{"id":"eac8977f-7773-4979-a38b-69505c8a0ea6","shortId":"tBGq5H","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com is part of a suite of x402-protocol pay-per-call APIs hosted on the Base network. The specific resource `/api/v1/policies/28` is labeled \"Premium API Access\" and accepts POST requests gated by an x402 payment challenge. Payment is settled in USDC (contract 0x8335…2913 on Base) at a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys, subscriptions, or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform offers 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 endpoints are listed at the same $0.02/request price point.\n\nHowever, the specific functionality behind `/api/v1/policies/28` is not documented beyond the generic \"Premium API Access\" label. There is no OpenAPI schema, no request/response examples, and the crawled docs, pricing, and README pages all returned only a \"Connect wallet\" stub with no substantive content. Without knowing what data or service this particular endpoint returns, callers should treat it as an opaque paid resource until further documentation is available.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","post-endpoint","no-api-key","no-rate-limit"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["The specific functionality of /api/v1/policies/28 is undocumented — the label 'Premium API Access' gives no indication of what data or service is returned.","All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' stub with no substantive content.","No OpenAPI spec, no request body schema, and no response schema are available.","No information about uptime, SLAs, or data freshness is provided."],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/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/v1/policies/28","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation of what the endpoint actually does, no OpenAPI schema, no request/response examples, and the docs/pricing/README pages are all empty stubs. The 'Premium API Access' label is entirely 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'/request':172 '0.02':10,24,92,171 '000':87 '0x8335':77 '20':86 '2913':78 '6':97 'Base network API' 'USDC micropayment API' 'accept':62 'access':6,20,60,189 'across':128 'advertis':107 'ai':138 'analysi':142 'analyt':132 'api':5,19,46,59,100,188 'attach':110 'avail':241 'base':8,22,50,80,88 'base-network' 'behind':179 'beyond':184 'broader':123 'call':45 'caller':108,228 'categori':130 'challeng':70 'classif':145 'connect':211 'content':217 'contract':76 'convers':162 'cost':84 'crawl':201 'crypto-paid endpoint' 'data':131,135,221 'decim':98 'doc':202 'document':183,239 'embed':146 'endpoint':30,127,165,226 'equal':91 'estim':156 'exampl':198 'exchang':151 'export':136 'feed':150 'financ':147 'four':129 'function':178 'gas':155 'gate':3,17,65 'generat':163 'generic':186 'geocod':160 'header':115 'host':47 'howev':175 'infrastructur':158 'insight':137 'key':101 'know':219 'label':57,190 'learn':140 'limit':105 'list':167 'lowpaymentfee' 'lowpaymentfee.com':32,124 'machin':139 'maximum':83 'metric':133 'network':51 'no-api-key' 'no-rate-limit' 'offer':126 'opaqu':234 'openapi':194 'page':206 'paid':235 'part':34 'particular':225 'pay':9,23,43 'pay-per-cal':42 'pay-per-call API' 'pay-per-request' 'payment':69,71,114,120 'per':11,25,44,93 'platform':125 'point':174 'post':63 'post-endpoint' 'premium':4,18,58,187 'premium API access' 'price':149,173,203 'proof':121 'protocol':41 'quot':154 'rate':104,152 'readm':205 'report':134 'request':12,26,64,94 'request/response':197 'resourc':54,236 'return':208,227 'schema':195 'sentiment':141 'servic':223 'settl':73 'simpli':109 'specif':53,177 'stub':213 'subscript':102 'substant':216 'suit':37 'summar':144 'text':143 'token':153 'treat':230 'unit':89 'usdc':14,28,75,95 'usdc-settlement' 'use':96 'util':159 'valid':118,161 'wallet':212 'web3':148 'without':218 'x':113 'x-payment':112 'x402':2,16,40,68,119 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':39","prices":[{"id":"0039e6bb-52c9-4e1f-bd97-e14c3f100edb","listingId":"eac8977f-7773-4979-a38b-69505c8a0ea6","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/policies/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":"2026-04-18T18:51:48.102Z"}],"sources":[{"listingId":"eac8977f-7773-4979-a38b-69505c8a0ea6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/28","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:48.102Z","lastSeenAt":"2026-04-23T05:01:27.293Z"}],"details":{"listingId":"eac8977f-7773-4979-a38b-69505c8a0ea6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/28 \\\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 a 402 x402 challenge requesting 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/28"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/policies/28"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs 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","Demonstrating or testing x402 payment protocol integrations"],"bestFor":["Developers experimenting with x402 pay-per-call protocols","Agents that can settle USDC payments on Base L2","Use cases requiring no-signup, no-rate-limit API access"],"notFor":["Users who need detailed documentation or guaranteed SLAs before calling","High-volume batch workloads where $0.02/request adds up without volume discounts","Anyone who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:03.061Z"},"updatedAt":"2026-04-23T05:01:27.293Z"}}