{"id":"fe49ea45-a0f0-44fa-b953-3ce2a3829341","shortId":"uwKqFy","kind":"x402","title":"x402-gated API suite on Base: AI, analytics, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API suite on Base: AI, analytics, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that exposes a broad collection of endpoints across four categories: Data & Analytics (metrics, reports, data 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 pay-per-call with no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint at `/api/v1/messages/148` is listed as \"Premium API Access\" and returns a valid x402 challenge on POST. It accepts payment in USDC on the Base network, with a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). Payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the \"exact\" scheme.\n\nDocumentation beyond the landing page is sparse — the /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no additional content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The purpose of the `/messages/148` endpoint specifically is unclear; it may be a messaging or content-retrieval endpoint, but this is not documented. The platform advertises uniform $0.02 pricing across all listed endpoints.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","crypto-gas-estimates"],"categories":["llm","search","geo","finance"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api","premium api access","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific purpose of /api/v1/messages/148 ('Premium API Access') is not documented — unclear what it returns","All secondary pages (/api, /pricing, /README) resolve to an empty wallet-connect prompt with no useful content","No request or response examples are available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/148","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/148","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 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no examples, and the specific purpose of /api/v1/messages/148 is undocumented. The /api, /pricing, and /README pages are empty beyond a wallet-connect 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'/api/v1/messages/148':106 '/messages/148':202 '/pricing':168 '/readme':170 '/request':16,32 '0.02':15,31,140,226 '000':136 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':154 '20':135 '6':144 'accept':122 'access':112 'across':48,228 'addit':182 'address':153 'advertis':224 'ai':8,24,58 'ai-inference' 'amount':133 'analysi':62 'analyt':9,25,52 'api':4,20,39,93,111 'avail':197 'base':7,23,128,137 'base network api' 'beyond':160 'broad':44 'call':90 'categori':50 'chain':151 'challeng':118 'classif':65 'classification' 'collect':45 'commit':101 'connect':178 'content':183,214 'content-retriev':213 'convers':82 'crypto-gas-estimates' 'data':51,55 'data-analytics' 'decim':145 'document':159,192,221 'embed':66 'embeddings' 'enabl':38 'endpoint':13,29,47,85,104,203,216,231 'estim':76 'exact':157 'exampl':195 'exchang':71 'export':56 'expos':42 'feed':70 'financ':10,26,67 'finance-data' 'four':49 'gas':75 'gate':3,19 'generat':83 'geocod':80 'geocoding' 'given':141 'i.e':139 'infrastructur':78 'insight':57 'key':94 'land':162 'learn':60 'limit':97 'list':108,230 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':59 'maximum':132 'may':208 'messag':211 'metric':53 'micropayment api' 'network':129 'no-api-key' 'on-chain':149 'openapi':187 'page':163,171 'pay':88 'pay per call api' 'pay-per-cal':87 'pay-per-request' 'payload':196 'payment':123,146 'per':89 'platform':40,223 'post':120 'premium':110 'premium api access' 'price':69,227 'prompt':179 'purpos':199 'quot':74 'rate':72,96 'report':54 'request/response':190 'resolv':173 'retriev':215 'return':114 'schema':191 'scheme':158 'sentiment':61 'sentiment-analysis' 'settl':148 'spars':165 'spec':188 'specif':103,204 'suit':5,21 'summar':64 'text':63 'text-summarization' 'token':73 'unclear':206 'uniform':225 'unit':138 'upfront':100 'usdc':125,142 'usdc api' 'usdc-base' 'use':155 'util':12,28,79 'valid':81,116 'wallet':177 'wallet-connect':176 'web3':68 'x402':2,18,37,117 'x402 api' 'x402-enabled':36 'x402-gated':1,17 'x402-payment'","prices":[{"id":"19089c19-ee78-4d9c-b01f-cfb30da843dd","listingId":"fe49ea45-a0f0-44fa-b953-3ce2a3829341","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/148","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.401Z"}],"sources":[{"listingId":"fe49ea45-a0f0-44fa-b953-3ce2a3829341","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/148","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.401Z","lastSeenAt":"2026-04-22T05:32:16.341Z"}],"details":{"listingId":"fe49ea45-a0f0-44fa-b953-3ce2a3829341","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/148 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/148"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/148"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time finance data (prices, exchange rates, gas estimates) via micropayments","Running utility operations like geocoding or data validation on a per-call basis","Integrating pay-per-use analytics and data export into agent workflows"],"bestFor":["AI agents that need frictionless, keyless API access via on-chain micropayments","Developers prototyping with low-cost, no-commitment API calls","Web3-native applications that prefer USDC settlement on Base"],"notFor":["High-volume production workloads needing SLAs, rate guarantees, or detailed documentation","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.092Z"},"updatedAt":"2026-04-22T05:32:16.341Z"}}