{"id":"c9b25ca9-4911-46ec-8af3-d4eac2edce68","shortId":"PEKU2x","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, rate limits, or upfront commitments are required.\n\nThe specific endpoint at `/api/v1/generate/resource/30` is labeled \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made via the `exact` scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, with a 300-second timeout. The endpoint accepts HTTP POST 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 examples of what the endpoint actually returns. The landing page lists many endpoints but provides no detail on input parameters or output formats for any of them. As a result, it is unclear what data or functionality this specific resource endpoint provides beyond its generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","http-post","no-api-key","no-rate-limit"],"categories":["api","infrastructure"],"synonyms":["x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee","crypto pay api"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format","The endpoint name 'Premium API Access' and path '/api/v1/generate/resource/30' give no indication of actual functionality","Cannot verify what data or service is returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/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/v1/generate/resource/30","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response examples, and no explanation of what the endpoint actually does beyond the generic label 'Premium API Access'. The docs, pricing, and README pages are all 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'/api/v1/generate/resource/30':116 '/docs':173 '/pricing':174 '/readme':177 '/request':18,36 '0.02':17,35,88,136 '000':131 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':154 '20':130 '300':157 '6':141 'accept':162 'access':121,248 'actual':206 'address':153 'ai':12,30,57 'analysi':61 'analyt':11,29,51 'api':5,23,45,103,120,247 'application/json':167 'base':8,26,96,132,144 'base network api' 'beyond':243 'call':4,22 'categori':49 'challeng':126 'classif':64 'collect':40 'commit':109 'connect':183 'content':189 'convers':81 'cover':10,28 'crypto pay api' 'data':50,54,235 'decim':142 'detail':217 'document':168,198 'embed':65 'enabl':44 'endpoint':46,84,114,161,205,213,241 'estim':75 'exact':150 'exampl':201 'exchang':70 'export':55 'extrem':170 'feed':69 'financ':13,31,66 'format':223 'four':48 'function':237 'gas':74 'generat':82 'generic':245 'geocod':79 'http':163 'http-post' 'infrastructur':77 'input':219 'insight':56 'json-response' 'key':104 'label':118,249 'land':209 'learn':59 'limit':106 'list':211 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':58 'made':147 'mani':212 'metric':52 'micropayment api' 'network':97 'no-api-key' 'no-rate-limit' 'offer':38 'openapi':193 'output':222 'page':178,210 'paid':91 'paramet':220 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payment':145 'per':3,21,89 'post':164 'premium':119,246 'price':68,86 'prompt':185 'protocol':101 'provid':215,242 'quot':73 'rate':71,105 'render':180 'report':53 'request':90,127 'request/response':196 'requir':111 'resourc':240 'result':230 'return':123,166,207 'schema':197 'scheme':151 'second':158 'sentiment':60 'sinc':138 'span':47 'spars':171 'spec':194 'specif':113,239 'suit':6,24 'summar':63 'text':62 'timeout':159 'token':72 'unclear':233 'unit':133 'upfront':108 'usd':137 'usdc':9,27,93,135,139 'usdc api' 'usdc-base' 'use':140 'util':15,33,78 'valid':80 'via':98,148 'wallet':184 'web3':67 'x402':43,100,125 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"d9cf67dc-aa15-49f2-abf0-f6ccf4f127fd","listingId":"c9b25ca9-4911-46ec-8af3-d4eac2edce68","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/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":"2026-04-18T18:37:54.763Z"}],"sources":[{"listingId":"c9b25ca9-4911-46ec-8af3-d4eac2edce68","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/30","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:54.763Z","lastSeenAt":"2026-04-22T22:00:45.489Z"}],"details":{"listingId":"c9b25ca9-4911-46ec-8af3-d4eac2edce68","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/30\n# Returns 402 with x402 challenge; attach X-PAYMENT header with USDC payment proof on Base to access.","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 categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0.02 USD) on Base with exact scheme","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/30"}],"useCases":["Accessing premium API resources with per-call USDC micropayments on Base","Integrating pay-as-you-go API calls into agent workflows without API key management","Testing x402 protocol payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agent systems that need keyless, pay-per-call API access","Users who want to avoid subscription commitments for occasional API calls"],"notFor":["Production workloads requiring well-documented request/response schemas","Users who need free or fiat-only payment options","High-volume use cases where per-call pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.532Z"},"updatedAt":"2026-04-22T22:00:45.489Z"}}