{"id":"f994918e-ddb7-4488-96db-4ff2fd269e40","shortId":"h8JH72","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","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 `/api/v1/keys/99` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or subscriptions are required; callers attach an X-PAYMENT header with a signed USDC payment to each request.\n\nThe wider 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/request pricing. The platform claims no rate limits, no minimums, and instant access.\n\nNote that the specific functionality behind `/api/v1/keys/99` (\"Premium API Access\") is not documented beyond its title. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled pages. The broader endpoint catalog gives context for the platform but the exact behavior of this particular route remains unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["pay-per-call API","x402 API","USDC micropayment API","Base network API","low fee API","crypto-paid API","serverless API access"],"warnings":["No OpenAPI or schema available — request and response formats are unknown","The exact functionality of /api/v1/keys/99 ('Premium API Access') is not documented anywhere in the crawled material","Documentation, pricing, and README pages all returned only a 'Connect wallet' stub with no useful content","No rate limit or SLA information available despite the claim of 'no rate limits'"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/99","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/99","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 spec, no request/response schema, no documentation for what /api/v1/keys/99 actually returns, and the crawled pages beyond the homepage are empty wallet-connect stubs. The specific endpoint's purpose is essentially 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'/request':19,38,167 '0.02':18,37,79,166 '000':83 '20':82 '6':89 'Base network API' 'USDC micropayment API' 'access':74,179,189 'account':101 'advertis':124 'ai':12,31,135 'ai-inference' 'analysi':139 'analyt':129 'api':5,24,45,73,99,188 'attach':107 'avail':208 'base':8,27,63,84 'base-network' 'behavior':225 'behind':185 'beyond':193 'broad':50 'broader':214 'call':4,23,81 'caller':106 'catalog':51,216 'categori':127 'claim':171 'classif':142 'context':218 'convers':158 'cost':76 'crawl':211 'crypto-paid API' 'data':11,30,128,132 'data-analytics' 'decim':90 'document':192 'embed':143 'enabl':44 'endpoint':16,35,57,67,126,162,215 'estim':153 'exact':224 'exampl':207 'exchang':148 'export':133 'feed':147 'financ':13,32,144 'finance-data' 'four':125 'function':184 'gas':152 'generat':159 'geocod':156 'give':217 'handl':93 'header':112 'infrastructure/utilities':155 'insight':134 'instant':178 'key':100 'learn':137 'limit':174 'list':70,161 'low fee API' 'lowpaymentfee.com':39 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'x402-payment'","prices":[{"id":"9238eed4-ddd6-46a2-a908-a0cad06b1b8f","listingId":"f994918e-ddb7-4488-96db-4ff2fd269e40","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/99","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.048Z"}],"sources":[{"listingId":"f994918e-ddb7-4488-96db-4ff2fd269e40","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/99","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.048Z","lastSeenAt":"2026-04-22T01:02:19.529Z"}],"details":{"listingId":"f994918e-ddb7-4488-96db-4ff2fd269e40","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/99 \\\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 units of USDC (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/99"},{"claim":"All listed endpoints cost $0.02 per request with no API keys, no rate limits, no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand access to AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time financial data (prices, exchange rates, gas estimates) with per-call USDC micropayments","Running utility operations like geocoding or data validation without subscription commitments","Programmatic data export and analytics reporting paid per request"],"bestFor":["AI agents or bots that need frictionless, keyless API access settled on-chain","Developers who want pay-as-you-go pricing with no minimums or rate limits","Web3-native applications that already hold USDC on Base"],"notFor":["High-volume production workloads where $0.02/request adds up significantly compared to subscription-based alternatives","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04.872Z"},"updatedAt":"2026-04-22T01:02:19.529Z"}}