{"id":"5438f3b0-8ce7-45d5-b5a3-1575c2ab7853","shortId":"tFG7mr","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an X-PAYMENT header with a valid x402 payment proof to access any endpoint.\n\nThe specific endpoint at `/api/v1/transactions/202` is listed as \"Premium API Access\" and returns `application/json`. The x402 challenge confirms it is live, accepting POST requests, and requires a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on the Base network. The payment is settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.\n\nThe platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation beyond the landing page is extremely sparse (docs, pricing, and API pages all render only a \"Connect wallet\" prompt), so the actual functionality, request schemas, and response formats for each endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-auth api"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all return only a 'Connect wallet' prompt with no usable content.","No OpenAPI or schema definition is available; request and response formats are unknown.","The purpose of '/api/v1/transactions/202' specifically is unclear — 'Premium API Access' is a generic label.","Multiple endpoint categories are advertised but none can be verified for actual functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/202","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/202","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages render only a wallet-connect prompt. The actual functionality behind '/api/v1/transactions/202' and the other listed endpoints is unverifiable from available 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'/request':19,38 '0.02':18,37,70,150,203 '000':145 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':167 '20':144 '300':170 '6':155 'accept':136 'access':112,125 'actual':229 'addit':176 'address':166 'advertis':175 'ai':12,31,57 'ai-inference' 'analysi':180 'analyt':56 'api':5,24,45,88,124,218 'application/json':128 'attach':99 'base':8,27,78,146,159 'base network api' 'beyond':208 'broad':50 'call':4,23 'caller':97 'challeng':131 'classif':183 'classification' 'commit':96 'confirm':132 'connect':224 'convers':195 'cover':10,29 'crypto-quotes' 'data':11,30,55,197 'data-analytics' 'decim':156 'doc':215 'document':207 'embed':184 'embeddings' 'enabl':44 'endpoint':16,35,53,66,114,117,177,238 'estim':192 'everi':65 'exchang':187 'extrem':213 'feed':186 'financ':13,32,60 'finance-data' 'format':235 'function':230 'gas':191 'generat':198 'geocod':193 'geocoding' 'header':104 'howev':206 'includ':178 'infrastructur':63 'key':89 'land':210 'learn':59 'limit':92 'list':121 'live':135 'low payment fee' 'lowpaymentfee.com':39 'machin':58 'maximum':142 'micropayment api' 'minimum':95 'network':79,160 'no-auth api' 'offer':48 'page':211,219 'paid':73 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':83,103,109,162 'per':3,22,71 'platform':6,25,46,174 'point':205 'post':137 'premium':123 'price':68,185,204,216 'prompt':226 'proof':110 'protocol':84 'quot':190 'rate':91,188 'render':221 'request':72,138,231 'requir':140 'respons':234 'return':127 'schema':232 'second':171 'sentiment':179 'sentiment-analysis' 'set':51 'settl':164 'simpli':98 'sinc':152 'span':54 'spars':214 'specif':116 'summar':182 'text':181 'text-summarization' 'timeout':172 'token':189 'unit':147 'unknown':240 'usd':151 'usdc':9,28,75,149,153 'usdc api' 'usdc-base-network' 'use':154 'util':15,34,64 'utility-apis' 'valid':107,194 'via':80 'wallet':225 'web3':61 'x':102 'x-payment':101 'x402':43,82,108,130 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"b48f01f7-ac17-4c26-b373-a003a092122d","listingId":"5438f3b0-8ce7-45d5-b5a3-1575c2ab7853","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/202","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:10.285Z"}],"sources":[{"listingId":"5438f3b0-8ce7-45d5-b5a3-1575c2ab7853","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/202","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:10.285Z","lastSeenAt":"2026-04-22T21:31:37.610Z"}],"details":{"listingId":"5438f3b0-8ce7-45d5-b5a3-1575c2ab7853","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/202 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/transactions/202 requires maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/transactions/202"},{"claim":"Available endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification) without API key management","Fetching real-time crypto token quotes and gas estimates via micropayment","Geocoding and data validation as a utility service with no subscription commitment","Exporting analytics data or generating reports on a per-request basis"],"bestFor":["AI agents that need keyless, pay-per-call access to diverse API endpoints","Developers prototyping with low-cost, no-commitment API access","Web3-native applications already operating on the Base network"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation and guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.041Z"},"updatedAt":"2026-04-22T21:31:37.610Z"}}