{"id":"04246f54-7a00-4aed-b7bb-c29ec0afec6f","shortId":"LfBe8b","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utility endpoints 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 utility services. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/89` 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 payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 per-call price point. However, no OpenAPI schema, detailed documentation, or example request/response payloads were found in the crawl. The `/api`, `/pricing`, and `/README` pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","per-call-pricing","usdc-base","post-json","no-api-key","data-analytics","ai-inference","finance-data","web3-data","utility-services","geocoding","text-summarization","sentiment-analysis","embeddings"],"categories":["llm","data","finance","utility"],"synonyms":["low payment fee","pay per call API","x402 API","USDC API","Base network API","micropayment API","cheap API","per-request billing"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific function of /api/v1/messages/89 is unknown — 'Premium API Access' is a generic label","All documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no content","No example request or response payloads are documented anywhere in the crawl","The breadth of advertised endpoints (AI, finance, data, utils) could not be independently verified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/89","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/89","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 captured) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no documentation, no example responses, and the specific purpose of /api/v1/messages/89 is unclear beyond the generic label 'Premium API Access.' The /pricing, /README, and /api pages returned no useful 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'/api/v1/messages/89':103 '/pricing':208 '/readme':210 '/request':19,38 '0.02':18,37,70,129,185 '000':119 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':140 '0x8335':124 '20':118 '300':143 '6':132 'Base network API' 'USDC API' 'accept':148 'access':109 'account':83 'addit':158 'address':139 'advertis':113,157 'ai':12,31 'ai-inference' 'ai/ml':57 'analysi':162 'analyt':56 'api':5,24,45,81,108 'application/json':153 'attach':91 'base':8,27,78,120,126 'broad':50 'broader':155 'call':4,23,188 'caller':89 'challeng':112 'cheap API' 'classif':165 'collect':51 'connect':216 'content':222 'convers':177 'cost':116 'cover':10,29 'crawl':205 'data':11,30,55,60,179 'data-analytics' 'decim':133 'detail':195 'document':196 'embed':166 'embeddings' 'enabl':44 'endpoint':16,35,53,66,101,147,159 'equal':128 'estim':174 'everi':65 'exampl':198 'exchang':169 'feed':168 'financ':13,32 'finance-data' 'finance/web3':59 'found':202 'gas':173 'general':62 'generat':180 'geocod':175 'geocoding' 'header':95 'howev':191 'includ':160 'infer':58 'key':82 'limit':86 'list':105 'low payment fee' 'lowpaymentfee.com':39 'maximum':115 'micropayment API' 'network':79 'no-api-key' 'offer':48 'openapi':193 'page':211 'pay':2,21 'pay per call API' 'pay-per-cal':1,20 'payload':200 'payment':94,135 'per':3,22,71,187 'per-cal':186 'per-call-pricing' 'per-request billing' 'platform':46,156 'point':190 'post':149 'post-json' 'premium':107 'price':68,167,189 'prompt':218 'quot':172 'rate':85,170 'request':72,98,150 'request/response':199 'requir':88 'return':152,213 'schema':194 'second':144 'sent':137 'sentiment':161 'sentiment-analysis' 'servic':64 'settl':73 'simpli':90 'span':54 'specif':100 'substant':221 'suit':6,25 'summar':164 'text':163 'text-summarization' 'timeout':145 'token':171 'unit':121 'usdc':9,28,75,123,130 'usdc-base' 'use':131 'util':15,34,63 'utility-services' 'valid':176 'wallet':217 'web3-data' 'x402':43,93,111 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"383dc8ba-18f2-4208-8da8-44b138127fa3","listingId":"04246f54-7a00-4aed-b7bb-c29ec0afec6f","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/89","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.622Z"}],"sources":[{"listingId":"04246f54-7a00-4aed-b7bb-c29ec0afec6f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/89","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.622Z","lastSeenAt":"2026-04-22T04:02:41.446Z"}],"details":{"listingId":"04246f54-7a00-4aed-b7bb-c29ec0afec6f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/89 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -d '{\"message\": \"hello\"}'","exampleRequest":{"message":"hello"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/89"},{"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 platform advertises endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/89"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time crypto prices, gas estimates, and exchange rates on a per-call basis","Running geocoding, validation, or data conversion tasks with instant pay-per-use billing","Exporting data or generating analytics reports with no subscription commitment"],"bestFor":["Agents and bots that need frictionless, keyless API access via x402","Developers prototyping with multiple API categories without managing subscriptions","Low-volume or bursty workloads where per-call pricing is more economical than monthly plans"],"notFor":["High-volume production workloads where bulk/subscription pricing would be cheaper","Users who need detailed API documentation, SDKs, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.122Z"},"updatedAt":"2026-04-22T04:02:41.446Z"}}