{"id":"892e0b41-e965-41f7-8d56-c418b91cac4c","shortId":"Z2mv8R","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":"lowpaymentfee.com hosts a collection of x402-protocol pay-per-call API endpoints on the Base network, settled in USDC. The specific endpoint at `/api/v1/policies/9` is labeled \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) per request. The site advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader 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\nThe `/api/v1/policies/9` endpoint itself is live and responds with a well-formed x402 v1 challenge. However, there is no OpenAPI schema, no documentation beyond the landing page, and no example request/response payloads available. The actual data or functionality returned by this specific \"Premium API Access\" endpoint is not described anywhere in the crawled material, making it unclear what it does beyond its generic label.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","no-api-key","pay-per-call","json-response"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","402 payment endpoint"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all render only a 'Connect wallet' prompt with no content.","The specific functionality of /api/v1/policies/9 ('Premium API Access') is not described anywhere; it is unclear what data or service it provides.","No OpenAPI schema or request/response examples are available.","No rate limit or uptime guarantees are documented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/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/policies/9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI schema, no documentation, no example requests or responses, and the actual functionality of '/api/v1/policies/9' is completely undescribed. The listing is effectively a stub with pricing info 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'/request':153 '0.02':10,24,74,152 '000':69 '20':68 '402':63 '402 payment endpoint' 'Base network API' 'USDC micropayment API' 'access':6,20,59,89,201 'across':109 'actual':191 'advertis':80 'ai':119 'analysi':123 'analyt':113 'anywher':206 'api':5,19,41,58,82,200 'attach':92 'avail':189 'base':8,22,45,70 'base-network' 'beyond':180,217 'broader':105 'call':40 'caller':90 'categori':111 'challeng':64,171 'classif':126 'collect':32 'convers':143 'crawl':209 'data':112,116,192 'describ':205 'document':179 'embed':127 'endpoint':42,52,108,146,158,202 'estim':137 'exampl':186 'exchang':132 'export':117 'feed':131 'financ':128 'form':168 'four':110 'function':194 'gas':136 'gate':3,17 'generat':144 'generic':219 'geocod':141 'header':97 'host':30 'howev':172 'infrastructur':139 'insight':118 'instant':88 'json-response' 'key':83 'label':56,220 'land':182 'learn':121 'limit':86 'list':148 'live':161 'lowpaymentfee' 'lowpaymentfee.com':29 'machin':120 'make':211 'materi':210 'metric':114 'network':46 'no-api-key' 'offer':107 'openapi':176 'page':183 'pay':9,23,38 'pay-per-cal':37 'pay-per-call' 'pay-per-call API' 'payload':188 'payment':96,102 'per':11,25,39,76 'per-request-billing' 'platform':106 'point':155 'premium':4,18,57,199 'premium API access' 'price':130,154 'proof':103 'protocol':36 'quot':135 'rate':85,133 'report':115 'request':12,26,65,77 'request/response':187 'respond':163 'return':61,195 'schema':177 'sentiment':122 'settl':47 'simpli':91 'site':79 'specif':51,198 'summar':125 'text':124 'token':134 'unclear':213 'unit':71 'usd':75 'usdc':14,28,49,73 'usdc-settlement' 'util':140 'v1':170 'valid':100,142 'web3':129 'well':167 'well-form':166 'x':95 'x-payment':94 'x402':2,16,35,101,169 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':34","prices":[{"id":"c2d9e69b-0d1e-43a1-8f4d-74b5ef8f8145","listingId":"892e0b41-e965-41f7-8d56-c418b91cac4c","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/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":"2026-04-18T18:52:03.895Z"}],"sources":[{"listingId":"892e0b41-e965-41f7-8d56-c418b91cac4c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/9","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:03.895Z","lastSeenAt":"2026-04-23T06:31:18.631Z"}],"details":{"listingId":"892e0b41-e965-41f7-8d56-c418b91cac4c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/9 \\\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 challenge requesting up to 20,000 base units of USDC (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/policies/9"},{"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 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-call API without managing API keys or subscriptions","Agent-driven workflows that need on-demand endpoint access settled in USDC on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-as-you-go API access","Low-volume callers who want no subscription commitment"],"notFor":["Users who need detailed documentation or guaranteed SLAs","High-volume production workloads where $0.02/request adds up quickly","Anyone who needs to know exactly what data the endpoint returns before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.331Z"},"updatedAt":"2026-04-23T06:31:18.631Z"}}