{"id":"6e1ee75f-9ba7-4401-ae79-226814f6a944","shortId":"E6vuFp","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 pay-per-request endpoints across four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure. Each call costs $0.02 in USDC on the Base network, settled on-chain with no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint at `/api/v1/payments/194` is listed as \"Premium API Access.\" The x402 challenge confirms it is live, accepting POST requests and requiring up to 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 (USDC uses 6 decimals). Payment is made via the x402 exact scheme to the payTo address. The endpoint 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 per request 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 request/response schemas for individual endpoints are unknown.","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-apis"],"categories":["ai","finance","data","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","crypto api access"],"warnings":["No documentation available — docs, pricing, API, and README pages all render only 'Connect wallet'","No OpenAPI or request/response schema provided for any endpoint","The specific purpose of /api/v1/payments/194 ('Premium API Access') is unclear — it does not map to any of the named endpoints on the landing page","Cannot verify what data or functionality any endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/194","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/194","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 challenge with clear pricing. However, documentation is essentially nonexistent — every page beyond the landing returns only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no explanation of what 'Premium API Access' actually returns. The listing is effectively a stub with confirmed 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'/request':13,28 '0.02':12,27,65,123,174 '000':113 '0x8335':118 '20':112 '6':126 'accept':105 'access':97 'across':50 'actual':202 'address':139 'advertis':147 'ai':55 'ai-inference' 'analysi':151 'analyt':54 'api':5,20,37,78,96,191 'application/json':143 'base':8,23,70,114,120 'base network api' 'beyond':181 'broad':42 'broader':145 'call':4,19,63 'catalog':43 'categori':52 'chain':75 'challeng':100 'classif':154 'classification' 'confirm':101 'connect':197 'convers':166 'cost':64 'crypto api access' 'crypto-quotes' 'data':53,168 'data-analytics' 'decim':127 'doc':188 'document':180 'embed':155 'embeddings' 'enabl':36 'endpoint':49,89,141,148,207 'equal':122 'estim':163 'exact':134 'exchang':158 'extrem':186 'feed':157 'financ':58 'finance-data' 'four':51 'gas':162 'generat':169 'geocod':164 'geocoding' 'howev':179 'individu':206 'infrastructur':61 'key':79 'land':183 'learn':57 'limit':82 'list':93 'live':104 'low payment fee' 'lowpaymentfee.com':31 'machin':56 'made':130 'micropayment api' 'network':9,24,71 'offer':40 'on-chain':73 'page':184,192 'pay':2,17,46 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':45 'payment':128 'payto':138 'per':3,18,47,175 'platform':6,21,38,146 'point':178 'post':106 'premium':95 'price':156,177,189 'prompt':199 'quot':161 'rate':81,159 'render':194 'request':48,107,176 'request/response':203 'requir':86,109 'return':142 'schema':204 'scheme':135 'sentiment':150 'sentiment-analysis' 'settl':72 'spars':187 'specif':88 'subscript':85 'summar':153 'text':152 'text-summarization' 'token':160 'unit':115 'unknown':209 'usdc':15,30,67,117,124 'usdc api' 'usdc-base' 'use':125 'utility-apis' 'valid':165 'via':10,25,131 'wallet':198 'web3':59 'x402':11,26,35,99,133 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"1b160241-e326-4015-bdc1-ad40799d7c33","listingId":"6e1ee75f-9ba7-4401-ae79-226814f6a944","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/194","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:46.231Z"}],"sources":[{"listingId":"6e1ee75f-9ba7-4401-ae79-226814f6a944","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/194","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:46.231Z","lastSeenAt":"2026-04-22T15:01:35.562Z"}],"details":{"listingId":"6e1ee75f-9ba7-4401-ae79-226814f6a944","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/194 \\\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":"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 x402 challenge shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/194"},{"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, 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 paid per request via USDC on Base"],"bestFor":["AI agents that can settle x402 payments in USDC on Base","Developers wanting zero-commitment, no-signup API access","Low-volume or bursty workloads where per-call pricing is economical"],"notFor":["High-volume production workloads where $0.02/call adds up quickly","Users who need detailed API documentation or OpenAPI schemas before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.94Z"},"updatedAt":"2026-04-22T15:01:35.562Z"}}