{"id":"bd229438-a272-491c-9ecf-df6139a53c8a","shortId":"msbvzb","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 exposes a broad catalog 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, payable in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint `/api/v1/messages/71` is listed as \"Premium API Access\" and returns a valid x402 402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is made via the x402 exact scheme to the payTo address. The endpoint accepts HTTP POST requests and returns application/json.\n\nDocumentation is minimal — the landing page lists available endpoints and pricing but provides no request/response schemas, parameter descriptions, or usage examples. The /api, /pricing, and /README pages all resolve to a \"Connect wallet\" prompt with no additional content. Without concrete documentation on what `/api/v1/messages/71` actually returns or what input it expects, the endpoint's specific functionality remains unclear beyond its generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","http-post","json-response","data-analytics","ai-inference","finance-data","web3-data","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","serverless api","no-auth api"],"warnings":["No API documentation, request schemas, or response examples available for any endpoint","The specific function of /api/v1/messages/71 ('Premium API Access') is not described anywhere","The /pricing, /api, and /README pages all return only a 'Connect wallet' prompt with no content","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/71","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/messages/71","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response documentation, no examples, and the specific purpose of /api/v1/messages/71 is entirely unclear. The landing page lists many endpoints but provides no technical detail for any of 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'/api/v1/messages/71':122,219 '/pricing':199 '/readme':201 '/request':19,38 '0.02':18,37,95,154 '000':141 '0x8335':146 '20':140 '2913':147 '402':134 '6':150 'accept':169 'access':128,239 'across':54 'actual':220 'addit':212 'address':166 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,110,127,238 'application/json':175 'avail':183 'base':8,27,103,142,149 'base network api' 'beyond':234 'broad':50 'call':4,23 'catalog':51 'categori':56 'challeng':135 'classif':71 'commit':118 'concret':215 'connect':207 'content':213 'convers':88 'data':11,30,57,61 'data-analytics' 'decim':151 'descript':193 'document':176,216 'embed':72 'enabl':44 'endpoint':16,35,53,91,121,168,184,228 'equal':153 'estim':82 'exact':161 'exampl':196 'exchang':77 'expect':226 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'function':231 'gas':81 'generat':89 'generic':236 'geocod':86 'geocoding' 'http':170 'http-post' 'infrastructur':84 'input':224 'insight':63 'json-response' 'key':111 'label':240 'land':180 'learn':66 'limit':114 'list':124,182 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'made':157 'maxamountrequir':138 'metric':59 'micropayment api' 'minim':178 'network':104 'no-auth api' 'offer':10,29 'page':181,202 'paramet':192 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payabl':98 'payment':155 'payto':165 'per':3,22,96 'platform':6,25,46 'post':171 'premium':126,237 'price':75,93,186 'prompt':209 'protocol':108 'provid':188 'quot':80 'rate':78,113 'remain':232 'report':60 'request':97,172 'request/response':190 'resolv':204 'return':130,174,221 'schema':191 'scheme':162 'sentiment':67 'serverless api' 'specif':120,230 'summar':70 'text':69 'token':79 'unclear':233 'unit':143 'upfront':117 'usag':195 'usdc':9,28,100,145 'usdc api' 'usdc-base' 'util':15,34,85 'utility-services' 'valid':87,132 'via':105,158 'wallet':208 'web3':74 'web3-data' 'without':214 'x402':43,107,133,160 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"2f86366e-4266-48be-a9b9-f7c2f643a729","listingId":"bd229438-a272-491c-9ecf-df6139a53c8a","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/messages/71","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.106Z"}],"sources":[{"listingId":"bd229438-a272-491c-9ecf-df6139a53c8a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/71","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.106Z","lastSeenAt":"2026-04-22T02:32:08.173Z"}],"details":{"listingId":"bd229438-a272-491c-9ecf-df6139a53c8a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/71 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/messages/71","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/messages/71"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time crypto gas estimates or token quotes with per-call USDC micropayments","Geocoding or data validation as a utility service within automated workflows","Accessing analytics metrics or data exports on a pay-as-you-go basis"],"bestFor":["AI agents and bots that can settle x402 payments in USDC on Base","Developers wanting zero-signup, pay-per-use API access","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["High-volume production workloads needing SLAs or guaranteed uptime (no documentation on reliability)","Users who need detailed API documentation, request schemas, or response guarantees before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.953Z"},"updatedAt":"2026-04-22T02:32:08.173Z"}}