{"id":"ced46cce-597e-447b-888d-3610e40e752d","shortId":"vc9CEu","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/ML inference, finance/Web3, and infrastructure utilities. All endpoints are paid per-request using USDC on the Base network, with no API keys, no rate limits, and no commitments required. The specific endpoint at `/api/v1/transactions/305` is labeled \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0.02 USD) on Base.\n\nThe platform advertises four broad categories of APIs: 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 are listed at $0.02 per request. The x402 challenge confirms the endpoint is live, uses the \"exact\" payment scheme, and accepts USDC at contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the `/api/v1/transactions/305` endpoint actually returns. The endpoint's purpose beyond the generic \"Premium API Access\" label is unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["multi-purpose","ai","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all show only 'Connect wallet'","No OpenAPI spec or request/response schema provided","The specific purpose of /api/v1/transactions/305 ('Premium API Access') is unclear and undocumented","Cannot verify what data or functionality this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/305","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/transactions/305","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is zero documentation on what this specific endpoint does, no request/response schemas, and all doc pages render only 'Connect wallet'. The endpoint label 'Premium API Access' is generic and uninformative. Effectively a stub 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'/api/v1/transactions/305':82,212 '/docs':180 '/pricing':182 '/readme':184 '/request':13,28 '0.02':12,27,102,150 '000':97 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':172 '20':96 '402 payment api' 'accept':167 'access':87,225 'across':45 'actual':214 'address':171 'advertis':108 'ai':121 'ai-inference' 'ai/ml':48 'analysi':125 'analyt':47,115 'api':5,20,37,69,86,113,224 'base':8,23,65,98,105,174 'base network api' 'beyond':220 'broad':110 'call':4,19 'categori':111 'challeng':92,155 'classif':128 'classification' 'commit':76 'confirm':156 'connect':190 'content':196 'contract':170 'convers':144 'data':46,114,118 'data-analytics' 'document':175,205 'embed':129 'embeddings' 'enabl':36 'endpoint':44,55,80,158,213,217 'estim':139 'exact':163 'exampl':208 'exchang':134 'export':119 'extrem':177 'feed':133 'financ':130 'finance-data' 'finance/web3':50 'four':109 'gas':138 'generat':145 'generic':222 'geocod':142 'geocoding' 'infer':49 'infrastructur':52,141 'insight':120 'key':70 'label':84,226 'learn':123 'limit':73 'list':148 'live':160 'low payment fee' 'lowpaymentfee.com':31 'machin':122 'metric':116 'micropayment api' 'network':9,24,66 'no-api-key' 'offer':40 'openapi':200 'page':185 'paid':57 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':164 'per':3,18,59,151 'per-request':58 'platform':6,21,38,107 'premium':85,223 'price':132 'prompt':192 'purpos':219 'quot':137 'rate':72,135 'render':187 'report':117 'request':60,93,152 'request/response':203 'requir':77 'return':89,215 'schema':204 'scheme':165 'sentiment':124 'sentiment-analysis' 'spars':178 'spec':201 'specif':79 'summar':127 'text':126 'text-summarization' 'token':136 'unclear':228 'unit':99 'usd':103 'usdc':15,30,62,101,168 'usdc api' 'usdc-base' 'use':61,161 'util':53 'utility-apis' 'valid':143 'varieti':42 'via':10,25 'wallet':191 'web3':131 'x402':11,26,35,91,154 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"ebe12343-bf7b-4d08-b171-a77449412cc4","listingId":"ced46cce-597e-447b-888d-3610e40e752d","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/transactions/305","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:25:50.768Z"}],"sources":[{"listingId":"ced46cce-597e-447b-888d-3610e40e752d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/305","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:50.768Z","lastSeenAt":"2026-04-22T11:32:22.920Z"}],"details":{"listingId":"ced46cce-597e-447b-888d-3610e40e752d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/305 \\\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 are 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":"The x402 challenge for /api/v1/transactions/305 requests maxAmountRequired of 20000 base units of USDC (USD Coin) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/305"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/305"},{"claim":"Platform offers APIs 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 financial data like price feeds, exchange rates, and gas estimates on a per-call basis","Running data analytics queries and exporting data with micropayments","Using utility services like geocoding, validation, and conversion via x402"],"bestFor":["Agents or developers wanting zero-signup, pay-per-use API access","Crypto-native workflows that can settle USDC on Base","Low-volume or sporadic API usage where subscriptions are wasteful"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume production workloads requiring predictable bulk pricing","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.616Z"},"updatedAt":"2026-04-22T11:32:22.920Z"}}