{"id":"468c954f-6632-4f0e-8ad7-319d64ee52d6","shortId":"rm3bd5","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/customers/90` is listed as \"Premium API Access\" and returns JSON via POST.\n\nThe platform advertises four main categories of APIs: 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 use the x402 payment protocol, settling in USDC (contract 0x8335…2913) on Base.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. 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 payments up to 20,000 base units (i.e., $0.02 USDC with 6 decimals).","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC micropayment API","Base network API","crypto API payments","402 payment required API"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The specific purpose and expected input/output of /api/v1/customers/90 is undocumented","No request or response examples are available from any source"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/90","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/customers/90","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge confirms the endpoint is live and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The specific purpose of /api/v1/customers/90 ('Premium API Access') is unexplained. This is effectively a stub 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'/api/v1/customers/90':84 '/docs':157 '/pricing':158 '/readme':161 '/request':13,28 '0.02':12,27,59,213 '000':209 '0x8335':148 '20':208 '2913':149 '402 payment required API' '6':216 'Base network API' 'USDC micropayment API' 'accept':204 'access':90 'advertis':98 'ai':111 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':49 'analysi':115 'analyt':48,105 'api':5,20,37,71,89,103 'avail':187 'base':8,23,67,151,210 'broad':42 'call':4,19 'catalog':43 'categori':101 'challeng':194 'classif':118 'commit':79 'confirm':199 'connect':167 'content':173 'contract':147 'convers':135 'conversion' 'cost':58 'crawl':190 'crypto API payments' 'crypto-gas-estimates' 'data':47,52,104,108 'data-analytics' 'decim':217 'document':152,182 'embed':119 'enabl':36 'endpoint':45,57,82,138,198 'estim':129 'everi':56 'exampl':186 'exchang':124 'exchange-rates' 'export':109 'extrem':154 'feed':123 'financ':120 'finance-price-feeds' 'finance/web3':51 'four':99 'gas':128 'generat':136 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'x402-payment'","prices":[{"id":"d9086d4a-adb5-492c-b11b-e014aca4b9de","listingId":"468c954f-6632-4f0e-8ad7-319d64ee52d6","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/customers/90","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:51.068Z"}],"sources":[{"listingId":"468c954f-6632-4f0e-8ad7-319d64ee52d6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/90","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:51.068Z","lastSeenAt":"2026-04-22T21:30:30.844Z"}],"details":{"listingId":"468c954f-6632-4f0e-8ad7-319d64ee52d6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/90 \\\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":"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":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC (6 decimals = $0.02) on Base","source_url":"https://lowpaymentfee.com/api/v1/customers/90"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/customers/90"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time finance and crypto market data on a per-request payment basis","Running data analytics queries and exporting data with micropayments","Using utility services like geocoding and validation without subscriptions"],"bestFor":["Developers who want zero-commitment, pay-as-you-go API access","Agents and bots that can settle payments in USDC on Base via x402","Projects needing diverse API capabilities without managing API keys or rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.532Z"},"updatedAt":"2026-04-22T21:30:30.844Z"}}