{"id":"49b63e54-b4dc-438d-bcd6-8fd3044b3688","shortId":"MukcRx","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/8` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or subscriptions are required — each request is paid individually via the x402 protocol.\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 endpoints are listed at the same $0.02 per request price point.\n\nThe specific functionality behind `/api/v1/keys/8` (\"Premium API Access\") is not documented in detail. The crawled pages beyond the landing page returned only wallet-connect prompts with no additional documentation, OpenAPI spec, or usage examples. The endpoint is confirmed live via a valid 402 challenge, but what data or service it returns upon successful payment is unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","premium api access"],"warnings":["No OpenAPI spec or schema available for any endpoint","The specific purpose of /api/v1/keys/8 ('Premium API Access') is undocumented — unclear what it returns","All documentation pages beyond the landing page returned only 'Connect wallet' with no content","No response examples or error documentation available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/8","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/8","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but there is no OpenAPI spec, no documentation beyond a landing page listing, and no examples or response schemas. The actual functionality of /api/v1/keys/8 ('Premium API Access') is entirely opaque — it could be an API key provisioning endpoint or something else. Effectively a stub 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'/request':19,38 '0.02':18,37,79,156 '000':83 '20':82 '402':204 '6':89 'access':74,168 'addit':189 'advertis':112 'ai':12,31,123 'ai-inference' 'analysi':127 'analyt':117 'api':5,24,45,73,92,167 'base':8,27,63,84 'base network api' 'base-network' 'behind':164 'beyond':177 'broad':50 'call':4,23,81 'catalog':51 'categori':115 'challeng':205 'classif':130 'classification' 'confirm':199 'connect':185 'convers':147 'cost':76 'crawl':175 'data':11,30,116,120,208 'data-analytics' 'decim':90 'detail':173 'document':171,190 'embed':131 'embeddings' 'enabl':44 'endpoint':16,35,57,67,114,150,197 'estim':141 'exampl':195 'exchang':136 'export':121 'feed':135 'financ':13,32,132 'finance-data' 'four':113 'function':163 'gas':140 'generat':148 'geocod':145 'geocoding' 'individu':104 'infrastructur':143 'insight':122 'key':93 'land':179 'learn':125 'limit':95 'list':70,152 'live':200 'low payment fee' 'lowpaymentfee.com':39 'machin':124 'metric':118 'micropayment api' 'network':64 'no-api-key' 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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/8","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.889Z"}],"sources":[{"listingId":"49b63e54-b4dc-438d-bcd6-8fd3044b3688","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/8","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.889Z","lastSeenAt":"2026-04-22T01:02:19.330Z"}],"details":{"listingId":"49b63e54-b4dc-438d-bcd6-8fd3044b3688","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/8 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/8"},{"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"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/8"}],"useCases":["Agents needing on-demand API access without managing API keys or subscriptions","Paying per-call for AI inference tasks like sentiment analysis or text summarization","Fetching real-time financial data (prices, exchange rates, gas estimates) with micropayments","Geocoding or data validation without rate limits"],"bestFor":["AI agents that need frictionless, keyless API access via x402","Developers who want pay-as-you-go pricing with no commitments","Use cases requiring low-cost micropayment-settled API calls on Base"],"notFor":["High-volume production workloads where per-call pricing becomes expensive compared to subscription APIs","Users who need detailed API documentation, schemas, or SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.081Z"},"updatedAt":"2026-04-22T01:02:19.330Z"}}