{"id":"60651bc9-6915-4abd-97dc-31a3fd2a8a77","shortId":"vxFhPX","kind":"x402","title":"Check account balance via x402 micropayment on Base network for $0.02 per request.","tagline":"Check account balance via x402 micropayment on Base network for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns account balance information for a specific account (account ID 149) behind an x402 paywall. It is part of a broader platform offering dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/accounts/149/balance` accepts POST requests and requires an X-PAYMENT header conforming to the x402 protocol (version 1, \"exact\" scheme). The maximum amount required is 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout window.\n\nThe platform advertises no API keys, no rate limits, and instant access. Documentation pages (/docs, /pricing, /README) appear to require a wallet connection and contain no substantive content in the crawl. There is no OpenAPI schema, no request/response examples, and no detailed documentation available for what the balance endpoint actually returns. The endpoint is confirmed live (402 challenge captured), but the lack of documentation about the response format and the purpose of this specific account balance endpoint limits its practical utility without further experimentation.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-request","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 balance check","USDC micropayment API","Base network API","pay-per-call balance","lowpaymentfee"],"warnings":["No OpenAPI or response schema available — response format is unknown","Documentation pages (/docs, /pricing, /README) are empty or wallet-gated and provide no useful information","The endpoint targets a hardcoded account ID (149); unclear if this is a demo or a real account","No request body schema documented; unclear what POST body (if any) is expected","Platform appears to be a generic x402 demo/showcase — actual data quality and reliability are unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/149/balance","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/149/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, no documentation beyond a landing page listing, and the specific purpose of this account balance endpoint is unclear. Docs pages all require wallet connection and yield no 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'/docs':156 '/pricing':157 '/readme':158 '0.02':11,24,74,124 '000':114 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':135 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':119 '1':105 '149':41 '20':113 '300':138 '402':198 '6':128 'Base network API' 'USDC micropayment API' 'accept':89 'access':153 'account':2,15,32,38,39,216 'account balance API' 'account-balance' 'actual':191 'address':134 'advertis':144 'ai/ml':64 'amount':110 'analyt':63 'api':60,146 'appear':159 'avail':185 'balanc':3,16,33,189,217 'base':8,21,83,115,121 'base-network' 'behind':42 'broader':51 'call':59 'captur':200 'challeng':199 'check':1,14 'confirm':196 'conform':99 'connect':164 'contain':166 'content':169 'crawl':172 'data':62,67 'decim':129 'detail':183 'document':154,184,205 'dozen':54 'endpoint':28,87,190,194,218 'equal':123 'exact':106 'exampl':180 'experiment':225 'finance/web3':66 'format':209 'given':125 'header':98 'id':40 'infer':65 'inform':34 'instant':152 'key':147 'lack':203 'limit':150,219 'live':197 'lowpaymentfee' 'lowpaymentfee.com':30 'maximum':109 'micropay':6,19 'network':9,22,84 'no-api-key' 'offer':53 'openapi':176 'page':155 'part':48 'pay':57 'pay-per-cal':56 'pay-per-call balance' 'pay-per-request' 'payment':97,130 'paywal':45 'per':12,25,58,75 'platform':52,143 'post':90 'practic':221 'price':72 'protocol':103 'purpos':212 'rate':149 'request':13,26,76,91 'request/response':179 'requir':93,111,161 'respons':208 'return':31,192 'schema':177 'scheme':107 'second':139 'sent':132 'servic':70 'settl':78 'span':61 'specif':37,86,215 'substant':168 'timeout':140 'unit':116 'usdc':80,118,126 'usdc-settlement' 'util':69,222 'version':104 'via':4,17 'wallet':163 'window':141 'without':223 'x':96 'x-payment':95 'x402':5,18,44,102 'x402 balance check' 'x402-payment'","prices":[{"id":"253f681f-c50f-4480-b056-6193c901b8fc","listingId":"60651bc9-6915-4abd-97dc-31a3fd2a8a77","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/149/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:41:12.112Z"}],"sources":[{"listingId":"60651bc9-6915-4abd-97dc-31a3fd2a8a77","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/149/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:12.112Z","lastSeenAt":"2026-04-27T20:34:32.373Z"}],"details":{"listingId":"60651bc9-6915-4abd-97dc-31a3fd2a8a77","quickStartSnippet":"# The endpoint requires an x402 X-PAYMENT header with USDC on Base.\n# Using curl (you need an x402-compatible client to generate the payment header):\ncurl -X POST https://lowpaymentfee.com/api/v1/accounts/149/balance \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requiring 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/149/balance"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/149/balance"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance data for account 149 via a single micropayment","Integrating pay-per-call balance checks into agent workflows without API key management","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 protocol payments","Agents needing on-demand account balance data without subscription commitments","Low-volume, pay-as-you-go API consumption on Base"],"notFor":["Users needing detailed API documentation or response schema before integrating","High-volume balance queries where per-request pricing adds up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:33.867Z"},"updatedAt":"2026-04-27T20:34:32.373Z"}}