{"id":"c07b9453-7853-48eb-b2f5-6a08e999b5ee","shortId":"cbPCCJ","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities 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 infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network, with no API keys, rate limits, or upfront commitments required.\n\nThe specific endpoint at `/api/v1/messages/53` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with a 300-second timeout window.\n\nThe broader platform advertises endpoints in 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 (geocoding, validation, conversion, generation). All share the same $0.02 pricing. Documentation beyond the landing page is sparse — the /api, /pricing, and /README pages all resolve to a minimal \"Connect wallet\" prompt with no further technical detail.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","data-analytics","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["llm","data","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","cheap api","lowpaymentfee"],"warnings":["No API documentation available — /api, /pricing, and /README pages all return only a 'Connect wallet' prompt with no technical content.","The specific purpose and expected input/output of /api/v1/messages/53 ('Premium API Access') is undocumented; the endpoint name gives no indication of functionality.","No OpenAPI spec, no request/response schema, and no usage examples are provided anywhere on the site.","The broad category labels (AI, analytics, finance, infrastructure) are listed on the landing page but none have been independently verified for actual functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/53","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/53","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). However, there is no OpenAPI schema, no request/response examples, no documentation beyond a landing page listing, and the specific purpose of /api/v1/messages/53 is entirely unclear. The /api, /pricing, and /README pages are all empty wallet-connect 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'/api/v1/messages/53':92 '/pricing':197 '/readme':199 '/request':18,36 '0.02':17,35,68,122,186 '000':112 '0x8335':117 '20':111 '300':138 '6':126 'accept':100 'access':98 'advertis':106,145 'ai':11,29,157 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':55 'analysi':161 'analyt':12,30,54,151 'api':5,23,43,80,97 'base':8,26,76,113,119 'base network api' 'beyond':189 'broad':48 'broader':143 'call':4,22 'categori':149 'challeng':105 'cheap api' 'classif':164 'collect':49 'commit':86 'connect':206 'convers':180 'conversion' 'cost':109 'cover':10,28 'crypto-quotes' 'data':53,58,150,154 'data-analytics' 'decim':127 'detail':213 'document':188 'embed':165 'enabl':42 'endpoint':51,64,90,146 'equal':121 'estim':175 'everi':63 'exact':134 'exchang':170 'export':155 'feed':169 'financ':13,31,166 'finance-data' 'finance/web3':57 'four':148 'gas':174 'gas-estimates' 'general':60 'generat':181 'geocod':178 'geocoding' 'given':123 'infer':56 'infrastructur':61,177 'insight':156 'key':81 'land':191 'learn':159 'limit':83 'list':94 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':158 'made':130 'maximum':108 'metric':152 'micropayment api' 'minim':205 'network':77 'offer':46 'page':192,200 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payment':128 'per':3,21,69 'platform':44,144 'post':101 'premium':96 'price':66,168,187 'prompt':208 'quot':173 'rate':82,171 'report':153 'request':70,102 'requir':87 'resolv':202 'scheme':135 'second':139 'sentiment':160 'settl':71 'share':183 'span':52 'spars':194 'specif':89 'suit':6,24 'summar':163 'technic':212 'text':162 'timeout':140 'token':172 'unit':114 'upfront':85 'usdc':9,27,73,116,124 'usdc api' 'usdc-base' 'util':15,33,62 'valid':179 'validation' 'via':131 'wallet':207 'web3':167 'window':141 'x402':41,104,133 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"9e99340f-4942-4bb9-a931-876500d4faa0","listingId":"c07b9453-7853-48eb-b2f5-6a08e999b5ee","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/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.021Z"}],"sources":[{"listingId":"c07b9453-7853-48eb-b2f5-6a08e999b5ee","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/53","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.021Z","lastSeenAt":"2026-04-22T02:32:08.086Z"}],"details":{"listingId":"c07b9453-7853-48eb-b2f5-6a08e999b5ee","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/53 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/messages/53","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints are priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/messages/53 specifies maxAmountRequired of 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/messages/53"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"/api, /pricing, and /README pages resolve to minimal 'Connect wallet' content with no documentation","source_url":"https://lowpaymentfee.com/api"}],"useCases":["Running sentiment analysis or text summarization without managing API keys or subscriptions","Fetching real-time crypto token quotes and gas estimates on demand","Geocoding addresses or validating data via a simple pay-per-call model","Exporting analytics data or generating insights with per-request billing","Generating embeddings for search or classification tasks"],"bestFor":["Agents or bots that need low-friction, keyless API access paid in USDC","Developers prototyping with multiple API categories at a flat $0.02/call","Web3-native applications that prefer on-chain settlement over traditional billing"],"notFor":["High-volume production workloads where per-request pricing at $0.02 adds up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Applications requiring fiat-only payment rails with no crypto involvement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.074Z"},"updatedAt":"2026-04-22T02:32:08.086Z"}}