{"id":"7be9b3e8-80b7-4977-bb2a-12a787fc9b9d","shortId":"5SJW2H","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API provider offering a broad catalog of pay-per-call endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/payments/379` is labeled \"Premium API Access\" and accepts POST requests with an x402 payment header. The x402 challenge indicates a max amount of 20,000 base units of USDC (0x8335…), which equals $0.02 per request (USDC uses 6 decimals).\n\nThe provider's landing page lists four 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 are advertised at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no actual technical documentation, request/response schemas, or usage examples. It is unclear what specific functionality the `/api/v1/payments/379` endpoint provides beyond the generic \"Premium API Access\" label, and there is no OpenAPI spec or output schema available. The endpoint is live and returns a valid x402 challenge, but the lack of documentation makes it difficult to determine what data or service is actually returned after payment.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","analytics-api","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","data-export"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all show only 'Connect wallet' with no content","No OpenAPI or output schema provided; request and response formats are unknown","The specific purpose of /api/v1/payments/379 ('Premium API Access') is unclear — it may be a generic or placeholder endpoint","Cannot verify what data or service is delivered after payment is made"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/379","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/payments/379","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 accepts USDC payments on Base at $0.02/request. However, there is no OpenAPI spec, no documentation beyond a wallet-connect prompt, no request/response schema, and no clarity on what this specific endpoint actually returns. Effectively a stub 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'/api/v1/payments/379':62,199 '/docs':169 '/pricing':171 '/readme':173 '/request':16,32 '0.02':15,31,94,149 '000':86 '0x8335':91 '20':85 '402 payment api' '6':99 'accept':69 'access':67,207 'actual':184,244 'advertis':147 'ai':9,25,118 'ai-inference' 'amount':83 'analysi':122 'analyt':8,24,112 'analytics-api' 'api':4,20,39,66,110,154,206 'avail':218 'base':7,23,56,87 'base network api' 'base-network' 'beyond':202 'broad':43 'call':49 'catalog':44 'categori':108 'challeng':79,228 'classif':125 'classification' 'commit':162 'connect':179 'convers':142 'data':111,115,240 'data-export' 'decim':100 'determin':238 'difficult':236 'document':164,186,233 'embed':126 'embeddings' 'endpoint':13,29,50,60,145,200,220 'equal':93 'estim':136 'exampl':191 'exchang':131 'export':116 'extrem':166 'feed':130 'financ':10,26,127 'finance-data' 'four':107 'function':197 'gas':135 'gate':3,19 'generat':143 'generic':204 'geocod':140 'geocoding' 'header':76 'indic':80 'infrastructur':138 'insight':117 'key':155 'label':64,208 'lack':231 'land':104 'learn':120 'limit':158 'list':106 'live':222 'low payment fee' 'lowpaymentfee.com':33 'machin':119 'make':234 'max':82 'metric':113 'micropayment api' 'minimum':161 'network':57 'offer':41 'openapi':213 'output':216 'page':105,174 'pay':47 'pay per call api' 'pay-per-cal':46 'pay-per-request' 'payment':75,247 'per':48,95,150 'post':70 'premium':65,205 'price':129 'prompt':181 'protocol':38 'provid':40,102,201 'quot':134 'rate':132,157 'render':176 'report':114 'request':71,96,151 'request/response':187 'requir':163 'return':224,245 'schema':188,217 'sentiment':121 'sentiment-analysis' 'servic':242 'settl':51 'spars':167 'spec':214 'specif':59,196 'suit':5,21 'summar':124 'technic':185 'text':123 'text-summarization' 'token':133 'unclear':194 'unit':88 'usag':190 'usdc':53,90,97 'usdc api' 'usdc-settlement' 'use':98 'util':12,28,139 'valid':141,226 'wallet':180 'web3':128 'x402':2,18,37,74,78,227 'x402 api' 'x402-gated':1,17 'x402-payment' 'x402-protocol':36","prices":[{"id":"80d3ea24-edef-4b53-a7ae-3ef501809d0c","listingId":"7be9b3e8-80b7-4977-bb2a-12a787fc9b9d","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/payments/379","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:42.272Z"}],"sources":[{"listingId":"7be9b3e8-80b7-4977-bb2a-12a787fc9b9d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/379","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:42.272Z","lastSeenAt":"2026-04-22T21:31:10.191Z"}],"details":{"listingId":"7be9b3e8-80b7-4977-bb2a-12a787fc9b9d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/379 \\\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":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/379"},{"claim":"All listed endpoints are 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":"The provider offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running analytics queries and data exports with instant crypto-settled micropayments","Geocoding and data validation via utility endpoints"],"bestFor":["Agents or developers wanting zero-signup, pay-per-use API access","Crypto-native applications that can settle USDC on Base","Low-volume or bursty workloads where per-request pricing is more economical than subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where $0.02/request adds up significantly","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.309Z"},"updatedAt":"2026-04-22T21:31:10.191Z"}}