{"id":"4b16b4cf-a6de-42db-aac2-2ffb700d96c8","shortId":"BZWD3b","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 variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are paid per-request using USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint at `/api/v1/accounts/24` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, which equals $0.02 per request (USDC uses 6 decimals). The endpoint accepts POST requests and returns application/json. Payment is made via the x402 exact scheme with a 300-second timeout.\n\nThe broader platform advertises additional endpoints 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/request price point. However, documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual functionality and response schemas of these endpoints remain unverified.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base-network","json-api","post-method","no-api-key","no-rate-limits"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","micropayment endpoint"],"warnings":["Documentation pages (/docs, /pricing, /README) contain no substantive content — only a 'Connect wallet' prompt.","The actual functionality of /api/v1/accounts/24 ('Premium API Access') is not described anywhere; the endpoint purpose is unknown.","No OpenAPI schema or response schema is available, so request/response formats are unverified.","No examples of successful responses are available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/24","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/24","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, documentation pages are empty (only 'Connect wallet'), there is no OpenAPI schema, no example request/response bodies, and the actual functionality behind '/api/v1/accounts/24' ('Premium API Access') is completely undescribed. This is effectively a stub 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'/request':13,28,171 '0.02':12,27,112,170 '000':102 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':107 '20':101 '300':137 '402':96 '6':117 'Base network API' 'USDC micropayment API' 'accept':121 'access':92 'across':45 'actual':192 'addit':144 'advertis':143 'ai':48 'analysi':148 'analyt':47 'api':5,20,37,72,91 'application/json':126 'base':8,23,68,103,109 'broader':141 'call':4,19 'categori':56 'challeng':97 'classif':151 'commit':80 'connect':183 'content':189 'convers':163 'crypto-paid API' 'data':46 'decim':118 'doc':177 'document':175 'embed':152 'enabl':36 'endpoint':44,58,84,120,145,199 'equal':111 'estim':160 'exact':133 'exchang':155 'feed':154 'financ':51 'function':193 'gas':159 'generat':165 'geocod':161 'howev':174 'includ':146 'infrastructur':54 'json-api' 'key':73 'learn':50 'limit':76 'list':88 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':49 'made':129 'micropayment endpoint' 'minimum':79 'network':9,24,69 'no-api-key' 'no-rate-limits' 'offer':40 'page':176 'paid':60 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'payment':127 'per':3,18,62,113 'per-request':61 'per-request-billing' 'platform':6,21,38,142 'point':173 'post':122 'post-method' 'premium':90 'price':153,172,178 'prompt':185 'quot':158 'rate':75,156 'readm':179 'remain':200 'request':63,98,114,123 'requir':81 'respons':195 'return':94,125,180 'schema':196 'scheme':134 'second':138 'sentiment':147 'specif':83 'substant':188 'summar':150 'text':149 'timeout':139 'token':157 'unit':104 'unverifi':201 'usdc':15,30,65,106,115 'usdc-base-network' 'use':64,116 'util':55 'valid':162 'varieti':42 'via':10,25,130 'wallet':184 'web3':52 'x402':11,26,35,132 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"d5605501-622c-4e2e-baa5-00bbc8f791b0","listingId":"4b16b4cf-a6de-42db-aac2-2ffb700d96c8","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/24","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:39:24.525Z"}],"sources":[{"listingId":"4b16b4cf-a6de-42db-aac2-2ffb700d96c8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/24","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:24.525Z","lastSeenAt":"2026-04-24T20:02:15.167Z"}],"details":{"listingId":"4b16b4cf-a6de-42db-aac2-2ffb700d96c8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/24 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/accounts/24"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/24"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","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 traditional API key registration","Making one-off API calls with instant USDC micropayments on Base","Integrating pay-per-use endpoints into agent workflows without subscription overhead"],"bestFor":["Developers who want frictionless pay-per-call API access without signup","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost, no-commitment API access"],"notFor":["Users without a Base-compatible USDC wallet","High-volume consumers who need bulk pricing or subscription discounts","Anyone requiring detailed API documentation or guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:38.99Z"},"updatedAt":"2026-04-24T20:02:15.167Z"}}