{"id":"3d9c49f3-ff03-4023-8e5e-a20e04596308","shortId":"HPcvkf","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no upfront commitments — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe specific endpoint at `/api/v1/generate/resource/2` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge confirms it is live, requesting up to 20,000 base units of USDC (0.02 USDC, i.e., $0.02) on Base (asset contract 0x8335…2913). The response MIME type is application/json. However, the exact functionality behind this particular resource path is not documented — the landing page groups it under a generic \"Generation\" utility category but provides no schema, parameter descriptions, or example responses.\n\nThe broader platform advertises 16+ endpoints across four categories: Data & Analytics (metrics, reports, export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation). All share the same $0.02 flat pricing. Documentation pages beyond the landing page returned only a \"Connect wallet\" stub, so detailed request/response schemas are unavailable.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","json-api","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-generation"],"categories":["llm","data","finance","utility"],"synonyms":["low payment fee API","x402 API","pay per call API","USDC micropayment API","Base network API","crypto pay API","402 payment required API","lowpaymentfee"],"warnings":["No documentation available — all doc/pricing/README pages return only a 'Connect wallet' stub with no content.","The exact functionality of /api/v1/generate/resource/2 is undocumented; 'Premium API Access' is a generic label.","No request parameters or response schema are provided anywhere.","The platform lists 16+ endpoints but none have detailed specs; treat advertised capabilities with caution."],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/2","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/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and no examples for this or any endpoint. All doc pages return only 'Connect wallet' stubs. The exact purpose of '/api/v1/generate/resource/2' is 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'/request':19,38 '0.02':18,37,68,140,143,232 '000':135 '0x8335':148 '16':192 '20':134 '2913':149 '402 payment required API' 'Base network API' 'USDC micropayment API' 'accept':121 'access':119 'across':194 'advertis':191 'ai':12,31,203 'ai-inference' 'ai/ml':57 'analysi':207 'analyt':56,198 'api':5,24,45,86,118 'application/json':155 'asset':146 'attach':97 'base':8,27,76,136,145 'behind':160 'beyond':237 'broad':50 'broader':189 'call':4,23 'caller':95 'categori':178,196 'challeng':126 'classif':210 'classification' 'collect':51 'commit':94 'confirm':127 'connect':244 'contract':147 'convers':226 'cost':67 'cover':10,29 'crypto pay API' 'crypto-quotes' 'data':11,30,55,60,197 'data-analytics' 'descript':184 'detail':248 'document':167,235 'embed':211 'embeddings' 'enabl':44 'endpoint':16,35,53,66,111,193 'estim':221 'everi':65 'exact':158 'exampl':186 'exchang':216 'export':201 'feed':215 'financ':13,32,212 'finance-data' 'finance/web3':59 'flat':233 'four':195 'function':159 'gas':220 'general':62 'generat':176,227 'generic':175 'geocod':224 'geocoding' 'group':171 'header':102 'howev':156 'i.e':142 'infer':58 'infrastructur':223 'insight':202 'json-api' 'key':87 'land':169,239 'learn':205 'limit':90 'list':115 'live':130 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':204 'metric':199 'mime':152 'network':77 'offer':48 'page':170,236,240 'paid':71 'paramet':183 'particular':162 'path':164 'pay':2,21 'pay per call API' 'pay-per-cal':1,20 'pay-per-request' 'payment':81,101,107 'per':3,22,69 'platform':46,190 'post':122 'premium':117 'price':214,234 'proof':108 'protocol':82 'provid':180 'quot':219 'rate':89,217 'report':200 'request':70,123,131 'request/response':249 'resourc':163 'respons':151,187 'return':241 'schema':182,250 'sentiment':206 'sentiment-analysis' 'servic':64 'share':229 'simpli':96 'span':54 'specif':110 'stub':246 'suit':6,25 'summar':209 'text':208 'text-summarization' 'token':218 'type':153 'unavail':252 'unit':137 'upfront':93 'usdc':9,28,73,139,141 'usdc-base' 'util':15,34,63,177 'utility-generation' 'valid':105,225 'via':78 'wallet':245 'web3':213 'x':100 'x-payment':99 'x402':43,80,106,125 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"4e737514-ad32-4acb-8433-3eaa7c7052bc","listingId":"3d9c49f3-ff03-4023-8e5e-a20e04596308","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/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:23.761Z"}],"sources":[{"listingId":"3d9c49f3-ff03-4023-8e5e-a20e04596308","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/2","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:23.761Z","lastSeenAt":"2026-04-23T21:31:44.880Z"}],"details":{"listingId":"3d9c49f3-ff03-4023-8e5e-a20e04596308","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/2 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/generate/resource/2","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402_payment_proof>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/generate/resource/2 requests maxAmountRequired of 20000 base units of USDC (0.02 USDC) on Base.","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/2"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no substantive content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key provisioning","Fetching real-time crypto token quotes and gas estimates with per-call billing","Running geocoding or data conversion tasks with zero upfront cost","Exporting analytics data or generating reports on a pay-as-you-go basis"],"bestFor":["AI agents that need keyless, pay-per-call access to diverse utility endpoints","Developers prototyping with low-cost, no-commitment API access on Base","Web3-native applications that prefer on-chain USDC settlement over traditional billing"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.076Z"},"updatedAt":"2026-04-23T21:31:44.880Z"}}