{"id":"3cda080f-6512-4b0a-91bc-4a9d2fbfc156","shortId":"S7nmCC","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 platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/messages/33` 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, no subscriptions, no rate limits. Callers attach an `X-PAYMENT` header with a signed payment to access the resource.\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 listed endpoints share the same $0.02/request pricing.\n\nThe specific functionality behind `/api/v1/messages/33` is not documented beyond the label \"Premium API Access.\" There is no OpenAPI schema, no request/response examples, and the crawled docs pages (pricing, README, API) returned only a \"Connect wallet\" prompt with no additional content. The endpoint is confirmed live — it returns a well-formed 402 challenge — but what it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","payments"],"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 this endpoint","The specific functionality of /api/v1/messages/33 ('Premium API Access') is undocumented — it is unclear what data or service it provides","Docs, pricing, and README pages returned only 'Connect wallet' with no substantive content","No request body schema or response schema is available; callers cannot know what to send or expect back"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/33","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/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind '/api/v1/messages/33' is completely opaque. The crawled pages beyond the homepage returned no useful 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'/request':19,38,169 '0.02':18,37,80,168 '000':84 '20':83 '402':222 '402 payment api' '6':90 'access':75,119,184 'actual':227 'addit':209 'advertis':125 'ai':12,31,136 'analysi':140 'analyt':130 'api':5,24,45,74,100,183,200 'attach':108 'base':8,27,63,85 'base network api' 'base-network' 'behind':174 'beyond':179 'broad':50 'call':4,23,82 'caller':107 'catalog':51 'categori':128 'challeng':223 'classif':143 'confirm':214 'connect':204 'content':210 'convers':160 'cost':77 'cover':10,29 'crawl':195 'data':11,30,129,133 'decim':91 'doc':196 'document':178 'embed':144 'enabl':44 'endpoint':16,35,57,67,127,164,212 'estim':154 'exampl':192 'exchang':149 'export':134 'feed':148 'financ':13,32,145 'form':221 'four':126 'function':173 'gas':153 'generat':161 'geocod':158 'handl':94 'header':113 'infrastructur':156 'insight':135 'json-response' 'key':101 'label':181 'learn':138 'limit':106 'list':71,163 'live':215 'low payment fee' 'lowpaymentfee.com':39 'machin':137 'metric':131 'micropayment api' 'network':64 'no-api-key' 'offer':48 'openapi':188 'page':197 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':92,112,117,231 'per':3,22,55,81 'platform':6,25,46,124 'post-method' 'premium':73,182 'price':147,170,198 'prompt':206 'protocol':98 'quot':152 'rate':105,150 'readm':199 'report':132 'request':56 'request/response':191 'resourc':121 'return':201,217,228 'schema':189 'sentiment':139 'settl':58 'share':165 'sign':116 'specif':66,172 'subscript':103 'success':230 'summar':142 'text':141 'token':151 'unit':86 'unknown':233 'upon':229 'usdc':9,28,60,88 'usdc api' 'usdc-settlement' 'util':15,34,157 'valid':159 'via':95 'wallet':205 'web3':146 'well':220 'well-form':219 'wider':123 'x':111 'x-payment':110 'x402':43,97 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"83234e09-7c9a-48c8-8f0e-3929b28b2259","listingId":"3cda080f-6512-4b0a-91bc-4a9d2fbfc156","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/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.580Z"}],"sources":[{"listingId":"3cda080f-6512-4b0a-91bc-4a9d2fbfc156","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/33","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.580Z","lastSeenAt":"2026-04-22T02:32:07.265Z"}],"details":{"listingId":"3cda080f-6512-4b0a-91bc-4a9d2fbfc156","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/33 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/33"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","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"}],"useCases":["Programmatic access to a premium API resource via x402 micropayment on Base","Agent-driven pay-per-call workflows without pre-registration or API keys","Integrating USDC-settled API calls into Web3 applications"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or schemas before integrating","Anyone requiring fiat-only payment rails with no crypto involvement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.781Z"},"updatedAt":"2026-04-22T02:32:07.265Z"}}