{"id":"5ab6cc5d-cd68-4eda-b9e4-b3ef73f1a15a","shortId":"7FLRv4","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API marketplace that exposes a broad set 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/28` is labeled \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made via the x402 exact scheme with no API keys or rate limits required. The endpoint accepts HTTP POST requests and returns `application/json` responses. The payment address is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` and the timeout is 300 seconds.\n\nDocumentation beyond the landing page is sparse — the /api, /pricing, and /README routes all resolve to a wallet-connect prompt with no additional content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the `/messages/28` endpoint actually returns. The site advertises many endpoints but the specific functionality of this particular route (messages/28) is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","json-api","no-api-key","http-post"],"categories":["api-marketplace","infrastructure"],"synonyms":["x402 API","pay per request API","USDC API","Base network API","micropayment API","lowpaymentfee","low payment fee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific purpose of /api/v1/messages/28 ('Premium API Access') is not documented — unclear what it returns","All secondary pages (/api, /pricing, /README) resolve to a wallet-connect prompt with no useful content","No request body schema or response examples are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/28","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/28","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, confirming pricing and payment details. However, there is no OpenAPI spec, no request/response schema, no documentation for the /messages/28 endpoint specifically, and the crawled pages beyond the landing page are empty wallet-connect prompts. The actual functionality of this specific endpoint is 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'/api/v1/messages/28':112 '/messages/28':218 '/pricing':187 '/readme':189 '/request':19,38 '0.02':18,37,94,132 '000':127 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':171 '20':126 '300':176 '402':121 '6':137 'Base network API' 'USDC API' 'accept':159 'access':117 'across':54 'actual':220 'addit':201 'address':169 'advertis':224 'ai':12,31,63 'analysi':67 'analyt':58 'api':5,24,45,116,151 'application/json':165 'avail':239 'base':8,27,102,128,140 'beyond':179 'broad':50 'call':4,23 'categori':56 'challeng':122 'classif':70 'connect':197 'content':202 'convers':87 'cover':10,29 'data':11,30,57 'decim':138 'document':178,211 'embed':71 'enabl':44 'endpoint':16,35,53,90,110,158,219,226 'estim':81 'exact':147 'exampl':214 'exchang':76 'export':61 'expos':48 'feed':75 'financ':13,32,72 'four':55 'function':230 'gas':80 'generat':88 'geocod':85 'http':160 'http-post' 'infrastructur':83 'insight':62 'json-api' 'key':152 'label':114 'land':181 'learn':65 'limit':155 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':64 'made':143 'mani':225 'marketplac':46 'materi':240 'messages/28':235 'metric':59 'micropayment API' 'network':103 'no-api-key' 'openapi':206 'page':182 'particular':233 'pay':2,21 'pay per request API' 'pay-per-cal':1,20 'pay-per-call' 'payment':141,168 'per':3,22,95 'platform':6,25 'post':161 'premium':115 'price':74,92 'prompt':198 'protocol':107 'quot':79 'rate':77,154 'report':60 'request':96,123,162 'request/response':209 'requir':156 'resolv':192 'respons':166 'return':119,164,221 'rout':190,234 'schema':210 'scheme':148 'second':177 'sentiment':66 'set':51 'settl':97 'sinc':134 'site':223 'spars':184 'spec':207 'specif':109,229 'summar':69 'text':68 'timeout':174 'token':78 'unclear':237 'unit':129 'usd':133 'usdc':9,28,99,131,135 'usdc-base' 'use':136 'util':15,34,84 'valid':86 'via':104,144 'wallet':196 'wallet-connect':195 'web3':73 'x402':43,106,146 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"c20db1b8-a505-442c-b4ea-4c7ab6a5ebcd","listingId":"5ab6cc5d-cd68-4eda-b9e4-b3ef73f1a15a","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/28","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.550Z"}],"sources":[{"listingId":"5ab6cc5d-cd68-4eda-b9e4-b3ef73f1a15a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/28","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.550Z","lastSeenAt":"2026-04-22T02:32:07.196Z"}],"details":{"listingId":"5ab6cc5d-cd68-4eda-b9e4-b3ef73f1a15a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/28 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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/28 requires up to 20,000 base units of USDC (USD Coin) on Base with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/messages/28"},{"claim":"The site offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without subscription or API key management","Agent-driven pay-per-call workflows settled in USDC on Base","Programmatic access to data, AI, finance, or utility endpoints with micropayments"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost per-request pricing without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.781Z"},"updatedAt":"2026-04-22T02:32:07.196Z"}}