{"id":"989926c5-b81c-4709-9a1f-ee95732d9b67","shortId":"ZV4shr","kind":"x402","title":"x402-gated API platform on Base offering analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are pay-per-request using USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint being listed here (`/api/v1/transactions/20/receipt`) is described as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) on Base. The broader platform advertises a uniform $0.02 per request across all its endpoints. Categories of available APIs include: metrics and reports (Data & Analytics), sentiment analysis, text summarization, classification, and embeddings (AI & ML), price feeds, exchange rates, token quotes, and gas estimates (Finance & Web3), and geocoding, validation, conversion, and generation (Infrastructure/Utilities).\n\nDocumentation pages (/docs, /pricing, /api, /README) all returned minimal content (just a \"Connect wallet\" prompt), so detailed request/response schemas, parameter descriptions, and example payloads are not available from the crawl. The endpoint is confirmed live via a valid x402 402 challenge. Payment is settled in USDC on Base to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","sentiment-analysis","text-summarization","text-classification","embeddings","price-feeds","exchange-rates","gas-estimates","geocoding","validation","conversion"],"categories":["llm","finance","geo","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","ai inference api","crypto data api"],"warnings":["All documentation pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' with no substantive content","No OpenAPI or JSON schema available for request or response payloads","The specific endpoint path '/api/v1/transactions/20/receipt' is unclear in purpose—'Premium API Access' is generic","Cannot verify what actual data or functionality any of the advertised endpoints provide"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/20/receipt","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/transactions/20/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge and pricing is clear ($0.02 USDC on Base). However, all documentation pages returned only 'Connect wallet' with no usable content—no OpenAPI spec, no request/response schemas, no examples. The endpoint path ('transactions/20/receipt') and description ('Premium API Access') are vague and don't clarify what data is 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'/api/v1/transactions/20/receipt':91 '/docs':168 '/pricing':169 '/readme':171 '/request':17,34 '0.02':16,33,113,122 '000':107 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':216 '20':106 '402':101,205 'access':97 'across':125 'address':215 'advertis':119 'ai':10,27,146 'ai inference api' 'ai/ml':52 'analysi':140 'analyt':9,26,51,138 'api':4,21,41,75,96,132 'avail':131,192 'base':7,24,71,108,115,213 'base network api' 'broader':117 'categori':129 'challeng':102,206 'classif':143 'collect':46 'commit':83 'confirm':199 'connect':178 'content':175 'convers':162 'conversion' 'crawl':195 'crypto data api' 'data':50,55,137 'data-analytics' 'describ':93 'descript':186 'detail':182 'document':166 'embed':145 'embeddings' 'enabl':40 'endpoint':14,31,48,61,87,128,197 'estim':156 'exampl':188 'exchang':150 'exchange-rates' 'feed':149 'financ':11,28,157 'finance/web3':54 'gas':155 'gas-estimates' 'gate':3,20 'general':57 'generat':164 'geocod':160 'geocoding' 'i.e':112 'includ':133 'infer':53 'infrastructure/utilities':165 'key':76 'limit':79 'list':89 'live':200 'low payment fee' 'lowpaymentfee.com':35 'metric':134 'micropayment api' 'minim':174 'minimum':82 'ml':147 'network':72 'offer':8,25 'page':167 'paramet':185 'pay':64 'pay per call api' 'pay-per-request':63 'payload':189 'payment':207 'per':65,123 'platform':5,22,42,118 'premium':95 'price':148 'price-feeds' 'prompt':180 'provid':44 'quot':153 'rate':78,151 'report':136 'request':66,103,124 'request/response':183 'requir':84 'return':99,173 'schema':184 'sentiment':139 'sentiment-analysis' 'servic':59 'settl':209 'span':49 'specif':86 'summar':142 'text':141 'text-classification' 'text-summarization' 'token':152 'uniform':121 'unit':109 'usdc':68,111,211 'usdc api' 'usdc-base' 'use':67 'util':13,30,58 'valid':161,203 'validation' 'via':201 'wallet':179 'web3':158 'x402':2,19,39,204 'x402 api' 'x402-enabled':38 'x402-gated':1,18 'x402-payment'","prices":[{"id":"cd673565-67ac-438a-8867-0f9ca1d94787","listingId":"989926c5-b81c-4709-9a1f-ee95732d9b67","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/transactions/20/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:04.806Z"}],"sources":[{"listingId":"989926c5-b81c-4709-9a1f-ee95732d9b67","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/20/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:04.806Z","lastSeenAt":"2026-04-22T21:31:37.411Z"}],"details":{"listingId":"989926c5-b81c-4709-9a1f-ee95732d9b67","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/20/receipt \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/20/receipt"},{"claim":"The platform advertises $0.02/request uniform pricing with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/20/receipt"}],"useCases":["Querying real-time financial data (prices, exchange rates, gas estimates) with per-call USDC payments","Running AI inference tasks (sentiment analysis, summarization, classification, embeddings) without API key management","Accessing utility services like geocoding, validation, and data conversion on a pay-as-you-go basis","Retrieving transaction receipts or analytics reports with no subscription commitment"],"bestFor":["Agents or developers who want keyless, pay-per-request API access on Base","Projects needing low-cost micropayment-gated AI and data endpoints","Web3-native applications that prefer on-chain settlement over traditional billing"],"notFor":["High-volume production workloads that need guaranteed SLAs and detailed documentation","Users who need comprehensive OpenAPI schemas and example payloads before integration","Teams that cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.283Z"},"updatedAt":"2026-04-22T21:31:37.411Z"}}