{"id":"cdefea31-1694-4fea-b454-564be564b746","shortId":"Nuz9nB","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 collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are paid per-request using USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint at `/api/v1/invoices/14` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, which equals $0.02 USD (USDC uses 6 decimals). Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02/request price point. However, documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior and response schemas of these endpoints remain undocumented and unverified.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","utility-services"],"categories":["llm","data","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","low fee API","crypto-paid API"],"warnings":["No API documentation available — docs, pricing, and README pages all return only 'Connect wallet' with no content.","No request or response schema provided for any endpoint; actual behavior is unknown.","The endpoint path '/api/v1/invoices/14' with description 'Premium API Access' is vague and does not clarify what data or service is returned.","The platform lists many endpoints on its landing page but none have been independently verified for functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/invoices/14","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/invoices/14","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documented request/response formats, and all documentation pages return only a wallet-connect prompt. The actual functionality behind 'Premium API Access' at /api/v1/invoices/14 is 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'/request':19,38,173 '0.02':18,37,125,172 '000':115 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':136 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':120 '20':114 '300':139 '6':129 'Base network API' 'USDC API' 'accept':103 'access':101 'actual':194 'addit':146 'address':135 'advertis':145 'ai':12,31 'ai-inference' 'ai/ml':56 'analysi':150 'analyt':55 'api':5,24,45,82,100 'base':8,27,75,116,122 'behavior':195 'broader':143 'call':4,23 'challeng':108 'classif':153 'classification' 'collect':50 'commit':90 'connect':185 'content':191 'convers':165 'cost':112 'crypto-paid API' 'crypto-quotes' 'data':11,30,54,59 'data-analytics' 'decim':130 'doc':179 'document':177 'embed':154 'embeddings' 'enabl':44 'endpoint':16,35,52,65,93,147,201 'equal':124 'estim':162 'exchang':157 'feed':156 'financ':13,32 'finance-data' 'finance/web3':58 'gas':161 'gas-estimates' 'general':61 'generat':167 'geocod':163 'geocoding' 'howev':176 'includ':148 'indic':109 'infer':57 'key':83 'limit':86 'list':97 'low fee API' 'lowpaymentfee.com':39 'maximum':111 'micropayment API' 'network':76 'offer':10,29 'page':178 'paid':67 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request' 'payment':131 'per':3,22,69 'per-request':68 'platform':6,25,46,144 'point':175 'post':104 'premium':99 'price':155,174,180 'prompt':187 'protocol':80 'provid':48 'quot':160 'rate':85,158 'readm':181 'remain':202 'request':70,105 'respons':197 'return':182 'schema':198 'second':140 'sent':133 'sentiment':149 'sentiment-analysis' 'servic':63 'span':53 'specif':92 'substant':190 'summar':152 'text':151 'text-summarization' 'timeout':141 'token':159 'undocu':203 'unit':117 'unverifi':205 'upfront':89 'usd':126 'usdc':9,28,72,119,127 'usdc-base' 'use':71,128 'util':15,34,62 'utility-services' 'valid':164 'via':77 'wallet':186 'x402':43,79,107 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"cd57f9f3-b9e5-4867-959c-9f93254d9fb8","listingId":"cdefea31-1694-4fea-b454-564be564b746","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/invoices/14","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:42.716Z"}],"sources":[{"listingId":"cdefea31-1694-4fea-b454-564be564b746","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/invoices/14","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:42.716Z","lastSeenAt":"2026-04-23T16:06:41.401Z"}],"details":{"listingId":"cdefea31-1694-4fea-b454-564be564b746","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/invoices/14 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns 402 with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/invoices/14"},{"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 platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/invoices/14"}],"useCases":["Accessing AI inference (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 or data validation tasks with instant pay-as-you-go pricing","Exporting data or generating analytics reports via micropayment-gated endpoints"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","Agents or bots that can settle payments in USDC on Base via x402","Projects needing low-cost micropayment-gated utility and AI endpoints"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring high-throughput bulk access at volume-discounted rates","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.159Z"},"updatedAt":"2026-04-23T16:06:41.401Z"}}