{"id":"05087548-dc84-4aa5-856d-5416d4251346","shortId":"cU6vxW","kind":"x402","title":"Pay-per-request API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/keys/50` is listed as \"Premium API Access\" and costs up to $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe 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 listed endpoints share the same $0.02 per-request pricing. The x402 challenge was successfully captured with version 1 of the protocol, confirming the endpoint is live.\n\nNote that the specific functionality behind the `/api/v1/keys/50` path is unclear — the description simply says \"Premium API Access\" without detailing what data or service it returns. No OpenAPI schema, request/response examples, or detailed documentation were found during the crawl. The /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","micropayment API","x402 API","pay-per-call API","USDC API","Base network API","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific functionality of /api/v1/keys/50 ('Premium API Access') is not described anywhere","All documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no content","No request or response examples are available to verify what the endpoint actually returns","The breadth of advertised capabilities (AI, finance, data, utilities) cannot be verified from available material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/50","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/keys/50","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and no documentation beyond a landing page listing endpoint names. The specific purpose of /api/v1/keys/50 is undocumented. Effectively a stub 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'/api/v1/keys/50':69,186 '/call':19,38 '/pricing':220 '/readme':222 '0.02':18,37,80,157 '000':84 '1':170 '20':83 '6':90 'Base network API' 'USDC API' 'access':75,196 'addit':233 'advertis':114 'ai':12,31,125 'ai-inference' 'analysi':129 'analyt':119 'api':5,24,45,74,93,195 'attach':104 'base':8,27,63,85 'base-network' 'behind':184 'broad':50 'caller':102 'captur':167 'catalog':51 'categori':117 'challeng':164 'classif':132 'commit':99 'confirm':174 'connect':228 'content':234 'convers':149 'cost':77 'crawl':217 'crypto-paid API' 'data':11,30,118,122,200 'data-analytics' 'decim':91 'descript':191 'detail':198,211 'document':212 'embed':133 'embeddings' 'enabl':44 'endpoint':16,35,57,67,116,153,176 'estim':143 'exampl':209 'exchang':138 'export':123 'feed':137 'financ':13,32,134 'finance-data' 'found':214 'four':115 'function':183 'gas':142 'generat':150 'geocod':147 'geocoding' 'header':108 'infrastructur':145 'insight':124 'key':94 'learn':127 'limit':96 'list':71,152 'live':178 'low 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'x402-payment'","prices":[{"id":"b89c6f9c-887f-4cf7-a60c-0d0c8d64d87d","listingId":"05087548-dc84-4aa5-856d-5416d4251346","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/keys/50","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.561Z"}],"sources":[{"listingId":"05087548-dc84-4aa5-856d-5416d4251346","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/50","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.561Z","lastSeenAt":"2026-04-22T01:02:18.919Z"}],"details":{"listingId":"05087548-dc84-4aa5-856d-5416d4251346","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/50 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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 network","source_url":"https://lowpaymentfee.com/api/v1/keys/50"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/50"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without subscription","Fetching real-time financial data like token quotes, gas estimates, and exchange rates per request","Running utility operations like geocoding, validation, or data conversion with no upfront commitment","Accessing analytics metrics and reports with per-call billing"],"bestFor":["AI agents that need low-cost, no-auth API access settled on-chain","Developers prototyping with pay-as-you-go endpoints on Base","Applications requiring diverse lightweight API calls without managing API keys"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed SLAs, documentation, or guaranteed uptime","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.626Z"},"updatedAt":"2026-04-22T01:02:18.919Z"}}