{"id":"afa737fe-2fe3-4cc8-816d-03974719887d","shortId":"emLr2Q","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","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 utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network using the x402 payment protocol. There are no API keys, no rate limits, and no subscriptions — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/360` is listed as \"Premium API Access\" and returns `application/json`. Its x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and has a payment timeout of 300 seconds.\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). All are priced identically at $0.02 per call. Documentation pages exist but appear to require a wallet connection to view, so detailed request/response schemas are not available from the crawl.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","no-api-key"],"categories":["ai","data","finance","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","low fee API","crypto-paid API","on-demand API"],"warnings":["The specific purpose of /api/v1/transactions/360 ('Premium API Access') is unclear — no schema or documentation describes its input/output.","All documentation, pricing, API, and README pages require wallet connection and return no useful content to crawlers.","No OpenAPI spec or detailed endpoint documentation was found.","The platform lists many endpoint categories but none could be verified for actual functionality from the crawl."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/360","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/360","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 confirms pricing and payment details. However, no OpenAPI schema, no request/response examples, and no accessible documentation (all doc pages just show 'Connect wallet') make it impossible to determine what this specific endpoint actually does beyond its generic 'Premium API Access' 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'/request':13,30 '0.02':12,29,63,133,197 '000':122 '0x8335':127 '20':121 '2913':128 '300':150 '6':137 'Base network API' 'USDC micropayment API' 'accept':141 'access':109 'advertis':116,155 'ai':167 'ai-inference' 'ai/ml':53 'amount':119 'analysi':171 'analyt':52,161 'api':5,15,22,32,41,81,108 'appear':204 'application/json':112 'attach':91 'avail':218 'base':8,25,71,123,130 'broad':46 'broader':153 'call':4,21,199 'caller':89 'categori':159 'challeng':115 'classif':174 'classification' 'collect':47 'connect':209 'convers':190 'cost':62 'crawl':221 'crypto-paid API' 'crypto-quotes' 'data':51,56,160,164 'data-analytics' 'decim':138 'detail':213 'document':200 'embed':175 'embeddings' 'enabl':40 'endpoint':49,61,101,140,156 'equal':132 'estim':185 'everi':60 'exchang':180 'exist':202 'export':165 'feed':179 'financ':176 'finance-data' 'finance/web3':55 'four':158 'gas':184 'generat':191 'geocod':188 'geocoding' 'given':134 'header':95 'ident':195 'infer':54 'infrastructur':187 'insight':166 'key':16,33,82 'learn':169 'limit':85 'list':105 'low fee API' 'lowpaymentfee.com':35 'machin':168 'max':118 'metric':162 'network':9,26,72 'no-api-key' 'offer':44 'on-demand API' 'page':201 'paid':66 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request' 'payment':76,94,147 'per':3,20,64,198 'platform':6,23,42,154 'post':142 'premium':107 'price':178,194 'protocol':77 'quot':183 'rate':84,181 'report':163 'request':65,98,143 'request/response':214 'requir':17,34,206 'return':111 'schema':215 'second':151 'sentiment':170 'sentiment-analysis' 'servic':59 'simpli':90 'span':50 'specif':100 'subscript':88 'summar':173 'text':172 'text-summarization' 'timeout':148 'token':182 'unit':124 'usdc':68,126,135 'usdc-base' 'use':73 'util':58 'valid':189 'via':10,27 'view':211 'wallet':208 'web3':177 'x402':11,28,39,75,93,114 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"da2b1a20-964e-4923-98a0-64e71827d6ba","listingId":"afa737fe-2fe3-4cc8-816d-03974719887d","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/360","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:16.199Z"}],"sources":[{"listingId":"afa737fe-2fe3-4cc8-816d-03974719887d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/360","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:16.199Z","lastSeenAt":"2026-04-22T10:32:22.042Z"}],"details":{"listingId":"afa737fe-2fe3-4cc8-816d-03974719887d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/360 \\\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 cost $0.02 per request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/transactions/360 advertises maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/transactions/360"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time crypto prices, gas estimates, or exchange rates with per-call payment","Running data analytics queries or exporting data with no subscription commitment","Geocoding, validation, or conversion utilities paid per request via x402"],"bestFor":["AI agents that can settle x402 payments in USDC on Base","Developers who want zero-commitment, pay-as-you-go API access","Use cases requiring small, infrequent API calls where subscriptions are wasteful"],"notFor":["High-volume callers who would benefit from bulk pricing or subscriptions","Users without a Base-compatible USDC wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.381Z"},"updatedAt":"2026-04-22T10:32:22.042Z"}}