{"id":"ec68b5d5-b9f4-4b47-8f89-a9558caa52c2","shortId":"2tt4Qn","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","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 utility services. All endpoints are pay-per-request at $0.02 each, 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/transactions/263` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 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 POST requests and returns application/json.\n\nThe broader platform advertises endpoints in 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 (geocoding, validation, conversion, generation). Documentation pages exist but appear to require a wallet connection to view, so detailed request/response schemas for individual endpoints are not available from the crawl.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-auth api"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only a 'Connect wallet' prompt — no actual documentation is publicly accessible.","No OpenAPI or schema definitions are available; request and response formats for all endpoints are unknown.","The specific function of /api/v1/transactions/263 ('Premium API Access') is unclear — it may be a generic or placeholder endpoint.","The platform lists many endpoint categories (AI, finance, analytics, infrastructure) but none have verifiable documentation confirming they actually function as described."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/263","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/263","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint works and pricing is clear ($0.02 USDC on Base). However, documentation pages all resolve to a wallet-connect prompt with no actual content, there is no OpenAPI spec, and no request/response schemas or examples are available for any endpoint. The specific purpose of /api/v1/transactions/263 ('Premium API Access') is vague and 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'/request':13,28 '0.02':12,27,64,123 '000':112 '0x8335':117 '20':111 '2913':118 '300':136 '402':106 '6':127 'accept':141 'access':102 'account':76 'advertis':150 'ai':162 'ai-inference' 'ai/ml':49 'analysi':166 'analyt':48,156 'api':5,20,37,74,101 'appear':191 'application/json':146 'attach':84 'avail':208 'base':8,23,71,113,120 'base network api' 'broad':42 'broader':148 'call':4,19 'caller':82 'catalog':43 'categori':154 'challeng':107 'classif':169 'classification' 'connect':196 'convers':185 'conversion' 'crawl':211 'crypto-quotes' 'data':47,52,155,159 'data-analytics' 'decim':128 'detail':200 'document':187 'embed':170 'embeddings' 'enabl':36 'endpoint':45,57,94,140,151,205 'equal':122 'estim':180 'exact':133 'exchang':175 'exist':189 'export':160 'feed':174 'financ':171 'finance-data' 'finance/web3':51 'four':153 'gas':179 'gas-estimates' 'generat':186 'geocod':183 'geocoding' 'given':124 'header':88 'individu':204 'infer':50 'infrastructur':182 'insight':161 'key':75 'learn':164 'limit':79 'list':98 'low payment fee' 'lowpaymentfee.com':31 'machin':163 'metric':157 'micropayment api' 'network':9,24,72 'no-auth api' 'offer':40 'page':188 'pay':2,17,60 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':59 'payment':87,130 'per':3,18,61 'platform':6,21,38,149 'post':142 'premium':100 'price':173 'quot':178 'rate':78,176 'report':158 'request':62,91,108,143 'request/response':201 'requir':81,193 'return':104,145 'schema':202 'scheme':131 'second':137 'sentiment':165 'sentiment-analysis' 'servic':55 'settl':66 'simpli':83 'span':46 'specif':93 'summar':168 'text':167 'text-summarization' 'timeout':138 'token':177 'unit':114 'usdc':15,30,68,116,125 'usdc api' 'usdc-base' 'util':54 'valid':184 'validation' 'via':10,25 'view':198 'wallet':195 'web3':172 'x402':11,26,35,86 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"2f270d4d-f954-485e-bef5-8112b8b520fb","listingId":"ec68b5d5-b9f4-4b47-8f89-a9558caa52c2","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/263","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:42.460Z"}],"sources":[{"listingId":"ec68b5d5-b9f4-4b47-8f89-a9558caa52c2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/263","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:42.460Z","lastSeenAt":"2026-04-22T11:32:22.162Z"}],"details":{"listingId":"ec68b5d5-b9f4-4b47-8f89-a9558caa52c2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/263 \\\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":"All endpoints 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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/263"},{"claim":"Platform offers endpoints in Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages resolve to wallet-connect prompt only","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes, gas estimates, or exchange rates with per-call payment","Running geocoding, data validation, or format conversion as utility microservices","Exporting analytics data or generating insights reports on a pay-as-you-go basis"],"bestFor":["AI agents that need diverse utility endpoints behind a single payment protocol","Developers who want zero-signup, zero-rate-limit API access","Applications settling micropayments in USDC on Base L2"],"notFor":["High-volume batch workloads where $0.02/request adds up significantly","Users who need detailed SLAs, uptime guarantees, or enterprise support","Callers who cannot settle payments in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.482Z"},"updatedAt":"2026-04-22T11:32:22.162Z"}}