{"id":"a42b1669-d569-4bd9-a68d-14940f516d44","shortId":"D8ukJ4","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general infrastructure utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint `/api/v1/messages/21` is listed as \"Premium API Access\" and accepts HTTP 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 `exact` scheme with a 300-second timeout. The broader platform also exposes 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 minimal: the landing page lists available endpoints and pricing, but there is no OpenAPI spec, no request/response schema documentation, and the /api, /pricing, and /README pages all resolve to a bare \"Connect wallet\" prompt. Without detailed schemas or example payloads, integrators will need to experiment to discover the expected request format and response structure for each endpoint.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","http-post","data-analytics","ai-inference","sentiment-analysis","text-summarization","text-classification","embeddings","finance-data","crypto-data","geocoding","utility-apis"],"categories":["llm","search","geo","finance"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","cheap api","no-auth api"],"warnings":["No OpenAPI or schema documentation available — request/response formats are unknown","The /api, /pricing, and /README pages all return only a 'Connect wallet' prompt with no useful content","The specific function of /api/v1/messages/21 is undocumented; 'Premium API Access' is a generic label","Cannot verify that the broader endpoint catalog (AI, finance, utils) is actually functional — only this single endpoint was probed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/21","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/21","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, but there is no OpenAPI spec, no request/response schema, no example payloads, and the docs pages are empty beyond a wallet-connect prompt. The specific purpose of /api/v1/messages/21 is unclear beyond the generic label 'Premium API 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'/api/v1/messages/21':95 '/pricing':201 '/readme':203 '/request':18,36 '0.02':17,35,68,126,174 '000':116 '0x8335':121 '20':115 '300':141 '6':130 'accept':103 'access':101 'advertis':110 'ai':12,30 'ai-inference' 'ai/ml':55 'also':147 'analysi':152 'analyt':11,29,54 'api':5,23,43,83,100 'avail':184 'bare':209 'base':8,26,76,117,123 'base network api' 'broad':48 'broader':145 'call':4,22 'catalog':49 'challeng':109 'cheap api' 'classif':155 'commit':91 'connect':210 'convers':167 'cost':113 'cover':10,28 'crypto-data' 'data':53,58 'data-analytics' 'decim':131 'detail':214 'discov':225 'document':177,197 'embed':156 'embeddings' 'enabl':42 'endpoint':51,64,94,149,185,235 'equal':125 'estim':164 'everi':63 'exact':137 'exampl':217 'exchang':159 'expect':227 'experi':223 'expos':148 'feed':158 'financ':13,31 'finance-data' 'finance/web3':57 'format':229 'gas':163 'general':60 'generat':169 'geocod':165 'geocoding' 'given':127 'http':104 'http-post' 'infer':56 'infrastructur':61 'integr':219 'key':84 'land':181 'limit':87 'list':97,183 'low payment fee' 'lowpaymentfee.com':37 'made':134 'maximum':112 'micropayment api' 'minim':179 'need':221 'network':77 'no-auth api' 'offer':46 'openapi':192 'page':182,204 'paid':71 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payload':218 'payment':132 'per':3,21,69 'platform':44,146 'point':176 'post':105 'premium':99 'price':66,157,175,187 'prompt':212 'protocol':81 'quot':162 'rate':86,160 'request':70,106,228 'request/response':195 'resolv':206 'respons':231 'schema':196,215 'scheme':138 'second':142 'sentiment':151 'sentiment-analysis' 'span':52 'spec':193 'specif':93 'structur':232 'suit':6,24 'summar':154 'text':153 'text-classification' 'text-summarization' 'timeout':143 'token':161 'unit':118 'upfront':90 'usdc':9,27,73,120,128 'usdc api' 'usdc-base' 'util':15,33,62 'utility-apis' 'valid':166 'via':78,135 'wallet':211 'without':213 'x402':41,80,108 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"7613a332-58e5-4c38-992f-f81d283274de","listingId":"a42b1669-d569-4bd9-a68d-14940f516d44","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/21","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.644Z"}],"sources":[{"listingId":"a42b1669-d569-4bd9-a68d-14940f516d44","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/21","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.644Z","lastSeenAt":"2026-04-22T02:32:07.413Z"}],"details":{"listingId":"a42b1669-d569-4bd9-a68d-14940f516d44","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/21 \\\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 platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, instant access, on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge shows maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with exact scheme","source_url":"https://lowpaymentfee.com/api/v1/messages/21"}],"useCases":["Agent-driven data retrieval without managing API keys or subscriptions","On-demand AI inference (sentiment, summarization, classification, embeddings) paid per call","Fetching real-time crypto prices, gas estimates, and exchange rates via micropayments","Geocoding and data conversion utilities for automated pipelines"],"bestFor":["AI agents that need frictionless, key-less API access","Developers prototyping with low-cost, pay-as-you-go endpoints","Web3-native applications already operating on Base with USDC"],"notFor":["High-volume production workloads needing SLAs and guaranteed uptime","Users who need detailed API documentation and typed schemas before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.767Z"},"updatedAt":"2026-04-22T02:32:07.413Z"}}