{"id":"d0954d66-ac45-49c3-b7ec-faca980dc258","shortId":"LmYPjL","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 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, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/messages/191` is listed as \"Premium API Access.\" Its x402 challenge advertises a maxAmountRequired of 20000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments required. The endpoint accepts HTTP POST requests and returns application/json.\n\nNote that while the landing page lists many endpoints, the specific functionality behind `/api/v1/messages/191` is not documented beyond the generic \"Premium API Access\" label. The crawled /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no additional documentation. There is no OpenAPI spec, no request/response schema, and no usage examples available, so the actual behavior of this particular endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","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"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific functionality of /api/v1/messages/191 is undocumented — 'Premium API Access' is the only description","All secondary pages (/api, /pricing, /README) returned only 'Connect wallet' with no content","No request body schema or response examples are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/191","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/191","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 for this specific endpoint, and the /api, /pricing, and /README pages are empty. The actual functionality behind /api/v1/messages/191 is unknown beyond the generic 'Premium API Access' 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'/api/v1/messages/191':112,185 '/pricing':199 '/readme':201 '/request':19,38 '0.02':18,37,95,137 '0x8335':131 '20000':126 '2913':132 '402 payment api' '6':141 'accept':165 'access':118,194 'across':54 'actual':229 'addit':212 'advertis':122 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,117,153,193 'application/json':171 'avail':226 'base':8,27,103,127,134 'base network api' 'behavior':230 'behind':184 'beyond':189 'broad':50 'call':4,23 'categori':56 'challeng':121 'classif':71 'classification' 'commit':161 'connect':207 'convers':88 'crawl':197 'data':11,30,57,61 'data-analytics' 'decim':142 'document':188,213 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,164,180,234 'equal':136 'estim':82 'exact':149 'exampl':225 'exchang':77 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'function':183 'gas':81 'generat':89 'generic':191 'geocod':86 'geocoding' 'given':138 'http':166 'infrastructur':84 'insight':63 'key':154 'label':195 'land':176 'learn':66 'limit':157 'list':114,178 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'made':145 'mani':179 'maxamountrequir':124 'metric':59 'micropayment api' 'network':104 'note':172 'offer':10,29 'openapi':217 'page':177,202 'particular':233 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':143 'per':3,22,96 'platform':6,25,46 'post':167 'premium':116,192 'price':75,93 'prompt':209 'protocol':108 'quot':80 'rate':78,156 'remain':235 'report':60 'request':97,168 'request/response':220 'requir':162 'return':170,204 'schema':221 'scheme':150 'sentiment':67 'sentiment-analysis' 'set':51 'settl':98 'spec':218 'specif':110,182 'summar':70 'text':69 'text-summarization' 'token':79 'unclear':236 'unit':128 'upfront':160 'usag':224 'usdc':9,28,100,130,139 'usdc api' 'usdc-base' 'util':15,34,85 'utility-apis' 'valid':87 'via':105,146 'wallet':208 'web3':74 'x402':43,107,120,148 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"50eb5cef-c6f1-4742-a737-51e89c90b443","listingId":"d0954d66-ac45-49c3-b7ec-faca980dc258","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/191","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.496Z"}],"sources":[{"listingId":"d0954d66-ac45-49c3-b7ec-faca980dc258","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/191","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.496Z","lastSeenAt":"2026-04-22T02:32:07.135Z"}],"details":{"listingId":"d0954d66-ac45-49c3-b7ec-faca980dc258","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/191 \\\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":"All endpoints priced at $0.02 per request with no minimums or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge shows maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/191"},{"claim":"Endpoint accepts POST method and returns application/json","source_url":"https://lowpaymentfee.com/api/v1/messages/191"}],"useCases":["Calling AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates on a per-request basis","Running utility operations like geocoding, validation, and data conversion with instant pay-per-use access","Agents autonomously purchasing API calls using USDC on Base without subscriptions"],"bestFor":["AI agents that need on-demand API access without pre-registration","Developers wanting zero-commitment, pay-as-you-go API access","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads needing bulk pricing or SLAs","Users who need detailed API documentation and request/response schemas before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.885Z"},"updatedAt":"2026-04-22T02:32:07.135Z"}}