{"id":"6a70fba4-c5bd-4ebc-9c59-74a821b430dc","shortId":"RJxGMB","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides 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, payable in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/messages/67` is listed as \"Premium API Access\" and its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…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 platform emphasizes simplicity: pay only for what you use with no minimums or commitments.\n\nNote that while the landing page lists many endpoints, the actual functionality behind `/api/v1/messages/67` is not well documented — the name \"Premium API Access\" and the path segment \"messages/67\" suggest a messaging or content retrieval endpoint, but no schema, example request, or example response is available. The broader platform also lacks public OpenAPI specs, detailed documentation pages, or usage examples, so the exact behavior of each endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The purpose of /api/v1/messages/67 ('Premium API Access') is unclear — no description of inputs or outputs","No example requests or responses are provided anywhere on the site","Pricing and /README pages return only a 'Connect wallet' prompt with no content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/67","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/messages/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/messages/67 is ambiguous. Effectively a stub with verified 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'/request':19,38 '0.02':18,37,99,142 '000':132 '0x8335':137 '20':131 'access':122,199 'account':156 'across':58 'actual':187 'advertis':127 'ai':12,31,68 'ai-inference' 'also':225 'analysi':72 'analyt':62 'api':5,24,45,121,154,198 'avail':221 'base':8,27,107,133,139 'base network api' 'behavior':239 'behind':189 'broad':50 'broader':223 'call':4,23 'catalog':51 'categori':60 'challeng':126 'classif':75 'classification' 'commit':176 'content':209 'convers':92 'crypto-quotes' 'data':11,30,61,65 'data-analytics' 'detail':230 'document':194,231 'embed':76 'embeddings' 'emphas':164 'enabl':44 'endpoint':16,35,57,95,115,185,211,242 'equal':141 'estim':86 'exact':238 'exampl':215,218,235 'exchang':81 'export':66 'feed':80 'financ':13,32,77 'finance-data' 'four':59 'function':188 'gas':85 'generat':93 'geocod':90 'geocoding' 'header':152 'infrastructur':88 'inlin':146 'insight':67 'key':155 'lack':226 'land':181 'learn':70 'limit':159 'list':118,183 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':69 'made':145 'mani':184 'maxamountrequir':129 'messag':207 'messages/67':204 'metric':63 'micropayment api' 'minimum':174 'name':196 'network':108 'note':177 'offer':10,29 'openapi':228 'page':182,232 'path':202 'pay':2,21,54,166 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payabl':102 'payment':143,151 'per':3,22,55,100 'platform':6,25,46,163,224 'premium':120,197 'price':79,97 'protocol':112 'provid':48 'public':227 'quot':84 'rate':82,158 'remain':243 'report':64 'request':56,101,216 'requir':161 'respons':219 'retriev':210 'schema':214 'segment':203 'sentiment':71 'sentiment-analysis' 'simplic':165 'spec':229 'specif':114 'suggest':205 'summar':74 'text':73 'text-summarization' 'token':83 'unclear':244 'unit':134 'usag':234 'usdc':9,28,104,136 'usdc api' 'usdc-base' 'use':171 'util':15,34,89 'utility-apis' 'valid':91 'via':109,147 'web3':78 'well':193 'x':150 'x-payment':149 'x402':43,111,125 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"5f0df4ae-a8b1-4730-b04f-c0deca6dc125","listingId":"6a70fba4-c5bd-4ebc-9c59-74a821b430dc","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/messages/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.001Z"}],"sources":[{"listingId":"6a70fba4-c5bd-4ebc-9c59-74a821b430dc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/67","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.001Z","lastSeenAt":"2026-04-22T02:32:08.067Z"}],"details":{"listingId":"6a70fba4-c5bd-4ebc-9c59-74a821b430dc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/67 \\\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 no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/67"},{"claim":"Payment settles to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/messages/67"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) on a per-call basis without API keys","Fetching real-time finance data like exchange rates, token quotes, and gas estimates","Running data analytics queries and exporting reports with micropayments","Using utility services like geocoding, validation, and conversion without subscriptions"],"bestFor":["Agents or developers who want zero-signup, pay-per-use API access","Crypto-native applications that can pay in USDC on Base","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["High-volume production workloads needing SLAs and guaranteed uptime","Users without USDC on Base or unfamiliar with x402 payment protocol","Applications requiring detailed API documentation and typed schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.074Z"},"updatedAt":"2026-04-22T02:32:08.067Z"}}