{"id":"7f565ef7-a970-4356-b3d8-e3a12c1a1990","shortId":"yqfX9t","kind":"x402","title":"Pay-per-call API platform on Base offering AI, analytics, finance, and utility endpoints via x402.","tagline":"Pay-per-call API platform on Base offering AI, analytics, finance, and utility endpoints via x402.","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 pay-per-request with no API keys, no rate limits, and no commitments required — payment is handled inline via the x402 protocol on the Base network using USDC.\n\nThe specific endpoint probed here (`/api/v2/admin`) is described as \"Premium API Access\" and costs up to $0.02 per request (20,000 base units of USDC with 6 decimals). The broader platform advertises a uniform $0.02/request pricing across all its endpoints. Available API categories include: 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).\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The x402 challenge is live and well-formed, confirming the endpoint accepts POST requests and settles payments in USDC on Base to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.","tags":[],"capabilities":["x402-payment","pay-per-request","sentiment-analysis","text-summarization","text-classification","embeddings","analytics","data-export","price-feeds","exchange-rates","gas-estimates","geocoding","validation","conversion","usdc-base"],"categories":["llm","finance","geo","analytics"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api","ai inference api","sentiment api","embeddings api"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema provided for any endpoint","The specific purpose of /api/v2/admin ('Premium API Access') is undefined — it is unclear what this endpoint actually does versus the other listed endpoints","No request or response examples available anywhere","Cannot verify that the advertised AI, analytics, finance, and utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v2/admin","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/v2/admin","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and accepts payments. However, there is no OpenAPI schema, no request/response examples, and all documentation pages return only a wallet-connect prompt. The purpose of the specific /api/v2/admin endpoint is unclear beyond 'Premium API Access'. Effectively a stub 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'/request':127 '0.02':108,126 '000':112 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':231 '20':111 '6':118 'accept':219 'access':103 'across':129 'address':230 'advertis':123 'ai':10,27,144 'ai inference api' 'ai/ml':52 'analysi':148 'analyt':11,28,51,138 'analytics' 'api':5,22,41,69,102,134,176 'avail':133 'base':8,25,88,113,228 'base network api' 'broader':121 'call':4,21 'categori':135 'challeng':209 'classif':151 'collect':46 'commit':76 'confirm':216 'connect':185 'content':191 'convers':168 'conversion' 'cost':105 'data':50,55,137,141 'data-export' 'decim':119 'describ':99 'detail':202 'doc':175 'document':170,203 'embed':152 'embeddings' 'embeddings api' 'enabl':40 'endpoint':15,32,48,61,94,132,206,218 'estim':162 'exampl':199 'exchang':157 'exchange-rates' 'export':142 'extrem':172 'feed':156 'financ':12,29,153 'finance/web3':54 'form':215 'gas':161 'gas-estimates' 'general':57 'generat':169 'geocod':166 'geocoding' 'handl':80 'includ':136 'infer':53 'infrastructur':164 'inlin':81 'insight':143 'key':70 'learn':146 'limit':73 'live':211 'low payment fee' 'lowpaymentfee.com':35 'machin':145 'metric':139 'micropayment api' 'network':89 'offer':9,26 'openapi':195 'page':180 'pay':2,19,64 'pay per call api' 'pay-per-cal':1,18 'pay-per-request':63 'payment':78,224 'per':3,20,65,109 'platform':6,23,42,122 'post':220 'premium':101 'price':128,155,177 'price-feeds' 'probe':95 'prompt':187 'protocol':85 'provid':44 'quot':160 'rate':72,158 'readm':179 'render':182 'report':140 'request':66,110,221 'request/response':198 'requir':77 'schema':196 'sentiment':147 'sentiment api' 'sentiment-analysis' 'servic':59 'settl':223 'span':49 'spars':173 'specif':93 'summar':150 'text':149 'text-classification' 'text-summarization' 'token':159 'uniform':125 'unit':114 'usdc':91,116,226 'usdc api' 'usdc-base' 'use':90 'util':14,31,58,165 'valid':167 'validation' 'via':16,33,82 'wallet':186 'web3':154 'well':214 'well-form':213 'x402':17,34,39,84,208 'x402 api' 'x402-enabled':38 'x402-payment'","prices":[{"id":"9e3ee97e-9390-421f-84cf-68b05cbf4e22","listingId":"7f565ef7-a970-4356-b3d8-e3a12c1a1990","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/v2/admin","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:53.960Z"}],"sources":[{"listingId":"7f565ef7-a970-4356-b3d8-e3a12c1a1990","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v2/admin","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:53.960Z","lastSeenAt":"2026-04-22T20:00:29.049Z"}],"details":{"listingId":"7f565ef7-a970-4356-b3d8-e3a12c1a1990","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v2/admin \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Uniform pricing of $0.02 per request across all endpoints","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units USDC on Base","source_url":"https://lowpaymentfee.com/api/v2/admin"},{"claim":"Available endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v2/admin"}],"useCases":["Running sentiment analysis or text summarization without managing API keys or subscriptions","Fetching real-time crypto gas estimates or token price quotes on a per-call basis","Geocoding addresses or validating data with instant pay-per-use access","Generating text embeddings for search or classification tasks","Exporting analytics data or retrieving metrics reports"],"bestFor":["Agents or bots that need keyless, pay-per-call API access","Developers wanting to prototype quickly without signup or rate limits","Web3-native applications already operating on Base with USDC"],"notFor":["High-volume production workloads where per-request costs add up (no bulk discounts documented)","Users who need detailed API documentation, schemas, or guaranteed SLAs","Anyone without access to USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:18:23.009Z"},"updatedAt":"2026-04-22T20:00:29.049Z"}}