{"id":"40d45ef4-eb40-42de-8064-4eaccc3f1e02","shortId":"P79WcJ","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 variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint at `/api/v1/charges/82` is labeled \"Premium API Access\" and returns a 402 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 via the x402 exact scheme. The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises endpoints for 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 pages (docs, pricing, API reference) returned only a \"Connect wallet\" prompt with no substantive content, so the actual capabilities and response schemas of individual endpoints remain unverified beyond the landing page descriptions.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["llm","data","finance","geo","infrastructure"],"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 actual content","No OpenAPI or schema available — request/response formats for this endpoint are unknown","The endpoint is labeled 'Premium API Access' but there is no description of what data or functionality it provides","The broader platform lists many endpoints but none have documented schemas or example payloads"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/82","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/charges/82","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, but documentation pages are empty (only 'Connect wallet' stubs). There is no OpenAPI schema, no example requests/responses, and no detail on what 'Premium API Access' actually returns. The listing is effectively a stub with pricing info 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'/request':13,28 '0.02':12,27,62,113,164 '000':102 '0x8335':107 '20':101 '2913':108 '402':96 '6':117 'accept':128 'access':92 'across':45 'actual':186 'advertis':137 'ai':48 'ai-inference' 'analysi':141 'analyt':47 'api':5,20,37,74,91,172 'application/json':133 'base':8,23,70,103,110 'base network api' 'beyond':196 'broader':135 'call':4,19 'capabl':187 'categori':56 'challeng':97 'classif':144 'classification' 'commit':81 'connect':177 'content':183 'convers':156 'crypto-quotes' 'data':46,158 'data-analytics' 'decim':118 'descript':200 'doc':170 'document':168 'embed':145 'embeddings' 'enabl':36 'endpoint':44,58,85,127,138,193 'equal':112 'estim':153 'exact':124 'exchang':148 'feed':147 'financ':51 'finance-data' 'gas':152 'generat':159 'geocod':154 'geocoding' 'given':114 'howev':167 'individu':192 'infrastructur':54 'key':75 'label':89 'land':198 'learn':50 'limit':78 'low payment fee' 'lowpaymentfee.com':31 'machin':49 'micropayment api' 'network':9,24,71 'no-auth api' 'offer':40 'page':169,199 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payabl':65 'payment':119 'per':3,18,63 'platform':6,21,38,136 'point':166 'post':129 'premium':90 'price':60,146,165,171 'prompt':179 'quot':151 'rate':77,149 'refer':173 'remain':194 'request':64,98,130 'requir':82 'respons':189 'return':94,132,174 'schema':190 'scheme':125 'sentiment':140 'sentiment-analysis' 'specif':84 'substant':182 'summar':143 'text':142 'text-summarization' 'token':150 'unit':104 'unverifi':195 'usdc':15,30,67,106,115 'usdc api' 'usdc-base' 'util':55 'utility-services' 'valid':155 'varieti':42 'via':10,25,121 'wallet':178 'web3':52 'x402':11,26,35,123 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"02731fb5-0f85-47fe-9c7f-df2808ddc819","listingId":"40d45ef4-eb40-42de-8064-4eaccc3f1e02","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/charges/82","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:32.024Z"}],"sources":[{"listingId":"40d45ef4-eb40-42de-8064-4eaccc3f1e02","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/82","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:32.024Z","lastSeenAt":"2026-04-23T06:31:02.847Z"}],"details":{"listingId":"40d45ef4-eb40-42de-8064-4eaccc3f1e02","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/82 \\\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 priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/82"},{"claim":"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 crypto quotes, gas estimates, and exchange rates on a per-call basis","Running geocoding, validation, or data conversion tasks with micropayments","Integrating pay-per-use data analytics and reporting into agent workflows"],"bestFor":["Agents needing low-friction, keyless API access via x402 micropayments","Developers who want to avoid subscription commitments for occasional API calls","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-request pricing at $0.02 adds up quickly","Users who need detailed API documentation, SDKs, or guaranteed SLAs","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.306Z"},"updatedAt":"2026-04-23T06:31:02.847Z"}}