{"id":"7f028738-8486-43d4-a914-133ad7b96eab","shortId":"yxb9Jr","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 provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/messages/133` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or rate limits are required; callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe wider platform advertises four endpoint 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 listed at the same $0.02/request price point.\n\nThe specific functionality behind `/api/v1/messages/133` is not documented beyond the label \"Premium API Access.\" There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled pages. The site's documentation, pricing, and README pages all resolve to a minimal \"Connect wallet\" prompt with no additional content. Prospective users should be aware that the actual behavior of this endpoint is unclear from available documentation.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","low payment fee"],"warnings":["No OpenAPI spec or request/response schema available for this endpoint","The actual functionality behind /api/v1/messages/133 ('Premium API Access') is undocumented","Documentation, pricing, and README pages on the site contain no useful content beyond 'Connect wallet'","Cannot verify what data or service this specific endpoint returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/133","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/133","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality of /api/v1/messages/133 is completely opaque. The site's doc pages are empty beyond a wallet-connect 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'/request':19,38,169 '0.02':18,37,80,168 '000':84 '20':83 '6':90 'Base network API' 'USDC API' 'access':75,185 'account':102 'actual':230 'addit':221 'advertis':124 'ai':12,31,135 'analysi':139 'analyt':129 'api':5,24,45,74,100,184 'attach':110 'avail':198,238 'awar':227 'base':8,27,63,85 'base-network' 'behavior':231 'behind':175 'beyond':180 'broad':50 'call':4,23,82 'caller':108 'catalog':51 'categori':127 'classif':142 'connect':216 'content':222 'convers':159 'cost':77 'crawl':201 'data':11,30,128,132 'decim':91 'document':179,206,239 'embed':143 'enabl':44 'endpoint':16,35,57,67,126,162,234 'estim':153 'exampl':197 'exchang':148 'export':133 'feed':147 'financ':13,32,144 'four':125 'function':174 'gas':152 'generat':160 'geocod':157 'handl':94 'header':115 'http-post' 'infrastructur':155 'insight':134 'key':101 'label':182 'learn':137 'limit':105 'list':71,164 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':136 'metric':130 'micropayment API' 'minim':215 'network':64 'no-api-key' 'offer':10,29 'openapi':189 'page':202,210 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':92,114,119 'per':3,22,55,81 'platform':6,25,46,123 'point':171 'premium':73,183 'price':146,170,207 'prompt':218 'proof':120 'prospect':223 'protocol':98 'provid':48 'quot':151 'rate':104,149 'readm':209 'report':131 'request':56 'request/response':192 'requir':107 'resolv':212 'schema':193 'sentiment':138 'settl':58 'simpli':109 'site':204 'spec':190 'specif':66,173 'summar':141 'text':140 'token':150 'unclear':236 'unit':86 'usag':196 'usdc':9,28,60,88 'usdc-settlement' 'user':224 'util':15,34,156 'valid':118,158 'via':95 'wallet':217 'web3':145 'wider':122 'x':113 'x-payment':112 'x402':43,97 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"ba6b871a-f11b-4aae-9fb6-b7a9144a6b55","listingId":"7f028738-8486-43d4-a914-133ad7b96eab","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/133","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.359Z"}],"sources":[{"listingId":"7f028738-8486-43d4-a914-133ad7b96eab","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/133","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.359Z","lastSeenAt":"2026-04-22T02:32:06.851Z"}],"details":{"listingId":"7f028738-8486-43d4-a914-133ad7b96eab","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/133 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/133"},{"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 platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/133"}],"useCases":["Accessing premium API content with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to data, AI, finance, or utility services"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring free or fiat-only payment methods","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.202Z"},"updatedAt":"2026-04-22T02:32:06.851Z"}}