{"id":"45c7332a-1a6c-4188-b422-0ea0f0837f95","shortId":"hu2WaN","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 hosts a collection of x402-protocol pay-per-call API endpoints settled in USDC on the Base network. The specific resource at `/api/v1/generate/resource/172` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0.02 USD) per call. The site advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header to each request.\n\nThe broader platform offers endpoints across four categories: 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 listed endpoints share the same $0.02/request pricing.\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. The endpoint is confirmed live (402 challenge captured), but without documentation it is unclear what inputs the `/api/v1/generate/resource/172` endpoint expects or what it returns beyond `application/json`.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","data-analytics","ai-inference","finance-data","utility-services"],"categories":["general","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","serverless API","metered API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all render only 'Connect wallet'","No OpenAPI or schema definition; request format and response structure are unknown","The specific function of /api/v1/generate/resource/172 is unclear; 'Premium API Access' is a generic label","Cannot verify that advertised AI, finance, or analytics endpoints actually return meaningful data"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/172","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/generate/resource/172","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, documentation is effectively nonexistent — no OpenAPI spec, no request/response schemas, no examples, and all doc pages show only 'Connect wallet'. The purpose of this specific resource (/api/v1/generate/resource/172) is unknown beyond the generic label 'Premium API 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'/api/v1/generate/resource/172':58,207 '/docs':160 '/pricing':162 '/readme':164 '/request':16,32,153 '0.02':15,31,79,152 '000':74 '20':73 '402':195 'Base network API' 'USDC micropayment API' 'access':64,94 'across':110 'advertis':85 'ai':9,25,120 'ai-inference' 'analysi':124 'analyt':8,24,114 'api':4,20,45,63,87 'application/json':215 'attach':97 'base':7,23,52,75 'base-network' 'beyond':214 'broader':106 'call':44,82 'caller':95 'captur':197 'categori':112 'challeng':69,196 'classif':127 'collect':36 'confirm':193 'connect':170 'content':176 'convers':144 'crypto-paid API' 'data':113,117 'data-analytics' 'document':155,185,200 'embed':128 'endpoint':13,29,46,109,148,191,208 'estim':138 'exampl':189 'exchang':133 'expect':209 'export':118 'extrem':157 'feed':132 'financ':10,26,129 'finance-data' 'four':111 'gas':137 'gate':3,19 'generat':145 'geocod':142 'header':101 'host':34 'infrastructur':140 'input':205 'insight':119 'instant':93 'json-response' 'key':88 'learn':122 'limit':91 'list':60,147 'live':194 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':121 'metered API' 'metric':115 'network':53 'no-api-key' 'offer':108 'openapi':180 'page':165 'pay':42 'pay-per-cal':41 'pay-per-call API' 'pay-per-request' 'payment':100 'per':43,81 'platform':107 'premium':62 'price':131,154 'prompt':172 'protocol':40 'quot':136 'rate':90,134 'render':167 'report':116 'request':70,104 'request/response':183 'resourc':56 'return':66,213 'schema':184 'sentiment':123 'serverless API' 'settl':47 'share':149 'simpli':96 'site':84 'spars':158 'spec':181 'specif':55 'suit':5,21 'summar':126 'text':125 'token':135 'unclear':203 'unit':76 'usag':188 'usd':80 'usdc':49,78 'usdc-settlement' 'util':12,28,141 'utility-services' 'valid':143 'wallet':171 'web3':130 'without':199 'x402':2,18,39,68,99 'x402 API' 'x402-gated':1,17 'x402-payment' 'x402-protocol':38","prices":[{"id":"08b0faee-9bcb-4fc9-8c97-e982007e9bcb","listingId":"45c7332a-1a6c-4188-b422-0ea0f0837f95","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/generate/resource/172","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:26.961Z"}],"sources":[{"listingId":"45c7332a-1a6c-4188-b422-0ea0f0837f95","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/172","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:26.961Z","lastSeenAt":"2026-04-22T12:03:12.705Z"}],"details":{"listingId":"45c7332a-1a6c-4188-b422-0ea0f0837f95","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/172 \\\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 an x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/172"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Pay-per-call data retrieval for analytics, finance, or utility tasks","AI inference (sentiment, summarization, classification, embeddings) settled in USDC on Base"],"bestFor":["Autonomous agents with Base USDC wallets needing frictionless API access","Developers prototyping with low-cost, no-commitment API calls","Web3-native applications that prefer on-chain payment over subscription billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where $0.02/request adds up and bulk pricing is preferred","Callers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.896Z"},"updatedAt":"2026-04-22T12:03:12.705Z"}}