{"id":"3ccfa7f1-d0c4-482b-bd46-042844903ea4","shortId":"pt2nAR","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/15` is listed under the title \"Premium API Access.\" 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. The endpoint accepts HTTP POST requests and returns application/json. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nNote that while the landing page lists many endpoints, the crawled /api, /pricing, and /README pages returned only a \"Connect wallet\" prompt with no additional documentation. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The exact purpose of the `/api/v1/messages/15` endpoint is unclear — the generic \"Premium API Access\" label does not describe what data or functionality it provides. Prospective callers should be aware that documentation is essentially absent beyond the homepage catalog.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The exact functionality of /api/v1/messages/15 ('Premium API Access') is undocumented and unclear","All secondary pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no content","No example responses or error formats are documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/15","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/15","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a homepage catalog, and the specific purpose of /api/v1/messages/15 is undefined. The /api, /pricing, and /README pages returned no useful 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'/api/v1/messages/15':122,223 '/pricing':187 '/readme':189 '/request':19,38 '0.02':18,37,95,149 '000':139 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':169 '0x8335':144 '20':138 '300':172 '402 payment api' '6':153 'absent':251 'accept':157 'access':130,231 'across':54 'addit':199 'address':168 'advertis':134 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,110,129,230 'application/json':163 'avail':214 'awar':246 'base':8,27,103,140,146 'base network api' 'beyond':252 'broad':50 'call':4,23 'caller':243 'catalog':51,255 'categori':56 'challeng':133 'classif':71 'classification' 'commit':118 'connect':194 'convers':88 'crawl':185,217 'crypto-quotes' 'data':11,30,57,61,237 'data-analytics' 'decim':154 'describ':235 'document':200,209,248 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,121,156,183,224 'equal':148 'essenti':250 'estim':82 'exact':219 'exampl':213 'exchang':77 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'function':239 'gas':81 'generat':89 'generic':228 'geocod':86 'geocoding' 'given':150 'homepag':254 'http':158 'infrastructur':84 'insight':63 'key':111 'label':232 'land':179 'learn':66 'limit':114 'list':124,181 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':65 'mani':182 'maxamountrequir':136 'metric':59 'micropayment api' 'network':104 'note':175 'offer':10,29 'openapi':204 'page':180,190 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payabl':98 'payment':164 'per':3,22,96 'platform':6,25,46 'post':159 'premium':128,229 'price':75,93 'prompt':196 'prospect':242 'protocol':108 'provid':241 'purpos':220 'quot':80 'rate':78,113 'report':60 'request':97,160 'request/response':207 'return':162,191 'schema':208 'second':173 'sent':166 'sentiment':67 'sentiment-analysis' 'spec':205 'specif':120 'summar':70 'text':69 'text-summarization' 'timeout':174 'titl':127 'token':79 'unclear':226 'unit':141 'upfront':117 'usag':212 'usdc':9,28,100,143,151 'usdc api' 'usdc-base' 'util':15,34,85 'utility-apis' 'valid':87 'via':105 'wallet':195 'web3':74 'x402':43,107,132 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"1215bdcd-a473-4166-aae8-de6c5d6f08d9","listingId":"3ccfa7f1-d0c4-482b-bd46-042844903ea4","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/15","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.163Z"}],"sources":[{"listingId":"3ccfa7f1-d0c4-482b-bd46-042844903ea4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/15","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.163Z","lastSeenAt":"2026-04-22T02:32:06.417Z"}],"details":{"listingId":"3ccfa7f1-d0c4-482b-bd46-042844903ea4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/15 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/messages/15","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 are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/messages/15 specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/15"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) on a per-call payment basis without API keys","Fetching real-time crypto quotes, gas estimates, and exchange rates via micropayments","Running geocoding, validation, or data conversion utilities with no subscription commitment","Exporting analytics data or generating reports with pay-as-you-go pricing"],"bestFor":["Agents or developers who want zero-signup, pay-per-call API access","Use cases requiring small, infrequent API calls where subscriptions are wasteful","Crypto-native workflows that can settle USDC on Base"],"notFor":["High-volume production workloads that need SLAs, rate-limit guarantees, or dedicated support","Users who need detailed API documentation, request/response schemas, or sandbox environments before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.455Z"},"updatedAt":"2026-04-22T02:32:06.417Z"}}