{"id":"bd1a9ed3-f5a0-4210-ad82-b0f7c6cad31c","shortId":"fELkqc","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/crypto market data, and general-purpose utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no upfront commitments — callers simply attach an X-PAYMENT header with a valid payment proof to each request.\n\nThe specific endpoint at `/api/resource/42` is listed as \"Premium API Access\" and returns `application/json`. The x402 challenge confirms it accepts POST requests and charges a maximum of 20,000 base-unit USDC (i.e., $0.02) per call, paid to address `0x1A2B…85F3` on Base. The broader site advertises four endpoint categories: Data & Analytics (metrics, reports, export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation).\n\nDocumentation is extremely thin — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. No OpenAPI spec, request/response schemas, or usage examples are available from the crawl. Because of this, the actual behavior and output format of each endpoint cannot be verified beyond the x402 challenge metadata.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-prices","exchange-rates","crypto-gas","geocoding","validation","conversion"],"categories":["ai","finance","data","utilities"],"synonyms":["low payment fee API","x402 API","pay-per-call API","USDC API","Base network API","micropayment API","sentiment analysis API","text summarization API","crypto price feed"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior is unverifiable","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The specific endpoint /api/resource/42 does not appear in the site's listed API catalog — it may be a demo or test resource","Response format and fields are unknown; example_response_json is null"],"endpointUrl":"https://lowpaymentfee.com/api/resource/42","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/resource/42","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 confirms pricing and payment details, but there is zero documentation beyond the landing page listing. No OpenAPI spec, no request/response schemas, no examples, and all doc pages render only 'Connect wallet'. The actual functionality of /api/resource/42 is 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'/api/resource/42':117 '/docs':201 '/pricing':202 '/readme':205 '/request':18,36 '0.02':17,35,70,147 '000':141 '0x1a2b':153 '20':140 '85f3':154 'Base network API' 'USDC API' 'accept':132 'access':123 'actual':236 'address':152 'advertis':160 'ai':12,30,170 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':55 'analysi':174 'analyt':11,29,54,165 'api':5,23,43,88,122 'application/json':126 'attach':99 'avail':228 'base':8,26,78,143,156 'base-unit':142 'behavior':237 'beyond':247 'broad':48 'broader':158 'call':4,22,149 'caller':97 'cannot':244 'categori':163 'challeng':129,250 'charg':136 'classif':177 'collect':49 'commit':96 'confirm':130 'connect':211 'convers':194 'conversion' 'cover':10,28 'crawl':231 'crypto price feed' 'crypto-gas' 'data':53,59,164 'data-analytics' 'detail':218 'document':196 'embed':178 'enabl':42 'endpoint':51,66,115,162,243 'estim':188 'everi':65 'exampl':226 'exchang':183 'exchange-rates' 'export':168 'extrem':198 'feed':182 'financ':13,31,179 'finance-prices' 'finance/crypto':57 'format':240 'four':161 'gas':187 'general':62 'general-purpos':61 'generat':195 'geocod':192 'geocoding' 'header':104 'i.e':146 'infer':56 'infrastructur':190 'insight':169 'key':89 'learn':172 'limit':92 'list':119 'low payment fee API' 'lowpaymentfee.com':37 'machin':171 'market':58 'maximum':138 'metadata':251 'metric':166 'micropayment API' 'network':79 'offer':46 'openapi':220 'output':239 'page':206 'paid':150 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payment':83,103,108 'per':3,21,71,148 'platform':44 'post':133 'premium':121 'price':68,181 'prompt':213 'proof':109 'protocol':84 'purpos':63 'quot':186 'rate':91,184 'render':208 'report':167 'request':72,112,134 'request/response':222 'return':125 'schema':223 'sentiment':173 'sentiment analysis API' 'settl':73 'simpli':98 'site':159 'span':52 'spec':221 'specif':114 'suit':6,24 'summar':176 'technic':217 'text':175 'text summarization API' 'thin':199 'token':185 'unit':144 'upfront':95 'usag':225 'usdc':9,27,75,145 'usdc-base' 'util':15,33,64,191 'valid':107,193 'validation' 'verifi':246 'via':80 'wallet':212 'web3':180 'x':102 'x-payment':101 'x402':41,82,128,249 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"fd580e31-9ab1-4f05-9105-0bbe8daaba9c","listingId":"bd1a9ed3-f5a0-4210-ad82-b0f7c6cad31c","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/resource/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:35.503Z"}],"sources":[{"listingId":"bd1a9ed3-f5a0-4210-ad82-b0f7c6cad31c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/42","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:35.503Z","lastSeenAt":"2026-04-22T21:30:32.786Z"}],"details":{"listingId":"bd1a9ed3-f5a0-4210-ad82-b0f7c6cad31c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/42 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/resource/42","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-proof>","Content-Type":"application/json"}},"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 confirms maxAmountRequired of 20000 base-unit USDC ($0.02) on Base for /api/resource/42","source_url":"https://lowpaymentfee.com/api/resource/42"},{"claim":"Site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only 'Connect wallet' with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Running sentiment analysis or text summarization without managing API keys or subscriptions","Fetching real-time crypto token quotes and gas estimates on a per-call payment basis","Geocoding addresses or validating data with zero upfront commitment","Exporting analytics data or generating insights with pay-as-you-go pricing","Generating embeddings for downstream ML pipelines"],"bestFor":["Agents or bots that need instant, keyless API access via crypto micropayments","Developers prototyping across multiple API categories (AI, finance, utilities) at low cost","x402-compatible wallets and autonomous agents on the Base network"],"notFor":["Production workloads requiring documented request/response schemas and SLAs","Users who need fiat billing or cannot transact in USDC on Base","High-throughput batch processing where per-call overhead matters"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.498Z"},"updatedAt":"2026-04-22T21:30:32.786Z"}}