{"id":"976419bf-03b0-4bf5-95b4-57d265cdabfe","shortId":"RQ6tYz","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/charges/233` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. The platform also advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the individual endpoints actually accept or return. The 402 challenge confirms the endpoint is live and uses x402 version 1 with the \"exact\" payment scheme, a 300-second timeout, and outputs application/json via HTTP POST.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","data-analytics","ai-sentiment-analysis","text-summarization","text-classification","embeddings","price-feeds","exchange-rates","gas-estimates","geocoding","validation","conversion"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","cheap api access"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no substantive content","No OpenAPI or schema available — request and response formats are unknown","The specific purpose of /api/v1/charges/233 ('Premium API Access') is not documented; it is unclear how it differs from other listed endpoints","No information on uptime, SLAs, or data sources behind any of the advertised endpoints"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/233","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/charges/233","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages return only 'Connect wallet' with no useful content. The purpose of this specific endpoint (/api/v1/charges/233) is unclear beyond the generic label 'Premium API 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'/request':13,28 '0.02':12,27,63,122,152 '000':111 '0x8335':116 '1':209 '20':110 '2913':117 '300':216 '402':105,198 'accept':194 'access':101 'across':45 'actual':193 'advertis':126 'ai-sentiment-analysis' 'ai/ml':48 'also':125 'analysi':130 'analyt':47 'api':5,20,37,73,100,161 'application/json':221 'attach':83 'base':8,23,70,112,119 'base network api' 'call':4,19 'caller':81 'challeng':106,199 'cheap api access' 'classif':133 'confirm':200 'connect':170 'content':176 'convers':145 'conversion' 'data':46,51 'data-analytics' 'descript':187 'doc':160 'document':155 'embed':134 'embeddings' 'enabl':36 'endpoint':44,56,93,127,192,202 'equal':121 'estim':142 'exact':212 'exampl':184 'exchang':137 'exchange-rates' 'extrem':157 'feed':136 'finance/web3':50 'gas':141 'gas-estimates' 'generat':147 'geocod':143 'geocoding' 'header':87 'http':223 'individu':191 'infer':49 'key':74 'limit':76 'list':97 'live':204 'low payment fee' 'lowpaymentfee.com':31 'micropayment api' 'network':9,24,71 'offer':40 'openapi':180 'output':220 'page':165 'pay':2,17,59 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':58 'payment':86,213 'per':3,18,60 'platform':6,21,38,124 'point':154 'post':224 'premium':99 'price':135,153,162 'price-feeds' 'prompt':172 'quot':140 'rate':75,138 'readm':164 'render':167 'request':61,90,107 'request/response':183 'requir':80 'return':103,196 'schema':181 'scheme':214 'second':217 'sentiment':129 'servic':54 'settl':65 'simpli':82 'spars':158 'specif':92 'subscript':78 'substant':175 'summar':132 'text':131 'text-classification' 'text-summarization' 'timeout':218 'token':139 'unit':113 'usdc':15,30,67,115 'usdc api' 'usdc-base-network' 'use':206 'util':53 'valid':144 'validation' 'varieti':42 'version':208 'via':10,25,222 'wallet':171 'x402':11,26,35,85,207 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"7578ed08-22d4-4bba-b399-75fa9f21b749","listingId":"976419bf-03b0-4bf5-95b4-57d265cdabfe","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/charges/233","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:34.530Z"}],"sources":[{"listingId":"976419bf-03b0-4bf5-95b4-57d265cdabfe","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/233","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:34.530Z","lastSeenAt":"2026-04-23T10:00:48.007Z"}],"details":{"listingId":"976419bf-03b0-4bf5-95b4-57d265cdabfe","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/233 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02/request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"402 challenge requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/233"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes, gas estimates, or exchange rates with per-call payment","Geocoding or data validation as a utility service with no subscription commitment","Exporting analytics data or generating insights on a pay-as-you-go basis"],"bestFor":["AI agents that need low-friction, keyless API access via x402","Developers wanting to prototype with multiple API categories at a flat $0.02/call","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.999Z"},"updatedAt":"2026-04-23T10:00:48.007Z"}}