{"id":"735c45c4-5f2d-4aea-8b3f-6ae88f6cc692","shortId":"LkN5s4","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network. The x402 protocol means there are no API keys, no sign-ups, and no rate limits — callers simply attach an X-PAYMENT header with a valid payment proof to each request.\n\nThe specific endpoint at `/api/v1/accounts/84` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is settled on-chain to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout window.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation beyond the landing page is extremely thin (docs, pricing, and API pages all render only a \"Connect wallet\" prompt), so the actual request/response schemas for this and other endpoints are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment required"],"warnings":["No OpenAPI or request/response schema available — callers cannot determine what to POST or what the response looks like.","Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no usable content.","The specific purpose of /api/v1/accounts/84 ('Premium API Access') is ambiguous and not documented.","Cannot verify what data or service this endpoint actually returns."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/84","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/84","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), but there is no OpenAPI schema, no documentation of request/response formats, and the docs/pricing/API pages are all empty beyond a wallet-connect prompt. The purpose of the specific /api/v1/accounts/84 endpoint is unclear beyond the generic label \"Premium API 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'/request':13,30 '0.02':12,29,62,139,191 '000':128 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':154 '0x8335':133 '20':127 '2913':134 '300':157 '402 payment required' '6':143 'accept':117 'access':115 'actual':217 'address':153 'advertis':123,164 'ai/ml':52 'analysi':168 'analyt':51 'api':5,15,22,32,41,79,114,206 'attach':91 'base':8,25,70,129,136 'base network api' 'beyond':196 'broader':162 'call':4,21 'caller':89 'chain':151 'challeng':122 'classif':171 'connect':212 'convers':183 'cost':61 'data':50,55,185 'decim':144 'doc':203 'document':195 'embed':172 'enabl':40 'endpoint':48,60,107,165,224 'equal':138 'estim':180 'everi':59 'exchang':175 'extrem':201 'feed':174 'finance/web3':54 'gas':179 'generat':186 'geocod':181 'given':140 'header':96 'howev':194 'infer':53 'json-response' 'key':16,33,80 'land':198 'limit':88 'list':111 'low payment fee' 'lowpaymentfee.com':35 'maxamountrequir':125 'mean':75 'micropayment api' 'network':71 'no-api-key' 'offer':44 'on-chain':149 'page':199,207 'paid':65 'pay':2,19 'pay per call api' 'pay-per-cal':1,18 'pay-per-request' 'payment':95,100,146 'per':3,20,63 'platform':6,23,42,163 'point':193 'post':118 'post-endpoint' 'premium':113 'price':173,192,204 'prompt':214 'proof':101 'protocol':74 'quot':178 'rate':87,176 'render':209 'request':64,104,119 'request/response':218 'requir':17,34 'schema':219 'second':158 'sentiment':167 'servic':58 'settl':148 'sign':83 'sign-up':82 'simpli':90 'span':49 'specif':106 'summar':170 'text':169 'thin':202 'timeout':159 'token':177 'unit':130 'unknown':226 'up':84 'usdc':9,26,67,132,141 'usdc api' 'usdc-base' 'util':57 'valid':99,182 'varieti':46 'via':10,27 'wallet':213 'window':160 'x':94 'x-payment':93 'x402':11,28,39,73,121 'x402 api' 'x402-enabled':38 'x402-payment'","prices":[{"id":"f2213bb1-059e-471a-aa07-86288ffbe08b","listingId":"735c45c4-5f2d-4aea-8b3f-6ae88f6cc692","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/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:40:12.157Z"}],"sources":[{"listingId":"735c45c4-5f2d-4aea-8b3f-6ae88f6cc692","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/84","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:12.157Z","lastSeenAt":"2026-04-24T20:02:18.654Z"}],"details":{"listingId":"735c45c4-5f2d-4aea-8b3f-6ae88f6cc692","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/84 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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/accounts/84"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/84"},{"claim":"All endpoints 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":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without creating an account or managing API keys","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Programmatic access to analytics, AI inference, or financial data with per-request billing"],"bestFor":["Developers or agents who want zero-signup, pay-as-you-go API access","x402-compatible clients that can construct USDC payment proofs on Base","Low-volume or bursty workloads where per-call pricing is more economical than subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume production workloads where $0.02/request adds up significantly","Callers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:36.756Z"},"updatedAt":"2026-04-24T20:02:18.654Z"}}