{"id":"f5496107-7186-44bf-9167-c19cb71ca7fa","shortId":"Wdptna","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/83` is listed as \"Premium API Access.\" Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 (USDC uses 6 decimals). The endpoint accepts HTTP POST requests and returns `application/json`. Payment is made via the x402 exact scheme to the provider's wallet address.\n\nThe platform also advertises additional endpoint categories: sentiment analysis, text summarization, classification, embeddings, metrics, reports, data export, insights, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, no OpenAPI schema, request/response examples, or detailed documentation were found during crawling; the /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","ai-inference","data-analytics","finance-data","web3-data","utility-services"],"categories":["llm","data","finance","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","USDC pay-per-call","micropayment API","Base network API","cheap API calls"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific endpoint /api/v1/messages/83 has no description beyond 'Premium API Access' — its actual functionality is unknown","Documentation pages (/api, /pricing, /README) returned no useful content","No request or response examples could be found or inferred","The broad catalog of endpoints (AI, analytics, finance, utils) is advertised on the landing page but none were individually probed or verified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/83","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/83","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI schema, no request/response examples, and no meaningful documentation — the /api, /pricing, and /README pages are all blank beyond a wallet-connect prompt. The purpose of the specific /messages/83 endpoint is unclear beyond the generic label 'Premium API Access.' This is effectively a stub 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'/api/v1/messages/83':92 '/pricing':199 '/readme':201 '/request':18,36 '0.02':17,35,68,118,181 '000':108 '0x8335':113 '20':107 '6':121 'Base network API' 'USDC pay-per-call' 'accept':125 'access':98 'addit':150 'address':145 'advertis':102,149 'ai':11,29 'ai-inference' 'ai/ml':55 'also':148 'analysi':154 'analyt':12,30,54 'api':5,23,43,80,97 'application/json':131 'base':8,26,76,109,115 'broad':48 'call':4,22 'categori':152 'challeng':101 'cheap API calls' 'classif':157 'collect':49 'commit':86 'connect':207 'content':213 'convers':174 'cost':105 'cover':10,28 'crawl':196 'data':53,58,161 'data-analytics' 'decim':122 'detail':191 'document':192 'embed':158 'enabl':42 'endpoint':51,64,90,124,151 'equal':117 'estim':171 'everi':63 'exact':138 'exampl':189 'exchang':166 'export':162 'feed':165 'financ':13,31 'finance-data' 'finance/web3':57 'found':194 'gas':170 'general':60 'generat':176 'geocod':172 'howev':184 'http':126 'infer':56 'infrastructur':61 'insight':163 'json-api' 'key':81 'limit':83 'list':94 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':37 'made':134 'maximum':104 'metric':159 'micropayment API' 'network':77 'offer':46 'openapi':186 'page':202 'pay':2,20 'pay-per-cal':1,19 'pay-per-request' 'payment':132 'per':3,21,69 'platform':44,147 'point':183 'post':127 'premium':96 'price':66,164,182 'prompt':209 'provid':142 'quot':169 'rate':82,167 'report':160 'request':70,128 'request/response':188 'requir':87 'return':130,204 'schema':187 'scheme':139 'sentiment':153 'settl':71 'span':52 'specif':89 'substant':212 'suit':6,24 'summar':156 'text':155 'token':168 'unit':110 'upfront':85 'usdc':9,27,73,112,119 'usdc-base' 'use':120 'util':15,33,62 'utility-services' 'valid':173 'via':135 'wallet':144,208 'web3-data' 'x402':41,100,137 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"d7e332b1-a02d-46dd-ad5b-167bf92c38bb","listingId":"f5496107-7186-44bf-9167-c19cb71ca7fa","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/83","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.188Z"}],"sources":[{"listingId":"f5496107-7186-44bf-9167-c19cb71ca7fa","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/83","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.188Z","lastSeenAt":"2026-04-22T02:32:08.254Z"}],"details":{"listingId":"f5496107-7186-44bf-9167-c19cb71ca7fa","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/83 \\\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":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/83"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/83"},{"claim":"All endpoints priced at $0.02 per request with no API keys, rate limits, or 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"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates via micropayments","Running analytics queries or exporting data with per-request billing settled on-chain"],"bestFor":["AI agents needing keyless, pay-per-call access to multiple utility endpoints","Developers prototyping with low-cost, no-commitment API access on Base","Web3-native applications that prefer on-chain USDC settlement over traditional billing"],"notFor":["High-volume production workloads where $0.02/request adds up (no bulk discounts documented)","Users who need detailed API documentation, request schemas, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.83Z"},"updatedAt":"2026-04-22T02:32:08.254Z"}}