{"id":"0e4e6611-8043-4ea2-ab18-1e5289110c06","shortId":"u6xtPE","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys needed.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys needed.","description":"lowpaymentfee.com is a collection of x402-protocol pay-per-call API endpoints hosted on the Base network. The specific endpoint `/api/v1/claims/3` is listed as \"Premium API Access\" and returns a 402 challenge requesting payment in USDC (contract 0x8335…2913 on Base). The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. Payment is made via the x402 exact scheme with no API keys, rate limits, or subscriptions required.\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 endpoints are uniformly priced at $0.02 per request.\n\nThe `/api/v1/claims/3` endpoint itself is labeled generically as \"Premium API Access\" with no further documentation about what data or functionality it returns. The docs, pricing, API, and README pages on the site all render only a \"Connect wallet\" prompt with no substantive content. Without additional documentation or example responses, the actual payload returned by this endpoint remains unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","json-response"],"categories":["api","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API","premium API access","402 payment endpoint"],"warnings":["No documentation available — the endpoint's actual functionality is unknown","All non-root pages (docs, pricing, README, api) render only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format","The endpoint name 'Premium API Access' is generic and uninformative"],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/3","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/claims/3","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 402 challenge with clear pricing. However, there is no documentation, no OpenAPI schema, no example request/response, and the endpoint name 'Premium API Access' is completely generic — it is impossible to determine what data or functionality this endpoint actually provides. The site's docs/pricing/README pages are all blank beyond a wallet-connect 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'0.02':10,27,95,162 '000':86 '0x8335':74 '20':85 '2913':75 '402':67 '402 payment endpoint' '6':91 'Base network API' 'USDC micropayment API' 'access':6,23,63,175 'across':120 'actual':215 'addit':209 'advertis':118 'ai':130 'amount':80 'analysi':134 'analyt':124 'api':5,22,47,62,107,174,190 'base':8,25,52,77,87 'base-network' 'broader':115 'call':46,83 'categori':122 'challeng':68 'classif':137 'collect':38 'connect':201 'content':207 'contract':73 'convers':154 'data':123,127,182 'decim':92 'doc':188 'document':179,210 'embed':138 'endpoint':48,56,119,157,167,220 'equal':94 'estim':148 'exact':103 'exampl':212 'exchang':143 'export':128 'feed':142 'financ':139 'four':121 'function':184 'gas':147 'gate':3,20 'generat':155 'generic':171 'geocod':152 'host':49 'infrastructur':150 'insight':129 'json-response' 'key':16,33,108 'label':170 'learn':132 'limit':110 'list':59 'lowpaymentfee' 'lowpaymentfee.com':35,116 'machin':131 'made':99 'maximum':79 'metric':125 'need':17,34 'network':53 'no-api-key' 'page':193 'pay':9,26,44 'pay-per-cal':43 'pay-per-call API' 'pay-per-request' 'payload':216 'payment':70,97 'per':11,28,45,82,163 'platform':117 'premium':4,21,61,173 'premium API access' 'price':141,160,189 'prompt':203 'protocol':42 'quot':146 'rate':109,144 'readm':192 'remain':221 'render':198 'report':126 'request':12,29,69,164 'requir':81,113 'respons':213 'return':65,186,217 'scheme':104 'sentiment':133 'site':196 'specif':55 'subscript':112 'substant':206 'summar':136 'text':135 'token':145 'uniform':159 'unit':88 'unknown':222 'usd':96 'usdc':14,31,72,90 'usdc-settlement' 'util':151 'valid':153 'via':100 'wallet':202 'web3':140 'without':208 'x402':2,19,41,102 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':40","prices":[{"id":"e1a9ad74-f9bd-4f89-96a9-f8c2f991a9e0","listingId":"0e4e6611-8043-4ea2-ab18-1e5289110c06","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/claims/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:46.462Z"}],"sources":[{"listingId":"0e4e6611-8043-4ea2-ab18-1e5289110c06","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/3","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:46.462Z","lastSeenAt":"2026-04-22T10:01:46.011Z"}],"details":{"listingId":"0e4e6611-8043-4ea2-ab18-1e5289110c06","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/3 \\\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/claims/3"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/claims/3"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, rate limits, or minimums","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 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 keyless, zero-commitment API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-compatible USDC wallet","High-volume consumers who need bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.53Z"},"updatedAt":"2026-04-22T10:01:46.011Z"}}