{"id":"76d5c537-c8db-49fd-87a2-922f0844c4e8","shortId":"vKmt9C","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/89` 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 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-data","geocoding","utility-services"],"categories":["ai","finance","data","infrastructure"],"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 'Connect wallet' with no usable content","The specific endpoint /api/v1/transactions/89 is not listed in the site's catalog — its purpose is unclear","No request or response schemas are available; input format and output structure are unknown","No OpenAPI spec or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/89","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/89","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge. However, documentation pages all resolve to a 'Connect wallet' stub, so there are no request/response schemas, no detailed endpoint descriptions, and no examples available. The specific endpoint '/api/v1/transactions/89' has a generic 'Premium API Access' label with no indication of what it actually does beyond the broader platform 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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':207 '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':195 'convers':185 'crawl':210 'crypto-data' 'data':47,52,155,159 'data-analytics' 'decim':128 'detail':199 'document':187 'embed':170 'embeddings' 'enabl':36 'endpoint':45,57,94,140,151,204 '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 'generat':186 'geocod':183 'geocoding' 'given':124 'header':88 'individu':203 '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':200 'requir':81,193 'return':104,145 'schema':201 '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 'utility-services' 'valid':184 'via':10,25 'view':197 'wallet':194 'web3':172 'x402':11,26,35,86 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"1eed461b-8a0b-43aa-8de7-9ca1f693667e","listingId":"76d5c537-c8db-49fd-87a2-922f0844c4e8","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/89","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:08.228Z"}],"sources":[{"listingId":"76d5c537-c8db-49fd-87a2-922f0844c4e8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/89","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:08.228Z","lastSeenAt":"2026-04-22T10:02:29.644Z"}],"details":{"listingId":"76d5c537-c8db-49fd-87a2-922f0844c4e8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/89 \\\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 requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/89"},{"claim":"Platform offers endpoints in Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto prices, gas estimates, or exchange rates with per-call payment","Running geocoding or data validation as a utility service from an autonomous agent","Exporting analytics data or generating insights 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, pay-per-use API access on Base","Applications requiring low-cost micropayment-settled API calls ($0.02 each)"],"notFor":["High-volume batch workloads where per-call pricing would be expensive at scale","Users who need detailed SLAs, guaranteed uptime, or enterprise support contracts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.969Z"},"updatedAt":"2026-04-22T10:02:29.644Z"}}