{"id":"f953fbf7-38e5-49d7-9988-29a6e04071bb","shortId":"P9uKyS","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com offers a collection of x402-enabled API endpoints spanning 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 listed here (`/api/endpoint-1`) is described as \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0.02 USD). Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The endpoint accepts HTTP POST requests and returns `application/json` responses. No API keys or rate limits are advertised; access is gated purely by per-call micropayment.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI schema, no request/response examples, and no description of what `/api/endpoint-1` actually returns. The site lists 16 other named endpoints at versioned paths (e.g., `/api/v2/ai/sentiment`), but this endpoint's path (`/api/endpoint-1`) does not match any of them, so its specific functionality is unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","http-post"],"categories":["api-marketplace","crypto"],"synonyms":["x402 API","micropayment API","USDC API","Base network API","pay-per-call","lowpaymentfee","premium API access"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","The path /api/endpoint-1 does not match any of the 16 named endpoints listed on the site; its actual functionality is unknown","No OpenAPI schema or request/response examples provided","No information on what data or service this specific endpoint returns"],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-1","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/endpoint-1","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, confirming pricing and payment details. However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a wallet-connect prompt. The specific functionality of /api/endpoint-1 is undocumented and does not correspond to any of the named endpoints on the landing 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'/api/v2/ai/sentiment':217 '/request':18,36 '0.02':17,35,88,130 '000':125 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':137 '16':209 '20':124 'Base network API' 'USDC API' 'accept':142 'access':113,158 'actual':204 'addit':187 'address':136 'advertis':157 'ai':12,30,57 'analysi':61 'analyt':11,29,51 'api':5,23,45,112,151,173 'application/json':148 'base':8,26,96,126,139 'call':4,22,165 'categori':49 'challeng':119 'classif':64 'collect':40 'connect':182 'convers':81 'cover':10,28 'data':50,54 'describ':109 'descript':200 'detail':189 'doc':172 'document':167 'e.g':216 'embed':65 'enabl':44 'endpoint':46,84,104,141,212,220 'estim':75 'exampl':197 'exchang':70 'export':55 'extrem':169 'feed':69 'financ':13,31,66 'four':48 'function':233 'gas':74 'gate':160 'generat':82 'geocod':79 'http':143 'http-post' 'infrastructur':77 'insight':56 'json-response' 'key':152 'learn':59 'limit':155 'list':105,208 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':58 'made':134 'match':226 'maxamountrequir':122 'metric':52 'micropay':166 'micropayment API' 'name':211 'network':97 'offer':38 'openapi':193 'page':177 'paid':91 'path':215,222 'pay':2,20 'pay-per-cal':1,19 'pay-per-call' 'pay-per-request' 'payment':132 'per':3,21,89,164 'per-cal':163 'post':144 'premium':111 'premium API access' 'price':68,86,174 'prompt':184 'protocol':101 'pure':161 'quot':73 'rate':71,154 'readm':176 'render':179 'report':53 'request':90,145 'request/response':196 'respons':149 'return':115,147,205 'schema':194 'sentiment':60 'site':207 'span':47 'spars':170 'specif':103,232 'suit':6,24 'summar':63 'technic':188 'text':62 'token':72 'unclear':235 'unit':127 'usd':131 'usdc':9,27,93,129 'usdc-base' 'util':15,33,78 'valid':80,117 'version':214 'via':98 'wallet':183 'web3':67 'x402':43,100,118 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"364ab7ad-c35a-45ca-b84b-201306c0c12e","listingId":"f953fbf7-38e5-49d7-9988-29a6e04071bb","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/endpoint-1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:18.561Z"}],"sources":[{"listingId":"f953fbf7-38e5-49d7-9988-29a6e04071bb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-1","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:18.561Z","lastSeenAt":"2026-04-23T20:01:31.072Z"}],"details":{"listingId":"f953fbf7-38e5-49d7-9988-29a6e04071bb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-1 \\\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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/endpoint-1"},{"claim":"Site lists 16 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to analytics, AI inference, finance data, or utility services via micropayment","Agent-driven workflows that need keyless, per-call API access settled in USDC on Base","Testing x402 payment flows against a low-cost endpoint"],"bestFor":["Developers exploring x402 micropayment-gated APIs","AI agents that can settle USDC payments on Base per request","Users who want no-signup, no-API-key access to utility endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who prefer subscription or bulk pricing over per-call payments","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T18:15:25.271Z"},"updatedAt":"2026-04-23T20:01:31.072Z"}}