{"id":"cb79cbc3-e2d1-4614-a2ba-48d93860159f","shortId":"dQtK28","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com offers a collection of pay-per-call API endpoints gated by the x402 protocol, settling payments in USDC on the Base network. The specific endpoint at `/api/v1/charges/224` is labeled \"Premium API Access\" and accepts POST requests with a maximum cost of 20,000 base units of USDC (i.e., $0.02 per request, since USDC uses 6 decimals). No API keys or rate limits are advertised; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises four categories of endpoints: 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 are priced at $0.02 per request.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the `/api/v1/charges/224` endpoint actually returns. The endpoint is confirmed live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality \"Premium API Access\" provides versus the other named endpoints.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method","json-response"],"categories":["api-gateway","data","llm","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","premium api access"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all return only a 'Connect wallet' prompt","No OpenAPI schema or request/response examples provided","The specific functionality of /api/v1/charges/224 ('Premium API Access') is undefined; it is unclear how it differs from the other listed endpoints","Cannot verify what data or service is actually delivered after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/224","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/charges/224","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet' with no schemas, examples, or descriptions of what the endpoint returns. The specific purpose of '/api/v1/charges/224' is unclear beyond the generic label 'Premium API 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'/api/v1/charges/224':61,200 '/docs':168 '/pricing':169 '/readme':172 '/request':16,32 '0.02':15,31,83,160 '000':77 '20':76 '402':212 '6':89 'accept':68 'access':66,226 'actual':202 'advertis':98,116 'ai':9,25,128 'analysi':132 'analyt':8,24,122 'api':4,20,42,65,92,225 'attach':101 'base':7,23,55,78 'base network api' 'base-network' 'broader':114 'call':41 'caller':99 'categori':118 'challeng':213 'classif':135 'collect':36 'confirm':207 'connect':178 'content':184 'convers':152 'cost':74 'data':121,125,221 'decim':90 'descript':196 'detail':195 'document':163,216 'embed':136 'endpoint':13,29,43,59,120,156,201,205,232 'estim':146 'exampl':192 'exchang':141 'export':126 'extrem':165 'feed':140 'financ':10,26,137 'four':117 'function':223 'gas':145 'gate':3,19,44 'generat':153 'geocod':150 'header':106 'i.e':82 'infrastructur':148 'insight':127 'json-response' 'key':93 'label':63 'learn':130 'limit':96 'list':155 'live':208 'low payment fee' 'lowpaymentfee.com':33 'machin':129 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'x402-payment'","prices":[{"id":"d5eced3d-f426-4e36-8e57-8085f3915cd2","listingId":"cb79cbc3-e2d1-4614-a2ba-48d93860159f","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/charges/224","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:32.095Z"}],"sources":[{"listingId":"cb79cbc3-e2d1-4614-a2ba-48d93860159f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/224","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:32.095Z","lastSeenAt":"2026-04-23T19:01:04.068Z"}],"details":{"listingId":"cb79cbc3-e2d1-4614-a2ba-48d93860159f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/224 \\\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 endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/224"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/224"},{"claim":"All listed endpoints are priced at $0.02 per 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 & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to analytics, AI inference, or financial data with per-request USDC micropayments","Agent-driven workflows that need keyless, on-demand API access without subscriptions","Integrating sentiment analysis, summarization, or embeddings into applications via x402 payment"],"bestFor":["Developers who want pay-as-you-go API access without managing API keys","AI agents that can settle x402 payments on Base","Low-volume or bursty workloads where $0.02/request is cost-effective"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users who need comprehensive API docs, request/response schemas, or sandbox environments before committing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.115Z"},"updatedAt":"2026-04-23T19:01:04.068Z"}}