{"id":"420be3af-05a9-43e7-907b-01cf7d13c60f","shortId":"RmSZgC","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/accounts/12` is listed as \"Premium API Access\" and returns `application/json` via POST.\n\nThe x402 challenge for this endpoint advertises a maxAmountRequired of 20,000 base units of USDC (contract `0x8335…2913` on Base). Since USDC uses 6 decimals, this equals $0.02 per call, consistent with the site's advertised flat pricing. Payment is made by including an `X-PAYMENT` header conforming to x402 version 1, with the \"exact\" scheme and a 300-second timeout.\n\nThe broader platform also advertises AI endpoints (sentiment analysis, text summarization, classification, embeddings), finance endpoints (price feeds, exchange rates, token quotes, gas estimates), data endpoints (metrics, reports, export, insights), and utility endpoints (geocoding, validation, conversion, generation) — all at the same $0.02/request price point. Documentation pages exist but were largely empty at crawl time (showing only a \"Connect wallet\" prompt), so detailed request/response schemas for individual endpoints are not available.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","premium-api-access","no-api-key","no-rate-limit"],"categories":["api-platform","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) returned no meaningful content — only a 'Connect wallet' prompt.","No OpenAPI or schema available; request body format and response structure for /api/v1/accounts/12 are unknown.","The purpose and data returned by the 'accounts/12' endpoint is unclear from available material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/12","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/accounts/12","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 captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and documentation pages are empty stubs. The specific purpose of '/api/v1/accounts/12' beyond 'Premium API Access' is 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'/request':13,28,200 '0.02':12,27,59,124,199 '000':107 '0x8335':113 '1':149 '20':106 '2913':114 '300':156 '402 payment api' '6':120 'access':90 'advertis':102,132,163 'ai':164 'ai/ml':49 'also':162 'analysi':167 'analyt':48 'api':5,20,37,71,89 'application/json':93 'avail':228 'base':8,23,67,108,116 'base network api' 'broad':42 'broader':160 'call':4,19,126 'catalog':43 'challeng':98 'classif':170 'commit':79 'conform':145 'connect':216 'consist':127 'contract':112 'convers':193 'cost':58 'crawl':211 'data':47,52,182 'decim':121 'detail':220 'document':203 'embed':171 'empti':209 'enabl':36 'endpoint':45,57,82,101,165,173,183,190,225 'equal':123 'estim':181 'everi':56 'exact':152 'exchang':176 'exist':205 'export':186 'feed':175 'financ':172 'finance/web3':51 'flat':133 'gas':180 'generat':194 'geocod':191 'header':144 'includ':139 'individu':224 'infer':50 'infrastructur':54 'insight':187 'json-api' 'key':72 'larg':208 'limit':75 'list':86 'low payment fee' 'lowpaymentfee.com':31 'made':137 'maxamountrequir':104 'metric':184 'micropayment api' 'network':9,24,68 'no-api-key' 'no-rate-limit' 'offer':40 'page':204 'paid':62 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':135,143 'per':3,18,60,125 'platform':6,21,38,161 'point':202 'post':95 'premium':88 'premium-api-access' 'price':134,174,201 'prompt':218 'quot':179 'rate':74,177 'report':185 'request':61 'request/response':221 'return':92 'schema':222 'scheme':153 'second':157 'sentiment':166 'show':213 'sinc':117 'site':130 'span':46 'specif':81 'summar':169 'text':168 'time':212 'timeout':158 'token':178 'unit':109 'upfront':78 'usdc':15,30,64,111,118 'usdc api' 'usdc-base' 'use':119 'util':55,189 'valid':192 'version':148 'via':10,25,94 'wallet':217 'x':142 'x-payment':141 'x402':11,26,35,97,147 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"5b2153d5-2f36-4417-bb49-5e9d66427a50","listingId":"420be3af-05a9-43e7-907b-01cf7d13c60f","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/accounts/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:39:15.403Z"}],"sources":[{"listingId":"420be3af-05a9-43e7-907b-01cf7d13c60f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/12","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:15.403Z","lastSeenAt":"2026-04-24T20:02:14.601Z"}],"details":{"listingId":"420be3af-05a9-43e7-907b-01cf7d13c60f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/12 \\\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":"Flat pricing of $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with exact scheme and 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/accounts/12"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium account data via a single paid HTTP POST call","Agent-driven workflows that need frictionless per-call payment without API key management","Programmatic access to paid endpoints settled on Base L2 in USDC"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Low-volume or bursty workloads where flat $0.02/call pricing is economical"],"notFor":["High-volume use cases where per-call costs add up quickly without bulk discounts","Users who need detailed API documentation or OpenAPI schemas before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:39.433Z"},"updatedAt":"2026-04-24T20:02:14.601Z"}}