{"id":"dfd2db81-70d8-49e7-8a23-d6e6acf3d11f","shortId":"xPBJKs","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a collection of endpoints spanning data analytics, AI/ML inference, finance/crypto market data, and general utility services. All endpoints are paid per-request using USDC on the Base network via the x402 protocol, with no API keys, rate limits, or subscriptions required.\n\nThe specific endpoint at `/api/resource/30` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). The broader platform advertises a uniform $0.02/request pricing across all its endpoints, which include sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more.\n\nDocumentation 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 usage examples available from the crawled material. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what request body `/api/resource/30` expects or what response it returns. The platform appears to be a demonstration or early-stage deployment of x402 micropayments.","tags":[],"capabilities":["x402-payment","per-request-pricing","usdc-base","post-endpoint","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding"],"categories":["api-platform","llm","finance","geo"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API","Base network API","lowpaymentfee","crypto-paid API","no-auth API"],"warnings":["No OpenAPI or schema documentation available — request/response formats for /api/resource/30 are completely unknown","All documentation pages (/docs, /pricing, /README, /api) return only a 'Connect wallet' prompt with no usable content","The endpoint path '/api/resource/30' does not match any of the advertised API paths on the landing page (e.g., /api/v1/*, /api/v2/*), so its actual function is unclear","Platform appears to be early-stage or a demo; no evidence of production-grade reliability or support"],"endpointUrl":"https://lowpaymentfee.com/api/resource/30","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/resource/30","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response documentation, no examples, and all doc pages render only 'Connect wallet'. The specific purpose of /api/resource/30 is unknown beyond the generic label 'Premium API Access'. This is effectively a stub 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'/api/resource/30':95,221 '/docs':167 '/pricing':169 '/readme':171 '/request':19,38,140 '0.02':18,37,126,139 '000':115 '0x8335':120 '20':114 '2913':121 '402':210 '6':131 'Base network API' 'USDC API' 'accept':103 'access':101 'across':142 'advertis':136 'ai':12,31 'ai-inference' 'ai/ml':56 'analysi':149 'analyt':55 'api':5,24,45,84,100 'appear':230 'avail':197 'base':8,27,76,116,123 'bodi':220 'broader':134 'call':4,23,128 'challeng':108,211 'classif':152 'classification' 'collect':50 'confirm':205 'connect':177 'content':183 'cost':112 'crawl':200 'crypto-paid API' 'data':11,30,54,60 'data-analytics' 'decim':132 'demonstr':234 'deploy':239 'document':162,192,214 'earli':237 'early-stag':236 'embed':153 'embeddings' 'enabl':44 'endpoint':16,35,52,66,93,145,203 'equal':125 'exampl':196 'exchang':156 'expect':222 'extrem':164 'feed':155 'financ':13,32 'finance-data' 'finance/crypto':58 'general':62 'geocod':158 'geocoding' 'includ':147 'indic':109 'infer':57 'key':85 'limit':87 'list':97 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'x402-payment'","prices":[{"id":"80e00a35-29ca-494a-8b5e-65e9d226a988","listingId":"dfd2db81-70d8-49e7-8a23-d6e6acf3d11f","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/resource/30","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:06.532Z"}],"sources":[{"listingId":"dfd2db81-70d8-49e7-8a23-d6e6acf3d11f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/30","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:06.532Z","lastSeenAt":"2026-04-23T17:31:10.926Z"}],"details":{"listingId":"dfd2db81-70d8-49e7-8a23-d6e6acf3d11f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/30 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","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, no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoint categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/resource/30"},{"claim":"Documentation pages render only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto/finance data (token quotes, gas estimates, exchange rates) on a per-call basis","Running utility operations (geocoding, validation, conversion) with instant micropayments","Integrating pay-per-use endpoints into autonomous agent workflows via x402"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost micropayment-gated endpoints without subscriptions"],"notFor":["Users who need detailed API documentation and request/response schemas before integrating","High-volume production workloads requiring SLAs, rate limit guarantees, or support contracts","Developers without access to USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.886Z"},"updatedAt":"2026-04-23T17:31:10.926Z"}}