{"id":"455bef35-5ad7-453c-997e-ec26a99f6065","shortId":"wrDUvm","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.","tagline":"x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.","description":"lowpaymentfee.com hosts a collection of x402-protocol pay-per-request API endpoints on the Base network, settling in USDC. The specific endpoint `/api/v1/claims/63` is listed as \"Premium API Access\" and returns a standard x402 402 challenge when called without payment. The challenge specifies an exact-scheme payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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 listed at the same $0.02/request price point. However, the specific endpoint `/api/v1/claims/63` does not clearly map to any of these named services — its description is simply \"Premium API Access\" with no further documentation about what data or functionality it returns.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what this endpoint actually returns. The endpoint is confirmed live (402 challenge captured), but without knowing what it does, callers are operating blind.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response"],"categories":["api","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","The endpoint '/api/v1/claims/63' does not correspond to any of the named services listed on the homepage (analytics, AI, finance, infrastructure)","No request or response schema is documented; callers cannot know what to send or what they will receive","No OpenAPI specification or ai-plugin manifest found","The actual functionality behind 'Premium API Access' is completely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/63","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/63","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 with a valid x402 402 challenge, but there is zero documentation on what the endpoint actually does or returns. No OpenAPI spec, no request/response schema, no examples. The /docs and other pages are empty. The endpoint path '/api/v1/claims/63' and description 'Premium API Access' are completely generic. This is effectively a stub 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'/api/v1/claims/63':59,186 '/docs':220 '/pricing':222 '/readme':224 '/request':17,34,179 '0.02':16,33,100,178 '000':89 '0x8335':94 '20':88 '2913':95 '402':71,260 '6':105 'Base network API' 'USDC micropayment API' 'access':65,203 'across':135 'actual':253 'advertis':133 'ai':145 'analysi':149 'analyt':139 'api':5,22,47,64,108,202 'attach':117 'base':8,25,51,90,97 'base-network' 'blind':272 'broader':130 'call':12,29,74 'caller':115,269 'captur':262 'categori':137 'challeng':72,78,261 'classif':152 'clear':189 'collect':38 'confirm':258 'connect':230 'content':236 'convers':169 'crypto-paid endpoint' 'data':138,142,210 'decim':106 'descript':198 'document':207,215,245 'embed':153 'endpoint':6,23,48,58,134,172,185,252,256 'equal':99 'estim':163 'exact':82 'exact-schem':81 'exampl':248 'exchang':158 'export':143 'extrem':217 'feed':157 'financ':154 'four':136 'function':212 'gas':162 'gate':3,20 'generat':170 'geocod':167 'header':122 'host':36 'howev':182 'infrastructur':165 'insight':144 'json-response' 'key':109 'know':265 'learn':147 'limit':112 'list':61,174 'live':259 'lowpaymentfee' 'lowpaymentfee.com':35,131 'machin':146 'map':190 'metric':140 'name':195 'network':52 'no-api-key' 'openapi':240 'oper':271 'page':225 'pay':10,27,44 'pay-per-cal':9,26 'pay-per-call API' 'pay-per-request':43 'payment':76,84,121,127 'per':11,28,45,101 'platform':132 'point':181 'premium':4,21,63,201 'premium API access' 'price':156,180 'prompt':232 'proof':128 'protocol':42 'quot':161 'rate':111,159 'render':227 'report':141 'request':46,102 'request/response':243 'requir':114 'return':67,214,254 'schema':244 'scheme':83 'sentiment':148 'servic':196 'settl':53 'simpli':116,200 'spars':218 'spec':241 'specif':57,184 'specifi':79 'standard':69 'substant':235 'summar':151 'text':150 'token':160 'unit':91 'usdc':14,31,55,93,103 'usdc-settlement' 'use':104 'util':166 'valid':125,168 'wallet':231 'web3':155 'without':75,264 'x':120 'x-payment':119 'x402':2,19,41,70,126 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':40","prices":[{"id":"71493580-d7dd-446a-a124-54e7f77ed2aa","listingId":"455bef35-5ad7-453c-997e-ec26a99f6065","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/63","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:53.731Z"}],"sources":[{"listingId":"455bef35-5ad7-453c-997e-ec26a99f6065","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/63","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:53.731Z","lastSeenAt":"2026-04-22T10:01:46.349Z"}],"details":{"listingId":"455bef35-5ad7-453c-997e-ec26a99f6065","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/63 \\\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 x402 challenge specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/claims/63"},{"claim":"All endpoints on the platform are listed at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"The /docs, /api, /pricing, and /README pages render only a 'Connect wallet' prompt with no documentation content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to an unknown premium data or service endpoint via x402 micropayments","Demonstrating x402 protocol integration for agent-to-agent payments on Base","Testing low-cost pay-per-request API patterns without API key registration"],"bestFor":["Developers experimenting with x402 protocol payments on Base","Agents that need keyless, pay-per-call API access settled in USDC","Projects exploring micropayment-gated API architectures"],"notFor":["Anyone needing documented, well-specified API contracts before integrating","Production use cases requiring SLAs, rate limit guarantees, or support","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.172Z"},"updatedAt":"2026-04-22T10:01:46.349Z"}}