{"id":"439d7b8e-41a7-4228-8aca-3c1496a392ab","shortId":"4GQVEP","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/generate/resource/150` is listed under \"Premium API Access\" and accepts POST requests with payment via the x402 protocol. The platform advertises a flat $0.02 per request across all endpoints, with no API keys, no rate limits, and instant access.\n\nThe platform organizes its APIs into 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 endpoints use the same x402 payment flow on Base with USDC (contract 0x8335…2913).\n\nThe probed endpoint returned a valid 402 challenge with a maxAmountRequired of 20000 base units. Since USDC uses 6 decimals, this equates to $0.02, consistent with the site's advertised pricing. Documentation pages (/docs, /pricing, /api, /README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schemas for this endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["llm","data","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","crypto api access","402 payment api"],"warnings":["No documentation available — all doc pages (/docs, /pricing, /api, /README) return only 'Connect wallet' with no content","No OpenAPI or schema definition found for any endpoint","The actual input parameters and response format for /api/v1/generate/resource/150 are unknown","The specific functionality of 'Premium API Access' is not described anywhere beyond the generic title"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/150","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/generate/resource/150","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and all doc pages return only 'Connect wallet'. The actual functionality behind 'Premium API Access' at /api/v1/generate/resource/150 is entirely 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'/api/v1/generate/resource/150':69 '/docs':195 '/pricing':196 '/readme':198 '/request':19,38 '0.02':18,37,91,185 '0x8335':160 '20000':174 '2913':161 '402':168 '402 payment api' '6':180 'accept':77 'access':75,106 'across':94 'actual':212 'advertis':88,191 'ai':12,31,122 'ai-inference' 'analysi':126 'analyt':116 'api':5,24,45,74,99,111 'base':8,27,63,156,175 'base network api' 'broad':50 'call':4,23 'catalog':51 'categori':114 'challeng':169 'classif':129 'classification' 'connect':203 'consist':186 'content':209 'contract':159 'convers':145 'crypto api access' 'data':11,30,115,119 'data-analytics' 'decim':181 'document':193 'embed':130 'embeddings' 'enabl':44 'endpoint':16,35,57,67,96,148,164,217 'equat':183 'estim':140 'exchang':135 'export':120 'feed':134 'financ':13,32,131 'finance-data' 'flat':90 'flow':154 'four':113 'gas':139 'generat':146 'geocod':143 'geocoding' 'infrastructur':142 'insight':121 'instant':105 'key':100 'learn':124 'limit':103 'list':71 'low payment fee' 'lowpaymentfee.com':39 'machin':123 'maxamountrequir':172 'metric':117 'micropayment api' 'network':64 'offer':10,29 'organ':109 'page':194 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':81,153 'per':3,22,55,92 'platform':6,25,46,87,108 'post':78 'premium':73 'price':133,192 'probe':163 'prompt':205 'protocol':85 'provid':48 'quot':138 'rate':102,136 'report':118 'request':56,79,93 'request/response':213 'return':165,200 'schema':214 'sentiment':125 'sentiment-analysis' 'settl':58 'sinc':177 'site':189 'specif':66 'substant':208 'summar':128 'text':127 'text-summarization' 'token':137 'unit':176 'unknown':219 'usdc':9,28,60,158,178 'usdc api' 'usdc-base' 'use':149,179 'util':15,34 'utility-apis' 'valid':144,167 'via':82 'wallet':204 'web3':132 'x402':43,84,152 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"56f6f2e5-0eca-483b-af55-13e071f81e8a","listingId":"439d7b8e-41a7-4228-8aca-3c1496a392ab","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/generate/resource/150","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:22.545Z"}],"sources":[{"listingId":"439d7b8e-41a7-4228-8aca-3c1496a392ab","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/150","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:22.545Z","lastSeenAt":"2026-04-23T14:30:38.552Z"}],"details":{"listingId":"439d7b8e-41a7-4228-8aca-3c1496a392ab","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/150 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/150"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/150"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, exchange rates, and gas estimates on a per-call basis","Running data analytics queries and exporting data with per-request billing","Using utility services like geocoding, validation, and conversion with no subscription commitment"],"bestFor":["Agents or developers who want zero-signup, pay-as-you-go API access","Use cases requiring low-cost micropayments per API call ($0.02)","Projects already operating on the Base network with USDC"],"notFor":["Users who need detailed API documentation or well-defined request/response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscription discounts","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.052Z"},"updatedAt":"2026-04-23T14:30:38.552Z"}}