{"id":"7753a05c-35ac-4520-bfd5-abaac051b691","shortId":"CXqy4C","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, 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 at `/api/v1/messages/120` is listed as \"Premium API Access.\" Its x402 challenge advertises a maxAmountRequired of 20,000 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 the `/api/v1/messages/120` endpoint does not clearly map to any of the four advertised categories on the landing page, and no documentation, OpenAPI schema, or usage examples are available. The crawled /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. The actual request/response format for this specific endpoint is unknown.","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":["llm","data","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /api/v1/messages/120 path does not correspond to any of the categories listed on the landing page — its actual functionality is unknown","The /api, /pricing, and /README pages returned no useful content (only 'Connect wallet')","No request body schema or response examples are available anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/120","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/120","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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation, no request/response examples, and the /api, /pricing, and /README pages are empty. The specific endpoint path (/api/v1/messages/120) doesn't match any documented category, making its purpose 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'/api/v1/messages/120':112,176 '/pricing':206 '/readme':208 '/request':19,38 '0.02':18,37,94,138 '000':127 '0x8335':132 '20':126 '2913':133 '6':142 'accept':166 'access':118 'across':54 'actual':222 'advertis':122,187 'ai':12,31,63 'ai-inference' 'analysi':67 'analyt':58 'api':5,24,45,117,154 'application/json':172 'avail':202 'base':8,27,102,128,135 'base network api' 'broad':50 'call':4,23 'catalog':51 'categori':56,188 'challeng':121 'classif':70 'classification' 'clear':180 'commit':162 'connect':214 'content':220 'convers':87 'crawl':204 'data':11,30,57 'data-analytics' 'decim':143 'document':195 'embed':71 'embeddings' 'enabl':44 'endpoint':16,35,53,90,110,165,177,228 'equal':137 'estim':81 'exact':150 'exampl':200 'exchang':76 'export':61 'expos':48 'feed':75 'financ':13,32,72 'finance-data' 'format':224 'four':55,186 'gas':80 'generat':88 'geocod':85 'geocoding' 'given':139 'http':167 'infrastructur':83 'insight':62 'key':155 'land':191 'learn':65 'limit':158 'list':114 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':64 'made':146 'map':181 'maxamountrequir':124 'metric':59 'micropayment api' 'network':103 'note':173 'offer':10,29 'openapi':196 'page':192,209 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':144 'per':3,22,95 'platform':6,25,46 'post':168 'premium':116 'price':74,92 'prompt':216 'protocol':107 'quot':79 'rate':77,157 'report':60 'request':96,169 'request/response':223 'requir':163 'return':171,211 'schema':197 'scheme':151 'sentiment':66 'sentiment-analysis' 'settl':97 'specif':109,227 'substant':219 'summar':69 'text':68 'text-summarization' 'token':78 'unit':129 'unknown':230 'upfront':161 'usag':199 'usdc':9,28,99,131,140 'usdc api' 'usdc-base' 'util':15,34,84 'utility-apis' 'valid':86 'via':104,147 'wallet':215 'web3':73 'x402':43,106,120,149 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"ace9468d-df31-47ad-b9b3-117dbbe9d2b0","listingId":"7753a05c-35ac-4520-bfd5-abaac051b691","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/120","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.622Z"}],"sources":[{"listingId":"7753a05c-35ac-4520-bfd5-abaac051b691","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/120","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.622Z","lastSeenAt":"2026-04-22T07:32:30.297Z"}],"details":{"listingId":"7753a05c-35ac-4520-bfd5-abaac051b691","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/120 \\\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 are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/messages/120 specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/120"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) on a per-call basis without API keys","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Running data analytics queries (metrics, reports, insights) with micropayment settlement","Geocoding, validation, and data conversion via utility endpoints"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments in USDC on Base","Projects needing low-cost micropayment-gated endpoints without subscription overhead"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","Applications requiring high-throughput bulk access with negotiated pricing","Users without USDC on Base or an x402-compatible payment client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:02.303Z"},"updatedAt":"2026-04-22T07:32:30.297Z"}}