{"id":"eb3c0340-338b-44f1-80a0-4708bfca98e4","shortId":"LfjE9h","kind":"x402","title":"Pay-per-call API platform on Base offering data, AI, finance, and utility endpoints at $0.02 each via x402.","tagline":"Pay-per-call API platform on Base offering data, AI, finance, and utility endpoints at $0.02 each via x402.","description":"lowpaymentfee.com is an x402-enabled API platform that exposes a broad set 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 with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint listed here (`/api/internal/users`) is described in the x402 challenge as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme, settling to the provider's wallet on Base. The challenge specifies a 300-second timeout and returns application/json.\n\nNote that while the landing page documents 16 public-facing API endpoints across the four categories above, this particular `/api/internal/users` path is not listed among them. It may be an internal or administrative endpoint. Documentation beyond the landing page is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","sentiment-analysis","text-summarization","text-classification","embeddings","data-analytics","price-feeds","exchange-rates","gas-estimates","geocoding","data-export"],"categories":["llm","finance","geo","data"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","low fee API","crypto-paid API"],"warnings":["The endpoint /api/internal/users is not listed among the provider's publicly documented APIs — it may be internal or undocumented.","All documentation pages (docs, API, pricing, README) return only a 'Connect wallet' prompt with no substantive content.","No OpenAPI spec, request schema, or response schema is available for this endpoint.","No examples of request or response payloads could be found."],"endpointUrl":"https://lowpaymentfee.com/api/internal/users","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/internal/users","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/request in USDC on Base). However, this specific endpoint (/api/internal/users) is not documented on the landing page, there is no OpenAPI spec, no request/response schema, and all documentation pages render only 'Connect wallet' with no content. The endpoint's actual functionality is 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'0.02':17,37,97,156 '000':146 '0x8335':151 '16':195 '20':145 '300':182 '6':160 'Base network API' 'USDC API' 'accept':135 'access':133 'across':56,201 'addit':247 'administr':221 'advertis':141 'ai':11,31,66 'among':213 'analysi':70 'analyt':60 'api':5,25,47,109,132,199,233 'application/json':187 'avail':262 'base':8,28,105,147,153,177 'beyond':224 'broad':52 'call':4,24 'categori':58,204 'challeng':129,140,179 'classif':73 'commit':117 'connect':242 'content':248 'convers':90 'crypto-paid API' 'data':10,30,59,63 'data-analytics' 'data-export' 'decim':161 'describ':125 'doc':232 'document':194,223,257 'embed':74 'embeddings' 'enabl':46 'endpoint':15,35,55,93,120,200,222 'equal':155 'estim':84 'exact':168 'exampl':261 'exchang':79 'exchange-rates' 'export':64 'expos':50 'extrem':229 'face':198 'feed':78 'financ':12,32,75 'four':57,203 'gas':83 'gas-estimates' 'generat':91 'geocod':88 'geocoding' 'given':157 'infrastructur':86 'insight':65 'intern':219 'key':110 'land':192,226 'learn':68 'limit':113 'list':121,212 'low fee API' 'lowpaymentfee.com':41 'machin':67 'made':164 'maxamountrequir':143 'may':216 'metric':61 'micropayment API' 'minimum':116 'network':106 'note':188 'offer':9,29 'openapi':252 'page':193,227,237 'paid':100 'particular':207 'path':209 'pay':2,22 'pay-per-cal':1,21 'pay-per-call API' 'pay-per-request' 'payment':162 'per':3,23,98 'platform':6,26,48 'post':136 'premium':131 'price':77,95,234 'price-feeds' 'prompt':244 'provid':173 'public':197 'public-fac':196 'quot':82 'rate':80,112 'readm':236 'render':239 'report':62 'request':99,137 'request/response':255 'return':186 'schema':256 'scheme':169 'second':183 'sentiment':69 'sentiment-analysis' 'set':53 'settl':170 'spars':230 'spec':253 'specif':119 'specifi':180 'summar':72 'text':71 'text-classification' 'text-summarization' 'timeout':184 'token':81 'unit':148 'usag':260 'usdc':102,150,158 'usdc-base' 'util':14,34,87 'valid':89 'via':19,39,165 'wallet':175,243 'web3':76 'x402':20,40,45,128,139,167 'x402 API' 'x402-enabled':44 'x402-payment'","prices":[{"id":"17150332-ffb0-486b-a336-2e50c42c2ec5","listingId":"eb3c0340-338b-44f1-80a0-4708bfca98e4","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/internal/users","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:55.347Z"}],"sources":[{"listingId":"eb3c0340-338b-44f1-80a0-4708bfca98e4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/internal/users","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:55.347Z","lastSeenAt":"2026-04-23T14:30:36.845Z"}],"details":{"listingId":"eb3c0340-338b-44f1-80a0-4708bfca98e4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/internal/users \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","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, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"16 endpoints listed across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","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/internal/users"},{"claim":"Payment settles to wallet 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeout","source_url":"https://lowpaymentfee.com/api/internal/users"}],"useCases":["Agent-driven data retrieval with per-call USDC micropayments","On-demand AI inference (sentiment, summarization, classification) without API key management","Fetching real-time crypto gas estimates and token quotes programmatically","Geocoding and data validation as utility microservices"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments on Base","Projects needing low-cost micropayment-gated endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-throughput production workloads requiring SLA guarantees","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.501Z"},"updatedAt":"2026-04-23T14:30:36.845Z"}}