{"id":"e43d3fbc-16b4-4c74-a792-1920e26bf802","shortId":"fqcWhx","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com offers a collection of x402-enabled API endpoints spanning 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, paid in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint at `/api/v1/generate/resource/60` is listed under \"Premium API Access.\" The x402 challenge confirms it is live, accepting POST requests and settling payments in USDC (contract 0x8335…2913 on Base) to address 0x1A2B…85F3. The maxAmountRequired of 20000 base units corresponds to $0.02 (USDC uses 6 decimals). The endpoint returns application/json responses with a 300-second payment timeout.\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 usage examples available. The exact functionality behind \"Premium API Access\" and the \"/generate/resource/60\" path is unclear from the available material. Prospective users should expect to experiment or contact the provider for details on what this endpoint actually generates.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","post-method","no-api-key","analytics","ai-inference","finance-data","utility-services"],"categories":["general","llm","finance","geo"],"synonyms":["x402 API","micropayment API","pay-per-call","USDC API","Base network API","lowpaymentfee","crypto-paid API","serverless 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/60' ('Premium API Access') is unknown from available material","No information on uptime, SLAs, or rate limits beyond the marketing claim of 'no rate limits'"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/60","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/60","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 the endpoint actually does, no request/response schemas, no examples, and all doc pages render only 'Connect wallet'. The listing is effectively a 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'/api/v1/generate/resource/60':116 '/docs':176 '/generate/resource/60':216 '/pricing':177 '/readme':180 '/request':18,36 '0.02':17,35,88,155 '0x1a2b':145 '0x8335':139 '20000':150 '2913':140 '300':167 '6':158 '85f3':146 'Base network API' 'USDC API' 'accept':130 'access':122,213 'actual':240 'address':144 'ai':12,30,57 'ai-inference' 'analysi':61 'analyt':11,29,51 'analytics' 'api':5,23,45,103,121,212 'application/json':163 'avail':206,222 'base':8,26,96,142,151 'behind':210 'call':4,22 'categori':49 'challeng':125 'classif':64 'collect':40 'commit':111 'confirm':126 'connect':186 'contact':231 'content':192 'contract':138 'convers':81 'correspond':153 'cover':10,28 'crypto-paid API' 'data':50,54 'decim':159 'detail':235 'document':171,201 'embed':65 'enabl':44 'endpoint':46,84,114,161,239 'estim':75 'exact':208 'exampl':205 'exchang':70 'expect':227 'experi':229 'export':55 'extrem':173 'feed':69 'financ':13,31,66 'finance-data' 'four':48 'function':209 'gas':74 'generat':82,241 'geocod':79 'infrastructur':77 'insight':56 'json-api' 'key':104 'learn':59 'limit':107 'list':118 'live':129 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':58 'materi':223 'maxamountrequir':148 'metric':52 'micropayment API' 'network':97 'no-api-key' 'offer':38 'openapi':196 'page':181 'paid':91 'path':217 'pay':2,20 'pay-per-cal':1,19 'pay-per-call' 'pay-per-request' 'payment':135,169 'per':3,21,89 'post':131 'post-method' 'premium':120,211 'price':68,86 'prompt':188 'prospect':224 'protocol':101 'provid':233 'quot':73 'rate':71,106 'render':183 'report':53 'request':90,132 'request/response':199 'respons':164 'return':162 'schema':200 'second':168 'sentiment':60 'serverless API' 'settl':134 'span':47 'spars':174 'spec':197 'specif':113 'suit':6,24 'summar':63 'text':62 'timeout':170 'token':72 'unclear':219 'unit':152 'upfront':110 'usag':204 'usdc':9,27,93,137,156 'usdc-base' 'use':157 'user':225 'util':15,33,78 'utility-services' 'valid':80 'via':98 'wallet':187 'web3':67 'x402':43,100,124 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"94df739b-08bc-44f4-aa66-bb844b995f41","listingId":"e43d3fbc-16b4-4c74-a792-1920e26bf802","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/60","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:14.047Z"}],"sources":[{"listingId":"e43d3fbc-16b4-4c74-a792-1920e26bf802","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/60","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:14.047Z","lastSeenAt":"2026-04-22T12:03:16.582Z"}],"details":{"listingId":"e43d3fbc-16b4-4c74-a792-1920e26bf802","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/60 \\\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":"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":"Endpoint is live, returning 402 with x402 challenge; maxAmountRequired=20000 USDC base units on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/60"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/60"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Paying per-call for AI inference tasks like sentiment analysis or text summarization","Fetching real-time financial data (prices, exchange rates, gas estimates) with crypto micropayments","Running utility operations (geocoding, validation, conversion) on a pay-as-you-go basis"],"bestFor":["Developers and agents wanting zero-signup, pay-per-use API access","Crypto-native workflows that can settle USDC on Base","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["High-volume production workloads needing SLAs and guaranteed uptime (no documentation on reliability)","Users who need detailed API documentation or request/response schemas before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.554Z"},"updatedAt":"2026-04-22T12:03:16.582Z"}}