{"id":"6c97680f-1139-44de-850b-5472eef0e213","shortId":"xWt6rJ","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 data, and utility services. All endpoints are paid per-request using the x402 protocol, settling in USDC on the Base network. The specific endpoint at `/api/v1/transactions/363` is labeled \"Premium API Access\" and accepts POST requests with a maximum cost of 20,000 base units of USDC (i.e., $0.02 per call, since USDC uses 6 decimals).\n\nThe platform advertises categories including 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 listed endpoints share the same $0.02 per-request pricing. The platform emphasizes no API keys, no rate limits, no minimums, and instant access.\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 documentation for any endpoint. The specific functionality of the `/api/v1/transactions/363` endpoint beyond its \"Premium API Access\" label is unclear.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","post-endpoint","no-api-key","pay-per-use"],"categories":["api-platform","finance","ai-ml","data"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /docs, /pricing, /api, and /README pages contain no useful content — only a 'Connect wallet' prompt","The specific functionality of /api/v1/transactions/363 ('Premium API Access') is not documented anywhere","No request body schema or response format is described; integration requires trial and error","The broad range of advertised capabilities (AI, analytics, finance, utilities) at a uniform $0.02 price with no documentation raises questions about actual service quality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/363","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/363","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC per request on Base). However, there is no OpenAPI schema, no request/response examples, no documentation beyond a landing page listing, and the specific purpose of /api/v1/transactions/363 is undefined. The docs, pricing, and README pages are all empty wallet-connect 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'/api/v1/transactions/363':77,212 '/docs':175 '/pricing':177 '/readme':179 '/request':13,28 '0.02':12,27,99,151 '000':93 '20':92 '6':105 'Base network API' 'USDC API' 'accept':84 'access':82,169,218 'across':45 'advertis':109 'ai':119 'ai/ml':48 'analysi':123 'analyt':47,113 'api':5,20,37,81,160,217 'base':8,23,71,94 'base-network' 'beyond':214 'call':4,19,101 'categori':110 'classif':126 'connect':185 'content':191 'convers':143 'cost':90 'data':46,51,112,116 'decim':106 'detail':202 'document':170,203 'embed':127 'emphas':158 'enabl':36 'endpoint':44,56,75,147,206,213 'estim':137 'exampl':199 'exchang':132 'export':117 'extrem':172 'feed':131 'financ':128 'finance/web3':50 'function':209 'gas':136 'generat':144 'geocod':141 'i.e':98 'includ':111 'infer':49 'infrastructur':139 'insight':118 'instant':168 'key':161 'label':79,219 'learn':121 'limit':164 'list':146 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':120 'maximum':89 'metric':114 'micropayment API' 'minimum':166 'network':9,24,72 'no-api-key' 'offer':40 'openapi':195 'page':180 'paid':58 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-use' 'per':3,18,60,100,153 'per-request':59,152 'per-request-billing' 'platform':6,21,38,108,157 'post':85 'post-endpoint' 'premium':80,216 'premium API access' 'price':130,155 'prompt':187 'protocol':65 'quot':135 'rate':133,163 'render':182 'report':115 'request':61,86,154 'request/response':198 'schema':196 'sentiment':122 'servic':54 'settl':66 'share':148 'sinc':102 'spars':173 'specif':74,208 'substant':190 'summar':125 'text':124 'token':134 'unclear':221 'unit':95 'usdc':15,30,68,97,103 'usdc-settlement' 'use':62,104 'util':53,140 'valid':142 'varieti':42 'via':10,25 'wallet':186 'web3':129 'x402':11,26,35,64 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"c43e1c2e-3ec6-451d-8c4d-f3f49bc11f53","listingId":"6c97680f-1139-44de-850b-5472eef0e213","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/363","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:23.469Z"}],"sources":[{"listingId":"6c97680f-1139-44de-850b-5472eef0e213","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/363","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:23.469Z","lastSeenAt":"2026-04-23T11:31:27.858Z"}],"details":{"listingId":"6c97680f-1139-44de-850b-5472eef0e213","quickStartSnippet":"# POST with x402 payment header (USDC on Base)\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/363 \\\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, 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 network","source_url":"https://lowpaymentfee.com/api/v1/transactions/363"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to analytics, AI, finance, or utility endpoints without subscription commitments","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Accessing sentiment analysis, summarization, or classification models via pay-per-request"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access via crypto","AI agents that can settle x402 payments on Base in USDC","Users who need low-cost per-request API calls without API key management"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone unable to pay with USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.032Z"},"updatedAt":"2026-04-23T11:31:27.858Z"}}