{"id":"93081a92-b8d9-4222-9a7e-3a1d5a16d1be","shortId":"uzGcmt","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. 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/25` is listed as \"Premium API Access.\" Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts HTTP POST and returns `application/json`.\n\nThe broader platform advertises endpoints in 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 (geocoding, validation, conversion, generation). All share the same $0.02 pricing. Documentation beyond the landing page is sparse — the /api, /pricing, and /README pages all resolve to a minimal \"Connect wallet\" prompt with no further technical detail.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","data-analytics","finance-data","crypto-gas-estimates","geocoding","data-export","no-api-key"],"categories":["llm","data","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","ai inference api","analytics api"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","The specific endpoint /api/v1/messages/25 has no description beyond 'Premium API Access'; its actual functionality is unclear","All documentation pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no usable content","The platform lists many endpoint categories but none could be verified for actual functionality beyond the 402 challenge"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/25","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/25","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 confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema documentation, no examples, and the /api, /pricing, and /README pages are empty beyond a wallet-connect prompt. The purpose of the specific '/messages/25' endpoint is unclear beyond the generic 'Premium API Access' 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'/api/v1/messages/25':101 '/pricing':206 '/readme':208 '/request':18,36 '0.02':17,35,68,128,195 '000':117 '0x8335':122 '20':116 '2913':123 '300':141 '6':132 'accept':146 'access':107 'account':81 'advertis':111,155 'ai':11,29,166 'ai inference api' 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':55 'analysi':170 'analyt':12,30,54,161 'analytics api' 'api':5,23,43,79,106 'application/json':151 'attach':89 'base':8,26,76,118,125 'base network api' 'beyond':198 'broad':48 'broader':153 'call':4,22 'caller':87 'categori':159 'challeng':110 'classif':173 'collect':49 'connect':215 'convers':189 'cost':114 'cover':10,28 'crypto-gas-estimates' 'data':53,58,160 'data-analytics' 'data-export' 'decim':133 'detail':222 'document':197 'embed':174 'enabl':42 'endpoint':51,64,99,145,156 'equal':127 'estim':184 'everi':63 'exact':138 'exchang':179 'export':164 'feed':178 'financ':13,31,175 'finance-data' 'finance/web3':57 'four':158 'gas':183 'general':60 'generat':190 'geocod':187 'geocoding' 'given':129 'header':93 'http':147 'infer':56 'infrastructur':61,186 'insight':165 'key':80 'land':200 'learn':168 'limit':84 'list':103 'low payment fee' 'lowpaymentfee.com':37 'machin':167 'maximum':113 'metric':162 'micropayment api' 'minim':214 'network':77 'no-api-key' 'offer':46 'page':201,209 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payment':92,135 'per':3,21,69 'platform':44,154 'post':148 'premium':105 'price':66,177,196 'prompt':217 'quot':182 'rate':83,180 'report':163 'request':70,96 'requir':86 'resolv':211 'return':150 'scheme':136 'second':142 'sentiment':169 'settl':71 'share':192 'simpli':88 'span':52 'spars':203 'specif':98 'suit':6,24 'summar':172 'technic':221 'text':171 'timeout':143 'token':181 'unit':119 'usdc':9,27,73,121,130 'usdc api' 'usdc-base' 'util':15,33,62 'valid':188 'wallet':216 'web3':176 'x402':41,91,109 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"bcae0f37-dacb-4678-9cf5-ae16d291a8d6","listingId":"93081a92-b8d9-4222-9a7e-3a1d5a16d1be","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/25","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.672Z"}],"sources":[{"listingId":"93081a92-b8d9-4222-9a7e-3a1d5a16d1be","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/25","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.672Z","lastSeenAt":"2026-04-22T02:32:07.480Z"}],"details":{"listingId":"93081a92-b8d9-4222-9a7e-3a1d5a16d1be","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/25 \\\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 endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base (scheme: exact, timeout: 300s)","source_url":"https://lowpaymentfee.com/api/v1/messages/25"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/25"}],"useCases":["Running one-off AI inference tasks (sentiment, summarization, classification) without signing up for an account","Fetching real-time crypto token quotes or gas estimates via a single paid HTTP call","Geocoding addresses or validating data on demand with per-request USDC micropayments","Exporting analytics data or generating insights without subscription commitments"],"bestFor":["Agents or bots that need instant, keyless API access paid per call","Developers prototyping with multiple API categories (AI, finance, geo) under one provider","Web3-native workflows that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-request pricing at $0.02 adds up quickly","Users who need detailed API documentation, SDKs, or OpenAPI specs before integrating","Callers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.647Z"},"updatedAt":"2026-04-22T02:32:07.480Z"}}