{"id":"73e9b665-efa4-4305-993f-e6346bf1d619","shortId":"yUSPgS","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 paid per-request using USDC on the Base network at a flat rate of $0.02 per call, with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint at `/api/v1/payments/348` is listed as \"Premium API Access\" and returns a valid x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme by including an X-PAYMENT header. 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 at /docs, /pricing, and /api but currently render only a \"Connect wallet\" prompt with no substantive content, so detailed request/response schemas for individual endpoints are unavailable.","tags":[],"capabilities":["x402-payment","per-request-pricing","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-services"],"categories":["llm","data","finance","geo"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","low fee API","crypto-paid API"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no usable content.","The specific purpose of /api/v1/payments/348 ('Premium API Access') is not documented — it is unclear what data or service it returns.","No OpenAPI spec or request/response schema is available for any endpoint.","No information on uptime, SLAs, or rate limits beyond the marketing claim of 'no rate limits'."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/348","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/payments/348","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 pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no content. The specific functionality behind '/api/v1/payments/348' ('Premium API Access') is vague and 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'/api/v1/payments/348':93 '/docs':194 '/pricing':195 '/request':13,28 '0.02':12,27,74,121 '000':110 '0x8335':115 '20':109 '2913':116 '6':125 'Base network API' 'USDC API' 'accept':144 'access':99 'advertis':153 'ai':165 'ai-inference' 'ai/ml':49 'analysi':169 'analyt':48,159 'api':5,20,37,79,98 'application/json':149 'base':8,23,67,111,118 'broad':42 'broader':151 'call':4,19,76 'catalog':43 'categori':157 'challeng':105 'classif':172 'classification' 'commit':87 'connect':203 'content':209 'convers':188 'crypto-data' 'crypto-paid API' 'current':199 'data':47,52,158,162 'data-analytics' 'decim':126 'detail':211 'document':190 'embed':173 'embeddings' 'enabl':36 'endpoint':45,57,91,143,154,216 'equal':120 'estim':183 'exact':133 'exchang':178 'exist':192 'export':163 'feed':177 'financ':174 'finance-data' 'finance/web3':51 'flat':71 'four':156 'gas':182 'generat':189 'geocod':186 'geocoding' 'given':122 'header':141 'includ':136 'individu':215 'infer':50 'infrastructur':185 'insight':164 'key':80 'learn':167 'limit':83 'list':95 'low fee API' 'lowpaymentfee.com':31 'machin':166 'made':129 'metric':160 'micropayment API' 'minimum':86 'network':9,24,68 'offer':40 'page':191 'paid':59 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'payment':127,140 'per':3,18,61,75 'per-request':60 'per-request-pricing' 'platform':6,21,38,152 'post':145 'premium':97 'price':176 'prompt':205 'quot':181 'rate':72,82,179 'render':200 'report':161 'request':62,106,146 'request/response':212 'requir':88 'return':101,148 'schema':213 'scheme':134 'sentiment':168 'sentiment-analysis' 'servic':55 'span':46 'specif':90 'substant':208 'summar':171 'text':170 'text-summarization' 'token':180 'unavail':218 'unit':112 'usdc':15,30,64,114,123 'usdc-base' 'use':63 'util':54 'utility-services' 'valid':103,187 'via':10,25,130 'wallet':204 'web3':175 'x':139 'x-payment':138 'x402':11,26,35,104,132 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"7186875c-872d-44f7-9ac2-c0380de88349","listingId":"73e9b665-efa4-4305-993f-e6346bf1d619","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/payments/348","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:31.961Z"}],"sources":[{"listingId":"73e9b665-efa4-4305-993f-e6346bf1d619","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/348","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:31.961Z","lastSeenAt":"2026-04-23T03:31:33.951Z"}],"details":{"listingId":"73e9b665-efa4-4305-993f-e6346bf1d619","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/348 \\\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":"Flat pricing of $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 returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/payments/348"},{"claim":"Platform offers 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 substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes, gas estimates, or exchange rates with per-call payment","Running geocoding or data validation utilities with zero setup and pay-as-you-go pricing","Exporting analytics data or generating insights reports via programmatic access"],"bestFor":["AI agents needing keyless, pay-per-call access to diverse utility endpoints","Developers who want to avoid subscription commitments and pay only for usage","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume batch processing where per-call pricing at $0.02 would be cost-prohibitive","Users who need detailed API documentation or guaranteed SLAs (docs are currently sparse)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.787Z"},"updatedAt":"2026-04-23T03:31:33.951Z"}}