{"id":"ae2d9fd1-740f-47a8-965b-c2fe21d4fa86","shortId":"ByxGgK","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The specific endpoint at `/api/v1/transactions/278` is listed as \"Premium API Access\" and returns `application/json` via POST.\n\nThe platform advertises four main categories of APIs: (1) Data & Analytics — metrics, reports, data export, and insights; (2) AI & Machine Learning — sentiment analysis, text summarization, classification, and embeddings; (3) Finance & Web3 — price feeds, exchange rates, token quotes, and gas estimates; (4) Infrastructure — geocoding, validation, conversion, and generation utilities. All endpoints follow the x402 payment protocol, where callers attach an `X-PAYMENT` header containing a signed USDC payment to unlock the response.\n\nNote that the specific endpoint probed (`/api/v1/transactions/278`) does not appear in the site's published API catalog, and its actual functionality beyond the generic \"Premium API Access\" label is unclear. Documentation pages (docs, pricing, README) all returned only a \"Connect wallet\" prompt with no substantive content. Without request/response schemas or detailed docs, the exact behavior of this endpoint cannot be confirmed.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-api","post-method","no-api-key","no-rate-limit"],"categories":["api-platform","finance","llm","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["The endpoint /api/v1/transactions/278 does not appear in the site's published API catalog — its actual functionality is unknown.","All documentation pages (/docs, /pricing, /README, /api) returned only 'Connect wallet' with no substantive content.","No OpenAPI spec, request schema, or response schema is available for this endpoint.","The purpose and data returned by 'Premium API Access' cannot be verified from available materials."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/278","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/transactions/278","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, this specific endpoint path (/api/v1/transactions/278) is not listed in the site's catalog, documentation pages are empty stubs, and there is no OpenAPI schema, request/response examples, or explanation of what 'Premium API Access' actually 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'/request':13,28 '0.02':12,27,59 '1':104 '2':113 '3':124 '4':136 '402 payment api' 'access':90,194 'actual':187 'advertis':98 'ai':114 'ai/ml':49 'analysi':118 'analyt':48,106 'api':5,20,37,71,89,103,183,193 'appear':177 'application/json':93 'attach':153 'base':8,23,67 'base network api' 'behavior':222 'beyond':189 'broad':42 'call':4,19 'caller':152 'cannot':226 'catalog':43,184 'categori':101 'classif':121 'commit':79 'confirm':228 'connect':207 'contain':159 'content':213 'convers':140 'cost':58 'data':47,52,105,109 'detail':218 'doc':200,219 'document':198 'embed':123 'enabl':36 'endpoint':45,57,82,145,172,225 'estim':135 'everi':56 'exact':221 'exchang':129 'export':110 'feed':128 'financ':125 'finance/web3':51 'follow':146 'four':99 'function':188 'gas':134 'generat':142 'generic':191 'geocod':138 'header':158 'infer':50 'infrastructur':54,137 'insight':112 'json-api' 'key':72 'label':195 'learn':116 'limit':75 'list':86 'low payment fee' 'lowpaymentfee.com':31 'machin':115 'main':100 'metric':107 'micropayment api' 'network':9,24,68 'no-api-key' 'no-rate-limit' 'note':168 'offer':40 'page':199 'paid':62 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':149,157,163 'per':3,18,60 'platform':6,21,38,97 'post':95 'post-method' 'premium':88,192 'price':127,201 'probe':173 'prompt':209 'protocol':150 'publish':182 'quot':132 'rate':74,130 'readm':202 'report':108 'request':61 'request/response':215 'respons':167 'return':92,204 'schema':216 'sentiment':117 'sign':161 'site':180 'span':46 'specif':81,171 'substant':212 'summar':120 'text':119 'token':131 'unclear':197 'unlock':165 'upfront':78 'usdc':15,30,64,162 'usdc api' 'usdc-base-network' 'util':55,143 'valid':139 'via':10,25,94 'wallet':208 'web3':126 'without':214 'x':156 'x-payment':155 'x402':11,26,35,148 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"fc727b17-14b3-45fc-a337-e716179e7f10","listingId":"ae2d9fd1-740f-47a8-965b-c2fe21d4fa86","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/transactions/278","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:54.570Z"}],"sources":[{"listingId":"ae2d9fd1-740f-47a8-965b-c2fe21d4fa86","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/278","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:54.570Z","lastSeenAt":"2026-04-22T20:01:39.188Z"}],"details":{"listingId":"ae2d9fd1-740f-47a8-965b-c2fe21d4fa86","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/278 \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints cost $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 APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network, equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/transactions/278"},{"claim":"Documentation pages returned only 'Connect wallet' with no substantive content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data without managing API keys or subscriptions","Making one-off paid API calls from autonomous agents using x402 USDC payments","Integrating pay-per-use analytics, AI inference, or financial data into applications"],"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 ($0.02) per-request API calls without signup"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume use cases where per-request pricing may add up compared to subscription plans","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.97Z"},"updatedAt":"2026-04-22T20:01:39.188Z"}}