{"id":"c102f933-885f-4a9b-9f3c-5e5f205877e4","shortId":"CQmxbS","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 exposes a broad catalog of 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 utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/messages/141` is listed as \"Premium API Access.\" Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the `exact` scheme with a 300-second timeout. No API keys or rate limits are advertised — callers simply attach an X-PAYMENT header to each POST request.\n\nDocumentation is minimal: the landing page lists available endpoints and pricing, but the /api, /pricing, and /README pages all resolve to a bare \"Connect wallet\" prompt with no further detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples. The purpose of the `/api/v1/messages/141` endpoint specifically is unclear — the generic \"Premium API Access\" label does not describe what data or functionality it returns. Callers should expect JSON responses (mimeType is application/json) but will need to experiment to discover the actual input and output formats.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific endpoint /api/v1/messages/141 has only a generic 'Premium API Access' label — its actual functionality is unknown","No request or response examples are documented anywhere","The /pricing, /api, and /README pages contain no useful content beyond 'Connect wallet'","Cannot verify what data or service is actually returned without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/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/messages/141","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no usage examples, and the specific purpose of /api/v1/messages/141 is undocumented. The /api, /pricing, and /README pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1/messages/141':112,223 '/pricing':190 '/readme':192 '/request':19,38 '0.02':18,37,94,138 '000':127 '0x8335':132 '20':126 '2913':133 '300':153 '402 payment api' '6':142 'access':118,232 'across':54 'actual':259 'advertis':122,163 'ai':12,31,63 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'analysi':67 'analyt':58 'api':5,24,45,117,157,231 'application/json':250 'attach':166 'avail':183 'bare':198 'base':8,27,102,128,135 'base network api' 'broad':50 'call':4,23 'caller':164,243 'catalog':51 'categori':56 'challeng':121 'classif':70 'connect':199 'convers':87 'conversion' 'crypto-gas-estimates' 'data':11,30,57,238 'data-analytics' 'decim':143 'describ':236 'detail':205 'discov':257 'document':176,214 'embed':71 'enabl':44 'endpoint':16,35,53,90,110,184,224 'equal':137 'estim':81 'exact':149 'exampl':218 'exchang':76 'exchange-rates' 'expect':245 'experi':255 'export':61 'expos':48 'feed':75 'financ':13,32,72 'finance-price-feeds' 'format':263 'four':55 'function':240 'gas':80 'generat':88 'generic':229 'geocod':85 'geocoding' 'given':139 'header':171 'infrastructur':83 'input':260 'insight':62 'json':246 'key':158 'label':233 'land':180 'learn':65 'limit':161 'list':114,182 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':64 'made':146 'maxamountrequir':124 'metric':59 'micropayment api' 'mimetyp':248 'minim':178 'need':253 'network':103 'offer':10,29 'openapi':209 'output':262 'page':181,193 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':144,170 'per':3,22,95 'platform':6,25,46 'post':174 'premium':116,230 'price':74,92,186 'prompt':201 'protocol':107 'purpos':220 'quot':79 'rate':77,160 'report':60 'request':96,175 'request/response':212 'resolv':195 'respons':247 'return':242 'schema':213 'scheme':150 'second':154 'sentiment':66 'settl':97 'simpli':165 'spec':210 'specif':109,225 'summar':69 'text':68 'timeout':155 'token':78 'unclear':227 'unit':129 'usag':217 'usdc':9,28,99,131,140 'usdc api' 'usdc-base' 'util':15,34,84 'valid':86 'validation' 'via':104,147 'wallet':200 'web3':73 'x':169 'x-payment':168 'x402':43,106,120 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"f9b9d287-da90-4d56-8971-beee1a96d02e","listingId":"c102f933-885f-4a9b-9f3c-5e5f205877e4","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/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":"2026-04-21T18:32:26.223Z"}],"sources":[{"listingId":"c102f933-885f-4a9b-9f3c-5e5f205877e4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/141","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.223Z","lastSeenAt":"2026-04-22T02:32:06.487Z"}],"details":{"listingId":"c102f933-885f-4a9b-9f3c-5e5f205877e4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/141 \\\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 are 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":"The x402 challenge for /api/v1/messages/141 specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/141"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time crypto price feeds and gas estimates on a per-call basis","Running geocoding or data validation as a lightweight utility service","Exporting analytics data or generating reports with per-request billing"],"bestFor":["Agents or bots that need instant, keyless API access via crypto micropayments","Developers prototyping against multiple endpoint categories without subscription commitments","Low-volume or sporadic callers who prefer pay-per-use over monthly plans"],"notFor":["High-volume production workloads that need documented SLAs, rate-limit guarantees, and detailed schemas","Users who cannot pay in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.348Z"},"updatedAt":"2026-04-22T02:32:06.487Z"}}