{"id":"b38fd3cd-0443-40c1-9cfe-77cec38e9ad2","shortId":"ZTFya7","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/charges/128` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform offers endpoints across four 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\nHowever, documentation is extremely thin. 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 crawled content. It is unclear what specific data or functionality the `/api/v1/charges/128` endpoint returns, as the listing title \"Premium API Access\" is generic and not descriptive of a concrete capability.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","402 payment API"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific endpoint /api/v1/charges/128 has a generic name ('Premium API Access') with no description of its actual functionality","Cannot verify what data or service this endpoint provides beyond the payment challenge"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/128","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/128","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the endpoint name 'Premium API Access' is generic with no indication of what it actually returns. Effectively a stub 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'/request':13,30,156 '0.02':12,29,82,155 '000':76 '20':75 '402':70 '402 payment API' 'Base network API' 'USDC API' 'accept':50 'access':66,96,219 'across':112 'advertis':87 'ai':122 'ai-inference' 'analysi':126 'analyt':116 'api':5,15,22,32,42,65,89,166,218 'attach':99 'avail':196 'base':8,25,55,77 'broader':108 'call':4,21,84 'capabl':228 'categori':114 'challeng':71 'classif':129 'concret':227 'connect':175 'content':200 'convers':146 'crawl':199 'data':115,119,206 'data-analytics' 'descript':224 'detail':182 'doc':165 'document':160,191 'embed':130 'endpoint':59,111,149,211 'estim':140 'exampl':195 'exchang':135 'export':120 'extrem':162 'feed':134 'financ':131 'finance-data' 'four':113 'function':208 'gas':139 'generat':147 'generic':221 'geocod':144 'header':103 'howev':159 'i.e':81 'infrastructur':142 'insight':121 'instant':95 'key':16,33,90 'learn':124 'limit':93 'list':62,151,215 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':123 'metric':117 'micropayment API' 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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/charges/128","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:16.423Z"}],"sources":[{"listingId":"b38fd3cd-0443-40c1-9cfe-77cec38e9ad2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/128","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:16.423Z","lastSeenAt":"2026-04-24T00:03:20.935Z"}],"details":{"listingId":"b38fd3cd-0443-40c1-9cfe-77cec38e9ad2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/128 \\\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 ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/128"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/128"}],"useCases":["Accessing data analytics and reports on a per-request payment basis without subscription","Running AI inference tasks (sentiment, summarization, classification, embeddings) with per-call USDC payments","Fetching financial data like token quotes, exchange rates, and gas estimates via micropayments","Using utility services like geocoding and validation without needing API keys"],"bestFor":["Developers who want pay-as-you-go API access without subscriptions or API key management","Agents and bots that can settle payments programmatically via x402 on Base","Low-volume or sporadic API consumers who don't want monthly commitments"],"notFor":["High-volume production workloads where $0.02/request adds up and bulk pricing would be preferable","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.876Z"},"updatedAt":"2026-04-24T00:03:20.935Z"}}