{"id":"14657cce-46e2-4dee-8e6e-864511c91034","shortId":"zag3B2","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are settled on the Base network using USDC, with a uniform price of $0.02 per request. The platform requires no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/trades/128` is listed as \"Premium API Access\" and returns `application/json` via POST. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, 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 examples of what the `/api/v1/trades/128` endpoint actually returns. The endpoint name suggests trade-related data (possibly a specific trade record), but this is speculative based solely on the URL path.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-api","no-api-key","trades-data"],"categories":["finance","data"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API","Base network API","trade data API","lowpaymentfee"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The specific purpose of /api/v1/trades/128 is unknown — 'Premium API Access' is generic","No request body schema or response schema documented anywhere","Cannot verify what data this endpoint actually returns without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/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/trades/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 works. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no examples. The actual functionality of /api/v1/trades/128 is unclear — the description is just 'Premium API Access' with no detail on what data it returns or what inputs it 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'/api/v1/trades/128':105,195 '/docs':163 '/pricing':165 '/readme':167 '/request':13,28 '0.02':12,27,75,136 '000':125 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':148 '0x8335':130 '20':124 '2913':131 '300':151 '6':140 'Base network API' 'USDC API' 'access':7,22,111 'actual':197 'address':147 'advertis':120 'ai/ml':53 'analyt':52 'api':6,21,37,82,110 'application/json':114 'attach':93 'base':9,24,66,126,133,216 'base-network' 'beyond':155 'broad':42 'call':4,19 'caller':91 'catalog':43 'challeng':119 'commit':90 'connect':173 'content':179 'data':51,56,206 'decim':141 'document':154,188 'enabl':36 'endpoint':49,61,103,196,200 'equal':135 'exampl':191 'extrem':160 'finance/web3':55 'given':137 'header':97 'infer':54 'json-api' 'key':83 'land':157 'limit':86 'list':107 'lowpaymentfee' 'lowpaymentfee.com':31 'maxamountrequir':122 'micropayment API' 'name':201 'network':67 'no-api-key' 'offer':40 'openapi':183 'page':158,168 'path':221 'pay':2,17,46 'pay-per-cal':1,16 'pay-per-call API' 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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/trades/128","description":"Premium API 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<x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Uniform pricing of $0.02 per request across all endpoints","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge with maxAmountRequired of 20000 base units USDC on Base, 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/trades/128"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/128"}],"useCases":["Fetching trade data or records on a per-call basis without subscription","Agent-driven programmatic access to premium API endpoints with crypto micropayments","Integrating pay-as-you-go data retrieval into Web3 workflows"],"bestFor":["Developers wanting no-signup, no-API-key access to premium endpoints","AI agents that can settle x402 payments autonomously on Base","Users who prefer per-request pricing over monthly subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.747Z"},"updatedAt":"2026-04-26T09:33:34.534Z"}}