{"id":"082324df-94fe-40e6-8418-7b77335fefa5","shortId":"wZMfZ2","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 utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/accounts/102` is listed as \"Premium API Access\" and returns `application/json` via POST. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises additional endpoint categories including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 per call. However, documentation beyond the landing page is extremely sparse (docs, pricing, and README 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","json-api","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":["No request or response schema available — the actual functionality of /api/v1/accounts/102 is undocumented","All documentation pages (docs, pricing, README, api) render only 'Connect wallet' with no useful content","The purpose of the 'accounts/102' endpoint is unclear — it may be a demo or placeholder"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/102","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/102","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 documentation of request parameters, response schema, or what 'Premium API Access' at /api/v1/accounts/102 actually returns. Docs pages are empty beyond a wallet-connect 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'/request':13,28 '0.02':12,27,64,128,177 '000':116 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':140 '0x8335':122 '20':115 '2913':123 '300':143 '402 payment api' '6':132 'access':102 'account':76 'actual':203 'addit':150 'address':139 'advertis':111,149 'ai/ml':49 'analysi':155 'analyt':48 'api':5,20,37,74,101 'application/json':105 'asset':121 'attach':84 'base':8,23,71,117,125 'base network api' 'beyond':182 'broad':42 'broader':147 'call':4,19,179 'caller':82 'catalog':43 'categori':152 'challeng':110 'classif':158 'connect':198 'convers':170 'data':47,52 'decim':133 'doc':189 'document':181 'embed':159 'enabl':36 'endpoint':45,57,94,151,210 'equal':127 'estim':167 'exchang':162 'extrem':187 'feed':161 'finance/web3':51 'gas':166 'generat':172 'geocod':168 'given':129 'header':88 'howev':180 'includ':153 'infer':50 'json-api' 'key':75 'land':184 'limit':79 'list':98 'low payment fee' 'lowpaymentfee.com':31 'maxamountrequir':113 'micropayment api' 'network':9,24,72 'no-api-key' 'no-rate-limit' 'offer':40 'page':185,193 'pay':2,17,60 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':59 'payment':87,135 'per':3,18,61,178 'platform':6,21,38,148 'post':107 'premium':100 'price':160,190 'prompt':200 'quot':165 'rate':78,163 'readm':192 'render':195 'request':62,91 'request/response':204 'requir':81 'return':104 'schema':205 'second':144 'sent':137 'sentiment':154 'servic':55 'settl':66 'simpli':83 'span':46 'spars':188 'specif':93 'summar':157 'text':156 'timeout':145 'token':164 'unit':118 'unknown':212 'usdc':15,30,68,120,130 'usdc api' 'usdc-base' 'util':54 'valid':169 'via':10,25,106 'wallet':199 'x402':11,26,35,86,109 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"c3e1ca95-14d1-40ac-9ac9-533d5501d56b","listingId":"082324df-94fe-40e6-8418-7b77335fefa5","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/102","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:40:38.280Z"}],"sources":[{"listingId":"082324df-94fe-40e6-8418-7b77335fefa5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/102","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:38.280Z","lastSeenAt":"2026-04-24T18:32:14.296Z"}],"details":{"listingId":"082324df-94fe-40e6-8418-7b77335fefa5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/102 \\\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":"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":"x402 challenge shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/accounts/102"},{"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","Making one-off paid API calls from autonomous agents using x402 protocol","Programmatic access to various utility and data endpoints with crypto micropayments"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation and response schemas before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:35.52Z"},"updatedAt":"2026-04-24T18:32:14.296Z"}}