{"id":"d4049344-c46a-40f8-9688-76c342ba7caa","shortId":"gBHAwR","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The specific endpoint at `/api/v1/transfers/78` is listed as \"Premium API Access\" and accepts POST requests settled via the x402 exact-payment scheme.\n\nThe platform advertises categories including 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 appear to follow the same $0.02 pricing model.\n\nDocumentation is extremely sparse — 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 material. The x402 challenge for this specific endpoint confirms it is live and accepts USDC payments on Base (asset 0x8335…2913) with a max amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals).","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["ai","data","finance","infrastructure"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC API","Base network API","micropayment API","crypto API access"],"warnings":["No OpenAPI spec or request/response schema available","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no technical content","The specific endpoint '/api/v1/transfers/78' labeled 'Premium API Access' has no description of what data or service it provides","Cannot verify what any endpoint actually returns without paying"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/78","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/78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is zero documentation on request/response schemas, no OpenAPI spec, and all doc pages render only a wallet-connect prompt. The endpoint path '/api/v1/transfers/78' gives no indication of what it actually returns. This is effectively a stub 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'/api/v1/transfers/78':84 '/docs':156 '/pricing':158 '/readme':160 '/request':13,28 '0.02':12,27,59,148,222 '000':218 '0x8335':210 '20':217 '2913':211 '6':226 'Base network API' 'USDC API' 'accept':92,204 'access':90 'advertis':105 'ai':115 'ai-inference' 'ai/ml':49 'amount':215 'analysi':119 'analyt':48,109 'api':5,20,37,71,89 'appear':143 'asset':209 'avail':187 'base':8,23,67,208,219 'broad':42 'call':4,19 'catalog':43 'categori':106 'challeng':194 'classif':122 'classification' 'commit':79 'confirm':199 'connect':166 'convers':139 'cost':58 'crawl':190 'crypto API access' 'crypto-quotes' 'data':47,52,108,112 'data-analytics' 'decim':227 'detail':173 'document':151,182 'embed':123 'embeddings' 'enabl':36 'endpoint':45,57,82,142,198 'estim':133 'everi':56 'exact':100 'exact-pay':99 'exampl':186 'exchang':128 'export':113 'extrem':153 'feed':127 'financ':124 'finance-data' 'finance/web3':51 'follow':145 'gas':132 'generat':140 'geocod':137 'geocoding' 'given':223 'i.e':221 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'x402-payment'","prices":[{"id":"32e0637f-b65a-4af2-8f36-ff02542ccb7b","listingId":"d4049344-c46a-40f8-9688-76c342ba7caa","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/78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:54.894Z"}],"sources":[{"listingId":"d4049344-c46a-40f8-9688-76c342ba7caa","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/78","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:54.894Z","lastSeenAt":"2026-04-22T09:01:48.923Z"}],"details":{"listingId":"d4049344-c46a-40f8-9688-76c342ba7caa","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/78 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge confirms USDC on Base with maxAmountRequired of 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/transfers/78"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data and crypto quotes on a per-request basis","Running geocoding, validation, or data conversion tasks with instant pay-per-use pricing","Exporting analytics data or generating reports via programmatic API calls"],"bestFor":["Developers who want instant API access without signup or API keys","Agents and bots that can settle payments in USDC on Base via x402","Low-volume or bursty workloads where per-request pricing is more economical than subscriptions"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume production workloads where per-request costs add up versus flat-rate plans","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.685Z"},"updatedAt":"2026-04-22T09:01:48.923Z"}}