{"id":"68015a5f-519f-4ce3-bccc-9b64f10f8062","shortId":"d97j5N","kind":"x402","title":"x402-payable API suite on Base: AI, analytics, finance, and utility endpoints at $0.02/request.","tagline":"x402-payable API suite on Base: AI, analytics, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-call 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 endpoints are priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/generate/resource/190` is listed under \"Premium API Access.\" Its x402 challenge confirms it is live and accepts payment via the exact scheme on Base, with a maxAmountRequired of 20,000 base units of USDC (0.02 USDC, i.e., $0.02). Payment is made via the X-PAYMENT header with no API keys or rate limits required. The endpoint accepts HTTP POST requests and returns application/json.\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 example payloads available. The exact functionality behind \"Premium API Access\" at resource/190 is not described beyond its title, making it unclear what this specific endpoint generates or returns. The platform advertises no API keys, no rate limits, and instant access as features.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","http-post","json-response","no-api-key","no-rate-limits"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","micropayment API","USDC API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet'","No OpenAPI spec or request/response schema provided","The exact functionality of /api/v1/generate/resource/190 ('Premium API Access') is undocumented","Cannot verify what data or output this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/190","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/190","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what this specific endpoint does, no request/response schemas, no examples, and all doc pages render only 'Connect wallet'. The listing is effectively a stub with confirmed 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'/api/v1/generate/resource/190':107 '/docs':175 '/pricing':176 '/readme':179 '/request':16,32 '0.02':15,31,93,140,143 '000':135 '20':134 'Base network API' 'USDC API' 'accept':122,163 'access':113,212,242 'across':52 'advertis':233 'ai':8,24,62 'analysi':66 'analyt':9,25,56 'api':4,20,39,112,155,211,235 'application/json':169 'avail':205 'base':7,23,101,129,136 'base-network' 'behind':209 'beyond':218 'broad':44 'call':50 'catalog':45 'categori':54 'challeng':116 'classif':69 'confirm':117 'connect':185 'content':191 'convers':86 'crypto-paid API' 'data':55,59 'describ':217 'document':170,200 'embed':70 'enabl':38 'endpoint':13,29,51,89,105,162,227 'estim':80 'exact':126,207 'exampl':203 'exchang':75 'export':60 'extrem':172 'featur':244 'feed':74 'financ':10,26,71 'four':53 'function':208 'gas':79 'generat':87,228 'geocod':84 'header':152 'http':164 'http-post' 'i.e':142 'infrastructur':82 'insight':61 'instant':241 'json-response' 'key':156,236 'learn':64 'limit':159,239 'list':109 'live':120 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':63 'made':146 'make':221 'maxamountrequir':132 'metric':57 'micropayment API' 'network':102 'no-api-key' 'no-rate-limits' 'offer':42 'openapi':195 'page':180 'pay':48 'pay-per-cal':47 'pay-per-call API' 'pay-per-request' 'payabl':3,19 'payload':204 'payment':123,144,151 'per':49,94 'platform':40,232 'post':165 'premium':111,210 'premium API access' 'price':73,91 'prompt':187 'quot':78 'rate':76,158,238 'render':182 'report':58 'request':95,166 'request/response':198 'requir':160 'resource/190':214 'return':168,230 'schema':199 'scheme':127 'sentiment':65 'settl':96 'spars':173 'spec':196 'specif':104,226 'suit':5,21 'summar':68 'text':67 'titl':220 'token':77 'unclear':223 'unit':137 'usdc':98,139,141 'usdc-settlement' 'util':12,28,83 'valid':85 'via':124,147 'wallet':186 'web3':72 'x':150 'x-payment':149 'x402':2,18,37,115 'x402 API' 'x402-enabled':36 'x402-payable':1,17 'x402-payment'","prices":[{"id":"4eb86b20-e7c5-4158-afcf-df2782b5019c","listingId":"68015a5f-519f-4ce3-bccc-9b64f10f8062","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/190","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:41.472Z"}],"sources":[{"listingId":"68015a5f-519f-4ce3-bccc-9b64f10f8062","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/190","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:41.472Z","lastSeenAt":"2026-04-24T23:02:33.071Z"}],"details":{"listingId":"68015a5f-519f-4ce3-bccc-9b64f10f8062","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/190 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge confirms live endpoint accepting USDC on Base with maxAmountRequired of 20000 base units (0.02 USDC)","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/190"},{"claim":"Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Paying per-call for utility or generation tasks settled in USDC on Base","Programmatic access to a multi-category API suite with uniform pricing"],"bestFor":["AI agents that can settle x402 payments in USDC on Base","Developers wanting zero-signup, pay-as-you-go API access","Low-volume or bursty workloads where flat per-request pricing is convenient"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads requiring bulk pricing or rate guarantees","Anyone unable to pay with USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.227Z"},"updatedAt":"2026-04-24T23:02:33.071Z"}}