4bf1e15f-3b89-4f50-8b3b-2420edbb520f","listingId":"f7445a6e-7ba7-4d88-87d7-84a04b4b7c77","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/28","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:57.108Z"}],"sources":[{"listingId":"f7445a6e-7ba7-4d88-87d7-84a04b4b7c77","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/28","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:57.108Z","lastSeenAt":"2026-04-22T23:00:59.798Z"}],"details":{"listingId":"f7445a6e-7ba7-4d88-87d7-84a04b4b7c77","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/28 \\\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 a valid x402 402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/resource/28"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/resource/28"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","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 access settled on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents that can attach x402 payment headers autonomously","Users who want no-signup, no-rate-limit API access at $0.02/call"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who need bulk pricing or subscription discounts","Anyone unable to settle payments in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.308Z"},"updatedAt":"2026-04-22T23:00:59.798Z"}}