{"id":"29d7ec1b-fe17-4285-8b82-05e7b773de03","shortId":"Bd8UNJ","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of endpoints across 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 utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/transactions/340` is listed as \"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 made via the x402 exact scheme with a 300-second timeout. No API keys or rate limits are advertised; access is instant once payment is settled.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the `/api/v1/transactions/340` endpoint actually returns. The landing page lists many endpoints but provides no documentation on input parameters or output formats for any of them. The purpose of this specific \"transactions/340\" endpoint is unclear from available material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"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, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format for any endpoint","The specific endpoint /api/v1/transactions/340 is labeled 'Premium API Access' but its actual function is undocumented and unclear","No request or response examples available anywhere in crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/340","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/340","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of the specific /api/v1/transactions/340 endpoint is unclear. The docs, pricing, and README pages are all blank beyond a wallet connect 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'/api/v1/transactions/340':113,211 '/docs':179 '/pricing':181 '/readme':183 '/request':19,38 '0.02':18,37,95,140 '000':129 '0x8335':134 '20':128 '2913':135 '300':156 '402':123 '402 payment api' '6':144 'access':119,167 'across':54 'actual':213 'advertis':166 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,118,160 'avail':245 'base':8,27,103,130,137 'base network api' 'broad':50 'call':4,23 'catalog':51 'categori':56 'challeng':124 'classif':71 'classification' 'connect':189 'content':195 'convers':88 'data':11,30,57,61 'data-analytics' 'decim':145 'descript':207 'detail':206 'document':174,224 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,212,220,241 'equal':139 'estim':82 'exact':152 'exampl':203 'exchang':77 'export':62 'extrem':176 'feed':76 'financ':13,32,73 'finance-data' 'format':230 'four':55 'gas':81 'generat':89 'geocod':86 'geocoding' 'given':141 'infrastructur':84 'input':226 'insight':63 'instant':169 'key':161 'land':216 'learn':66 'limit':164 'list':115,218 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'made':148 'mani':219 'materi':246 'metric':59 'micropayment api' 'network':104 'offer':10,29 'openapi':199 'output':229 'page':184,217 'paid':98 'paramet':227 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':146,171 'per':3,22,96 'platform':6,25,46 'premium':117 'price':75,93 'prompt':191 'protocol':108 'provid':48,222 'purpos':236 'quot':80 'rate':78,163 'render':186 'report':60 'request':97,125 'request/response':202 'return':121,214 'schema':200 'scheme':153 'second':157 'sentiment':67 'sentiment-analysis' 'settl':173 'spars':177 'specif':110,239 'substant':194 'summar':70 'text':69 'text-summarization' 'timeout':158 'token':79 'transactions/340':240 'unclear':243 'unit':131 'usdc':9,28,100,133,142 'usdc api' 'usdc-base' 'util':15,34,85 'utility-apis' 'valid':87 'via':105,149 'wallet':190 'web3':74 'x402':43,107,151 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"60b6b0a8-7c1a-4f59-bb08-a026d641116a","listingId":"29d7ec1b-fe17-4285-8b82-05e7b773de03","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/340","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:04.113Z"}],"sources":[{"listingId":"29d7ec1b-fe17-4285-8b82-05e7b773de03","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/340","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:04.113Z","lastSeenAt":"2026-04-22T19:32:18.284Z"}],"details":{"listingId":"29d7ec1b-fe17-4285-8b82-05e7b773de03","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/340 \\\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 402 challenge requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/340"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting data with instant crypto-settled micropayments","Using utility services like geocoding and validation without subscription commitments"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing lightweight access to multiple API categories without managing API keys"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Developers unfamiliar with crypto wallets or x402 payment flows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.903Z"},"updatedAt":"2026-04-22T19:32:18.284Z"}}