{"id":"5fa28d2d-a254-43a5-8427-6e4932a28e18","shortId":"kKgFgw","kind":"x402","title":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base via x402 — data, AI, 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-request 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, paid in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/transfers/141` is listed as \"Premium API Access\" and advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made inline via the X-PAYMENT header — no API keys, accounts, or rate limits are required. The x402 challenge confirms the endpoint is live, accepts POST requests, and returns application/json.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the \"Premium API Access\" endpoint actually returns. The platform's value proposition centers on simplicity and low friction, but the lack of documentation makes it difficult to know what data or functionality each endpoint provides without making a paid request.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","exchange-rates","geocoding","crypto-gas-estimates"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api access","lowpaymentfee"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition found for any endpoint","The specific endpoint '/api/v1/transfers/141' has a generic 'Premium API Access' description with no indication of what it does or returns","Cannot verify what data or functionality is actually delivered after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/141","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/transfers/141","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 confirms pricing and payment details, but there is zero documentation on what this specific endpoint (or any endpoint) actually returns. No OpenAPI spec, no request/response schemas, no examples. The docs, pricing, and README pages are all blank beyond a wallet connect prompt. The listing is effectively a stub with confirmed 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'/api/v1/transfers/141':117 '/docs':185 '/pricing':186 '/readme':189 '/request':19,38 '0.02':18,37,99,142 '000':131 '0x8335':136 '20':130 '2913':137 'accept':170 'access':123,220 'account':156 'across':58 'actual':222 'addit':200 'advertis':125 'ai':12,31,68 'ai-inference' 'amount':128 'analysi':72 'analyt':62 'api':5,24,45,122,154,219 'application/json':175 'base':8,27,107,132,139 'base network api' 'beyond':177 'broad':50 'call':4,23 'catalog':51 'categori':60 'center':229 'challeng':164 'classif':75 'classification' 'confirm':165 'connect':195 'content':202 'convers':92 'crypto-gas-estimates' 'data':11,30,61,65,246 'data-analytics' 'difficult':242 'document':176,211,239 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,115,167,221,250 'equal':141 'estim':86 'exampl':214 'exchang':81 'exchange-rates' 'export':66 'extrem':182 'feed':80 'financ':13,32,77 'finance-data' 'four':59 'friction':234 'function':248 'gas':85 'generat':93 'geocod':90 'geocoding' 'header':152 'infrastructur':88 'inlin':146 'insight':67 'key':155 'know':244 'lack':237 'land':179 'learn':70 'limit':159 'list':119 'live':169 'low':233 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':69 'made':145 'make':240,253 'max':127 'metric':63 'micropayment api' 'network':108 'offer':48 'openapi':206 'page':180,190 'paid':102,255 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':143,151 'per':3,22,55,100 'platform':6,25,46,225 'post':171 'premium':121,218 'price':79,97 'prompt':197 'proposit':228 'protocol':112 'provid':251 'quot':84 'rate':82,158 'render':192 'report':64 'request':56,101,172,256 'request/response':209 'requir':161 'return':174,223 'schema':210 'sentiment':71 'sentiment-analysis' 'simplic':231 'spars':183 'spec':207 'specif':114 'summar':74 'technic':201 'text':73 'text-summarization' 'token':83 'unit':133 'usdc':104,135 'usdc api access' 'usdc-base' 'util':15,34,89 'valid':91 'valu':227 'via':9,28,109,147 'wallet':196 'web3':78 'without':252 'x':150 'x-payment':149 'x402':10,29,43,111,163 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"f00acc0f-c8fa-47f7-ba8d-87048cb42434","listingId":"5fa28d2d-a254-43a5-8427-6e4932a28e18","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/transfers/141","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:30.082Z"}],"sources":[{"listingId":"5fa28d2d-a254-43a5-8427-6e4932a28e18","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/141","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:30.082Z","lastSeenAt":"2026-04-22T16:32:16.476Z"}],"details":{"listingId":"5fa28d2d-a254-43a5-8427-6e4932a28e18","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/141 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/transfers/141"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time crypto price feeds, exchange rates, and gas estimates on a per-call basis","Running geocoding, validation, or data conversion tasks with instant pay-per-use billing","Exporting data or pulling analytics metrics without subscription commitments"],"bestFor":["Agents or developers who want zero-signup, pay-per-call API access","Use cases requiring low-cost micropayments ($0.02/call) on Base L2","Prototyping or low-volume usage where subscriptions are overkill"],"notFor":["High-volume production workloads where per-call pricing adds up quickly","Users who need detailed API documentation, schemas, or SLAs before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.923Z"},"updatedAt":"2026-04-22T16:32:16.476Z"}}