{"id":"2f8d48fd-2ea0-4c0a-a5c7-f0cd7be3bd04","shortId":"yQ58uK","kind":"x402","title":"x402-gated API suite on Base: AI, analytics, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API suite on Base: AI, analytics, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com hosts a collection of x402-protocol pay-per-call API endpoints settled in USDC on the Base network. The specific endpoint `/api/v1/claims/20` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base-unit USDC (i.e., $0.02) per request. No API keys or rate limits are advertised; callers simply attach an x402 payment header to each request.\n\nThe broader platform advertises four endpoint 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\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 crawl. The exact functionality of the `/api/v1/claims/20` endpoint is unclear beyond its title. Callers should expect to experiment or contact the provider for integration guidance.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","sentiment-analysis","text-summarization","classification","embeddings","analytics","geocoding","price-feeds","gas-estimates"],"categories":["api-marketplace","ai","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","premium api access"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior must be discovered experimentally","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no technical content","The specific purpose of /api/v1/claims/20 ('Premium API Access') is not described anywhere","No request body schema or response examples are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/20","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/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the purpose of '/api/v1/claims/20' is not explained. Effectively a stub 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'/api/v1/claims/20':57,196 '/docs':156 '/pricing':158 '/readme':160 '/request':16,32,148 '0.02':15,31,79,147 '000':73 '20':72 '402':67 'access':63 'advertis':89,103 'ai':8,24,114 'analysi':118 'analyt':9,25,108 'analytics' 'api':4,20,45,62,83 'attach':92 'avail':187 'base':7,23,52,75 'base network api' 'base-network' 'base-unit':74 'beyond':200 'broader':101 'call':44 'caller':90,203 'categori':106 'challeng':68 'classif':121 'classification' 'collect':36 'connect':166 'contact':209 'convers':138 'crawl':190 'data':107,111 'detail':173 'document':151,182 'embed':122 'embeddings' 'endpoint':13,29,46,56,105,141,197 'estim':132 'exact':192 'exampl':186 'exchang':127 'expect':205 'experi':207 'export':112 'extrem':153 'feed':126 'financ':10,26,123 'four':104 'function':193 'gas':131 'gas-estimates' 'gate':3,19 'generat':139 'geocod':136 'geocoding' 'guidanc':214 'header':96 'host':34 'i.e':78 'infrastructur':134 'insight':113 'integr':213 'key':84 'learn':116 'limit':87 'list':59,143 'low payment fee' 'lowpaymentfee.com':33 'machin':115 'metric':109 'micropayment api' 'network':53 'no-api-key' 'openapi':177 'page':161 'pay':42 'pay per call api' 'pay-per-cal':41 'pay-per-request' 'payment':95 'per':43,80 'platform':102 'point':150 'premium':61 'premium api access' 'price':125,149 'price-feeds' 'prompt':168 'protocol':40 'provid':211 'quot':130 'rate':86,128 'render':163 'report':110 'request':69,81,99 'request/response':180 'return':65 'schema':181 'sentiment':117 'sentiment-analysis' 'settl':47 'simpli':91 'spars':154 'spec':178 'specif':55 'suit':5,21 'summar':120 'technic':172 'text':119 'text-summarization' 'titl':202 'token':129 'unclear':199 'unit':76 'usag':185 'usdc':49,77 'usdc api' 'usdc-settlement' 'util':12,28,135 'valid':137 'wallet':167 'web3':124 'x402':2,18,39,94 'x402 api' 'x402-gated':1,17 'x402-payment' 'x402-protocol':38","prices":[{"id":"d1f85f11-b198-43be-a325-e6e9fb64b577","listingId":"2f8d48fd-2ea0-4c0a-a5c7-f0cd7be3bd04","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/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:46.471Z"}],"sources":[{"listingId":"2f8d48fd-2ea0-4c0a-a5c7-f0cd7be3bd04","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/20","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:46.471Z","lastSeenAt":"2026-04-22T16:31:18.876Z"}],"details":{"listingId":"2f8d48fd-2ea0-4c0a-a5c7-f0cd7be3bd04","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/20 \\\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 requesting up to 20,000 base-unit USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/claims/20"},{"claim":"The asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/claims/20"},{"claim":"All endpoints are listed at $0.02/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"},{"claim":"Documentation pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Calling AI inference endpoints (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates via micropayments","Running utility operations like geocoding, validation, and data conversion on a per-request payment basis"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access settled on-chain","Agents and bots that can attach x402 payment headers automatically","Users who prefer no API key management or rate-limit overhead"],"notFor":["Teams needing detailed API documentation or OpenAPI specs before integration","High-volume production workloads where $0.02/request adds up significantly","Users without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.525Z"},"updatedAt":"2026-04-22T16:31:18.876Z"}}