{"id":"f4114ea7-b26a-4a6f-bf48-ec36e2376593","shortId":"NDsFLq","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base network via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad suite of 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 priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint at `/api/v1/transfers/5` is described as \"Premium API Access\" and advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content. The actual functionality behind the `/api/v1/transfers/5` path is unclear; the name \"Premium API Access\" is generic and does not describe a specific capability. Prospective users should be aware that without documentation, the behavior of individual endpoints must be discovered experimentally.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","low fee API","crypto-paid API","serverless API"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior must be discovered experimentally","The /docs, /pricing, /api, and /README pages contain no usable content (only 'Connect wallet')","The purpose of /api/v1/transfers/5 ('Premium API Access') is completely undocumented","No request body schema or response schema is provided anywhere in the crawled material","Cannot verify what data or functionality any of the listed endpoints actually return"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/5","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/transfers/5","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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and the specific purpose of /api/v1/transfers/5 is undefined. The docs, pricing, and README pages are all empty wallet-connect 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'/api/v1/transfers/5':125,227 '/docs':186 '/pricing':187 '/readme':190 '/request':20,40 '0.02':19,39,97,150 '000':139 '0x8335':144 '20':138 '2913':145 '300':166 '6':154 'Base network API' 'USDC API' 'accept':171 'access':131,235 'across':56 'actual':223 'addit':201 'advertis':133 'ai':13,33,66 'ai-inference' 'analysi':70 'analyt':60 'api':5,25,47,112,130,234 'application/json':176 'avail':217 'awar':249 'base':8,28,105,140,147 'behavior':254 'behind':225 'beyond':178 'broad':52 'call':4,24 'capabl':244 'categori':58 'classif':73 'classification' 'commit':120 'connect':196 'content':221 'convers':90 'cost':136 'crawl':220 'crypto-paid API' 'data':12,32,59,63 'data-analytics' 'decim':155 'describ':127,241 'detail':203 'discov':260 'document':177,212,252 'embed':74 'embeddings' 'enabl':46 'endpoint':17,37,55,93,123,170,257 'equal':149 'estim':84 'exact':162 'exampl':216 'exchang':79 'experiment':261 'export':64 'extrem':183 'feed':78 'financ':14,34,75 'finance-data' 'four':57 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'user':246 'util':16,36,87 'utility-apis' 'valid':89 'via':10,30,107,159 'wallet':197 'web3':76 'without':251 'x402':11,31,45,109,161 'x402 API' 'x402-enabled':44 'x402-payment'","prices":[{"id":"84164505-5e3c-49b0-bccf-9e4cc77e279f","listingId":"f4114ea7-b26a-4a6f-bf48-ec36e2376593","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/transfers/5","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:00.864Z"}],"sources":[{"listingId":"f4114ea7-b26a-4a6f-bf48-ec36e2376593","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/5","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:00.864Z","lastSeenAt":"2026-04-22T15:02:25.899Z"}],"details":{"listingId":"f4114ea7-b26a-4a6f-bf48-ec36e2376593","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/5 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/transfers/5"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto gas estimates or token price quotes with per-call payment","Geocoding or data validation as a utility service paid in USDC on Base","Exporting analytics data or generating reports on a pay-as-you-go basis"],"bestFor":["Developers and agents wanting zero-signup, pay-per-use API access","Crypto-native applications that can settle payments in USDC on Base","Low-volume or bursty workloads where flat subscriptions are wasteful"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where $0.02/request adds up significantly","Users without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.393Z"},"updatedAt":"2026-04-22T15:02:25.899Z"}}