{"id":"1f944ed9-7a10-4554-8153-ea855ee8217c","shortId":"UxmAqF","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 provides account balance information behind an x402 paywall. It is part of a broader platform offering various API categories including data analytics, AI/ML inference, finance/Web3, and infrastructure utilities—all priced at $0.02 per request settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/accounts/185/balance` accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers must include an X-PAYMENT header with a valid payment proof. The challenge advertises a maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 given USDC's 6 decimals. No API keys or rate limits are required—access is purely pay-per-call.\n\nDocumentation on the site is extremely sparse; the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns 402 challenge correctly), but the actual response format after successful payment is unknown.","tags":[],"capabilities":["account-balance","x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","wallet balance check","x402 balance endpoint","micropayment API","USDC pay-per-call","Base network API"],"warnings":["No OpenAPI or schema documentation available","All documentation pages render only 'Connect wallet' with no content","No request body schema or response format documented","Purpose of 'account 185' is unexplained—may be a demo or placeholder","Platform appears to be a generic x402 demo site with many listed endpoints but no substantive docs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/185/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/185/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge, but there is no documentation, no OpenAPI spec, no request/response examples, and the docs pages are empty. The purpose of the specific endpoint (account 185 balance) is unclear and 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'0.02':11,24,62,118 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':113 '20000':108 '402':185 '6':122 'Base network API' 'USDC pay-per-call' 'accept':76 'access':132 'account':2,15,32 'account balance API' 'account-balance' 'actual':190 'addit':162 'advertis':104 'ai/ml':53 'analyt':52 'api':48,125,148 'avail':178 'balanc':3,16,33 'base':8,21,70,109,115 'base-network' 'behind':35 'broader':44 'call':138 'caller':89 'categori':49 'challeng':103,186 'check':1,14 'confirm':182 'connect':157 'correct':187 'data':51 'decim':123 'detail':164 'doc':147 'document':139,173 'endpoint':28,74,180 'equal':117 'exampl':176 'extrem':144 'finance/web3':55 'format':192 'given':119 'handl':84 'header':96 'includ':50,91 'infer':54 'inform':34 'infrastructur':57 'json':81 'key':126 'limit':129 'live':183 'lowpaymentfee.com':30 'maxamountrequir':106 'micropay':6,19 'micropayment API' 'must':90 'network':9,22,71 'no-api-key' 'offer':46 'openapi':168 'page':152 'part':41 'pay':136 'pay-per-cal':135 'pay-per-request' 'payload':177 'payment':82,95,100,195 'paywal':38 'per':12,25,63,137 'platform':45 'post':77 'price':60,149 'prompt':159 'proof':101 'protocol':88 'provid':31 'pure':134 'rate':128 'readm':151 'render':154 'request':13,26,64,78 'request/response':171 'requir':131 'respons':191 'return':80,184 'schema':172 'settl':65 'site':142 'spars':145 'spec':169 'specif':73 'success':194 'technic':163 'unit':110 'unknown':197 'usdc':67,112,120 'usdc-settlement' 'util':58 'valid':99 'various':47 'via':4,17,85 'wallet':158 'wallet balance check' 'x':94 'x-payment':93 'x402':5,18,37,87 'x402 balance endpoint' 'x402-payment'","prices":[{"id":"875abb5e-1ef0-4a76-bf0d-09416237a7c4","listingId":"1f944ed9-7a10-4554-8153-ea855ee8217c","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/185/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":"2026-04-18T18:41:36.767Z"}],"sources":[{"listingId":"1f944ed9-7a10-4554-8153-ea855ee8217c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/185/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:36.767Z","lastSeenAt":"2026-04-27T18:07:21.604Z"}],"details":{"listingId":"1f944ed9-7a10-4554-8153-ea855ee8217c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/185/balance \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\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 advertising USDC on Base at maxAmountRequired 20000 (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/accounts/185/balance"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/185/balance"}],"useCases":["Querying account balance information programmatically with per-call payment","Integrating balance checks into agent workflows without pre-registration","Demonstrating x402 protocol micropayment flows"],"bestFor":["Agents needing on-demand account balance data without API key setup","Developers experimenting with x402 pay-per-call patterns","Low-volume balance queries where subscription pricing is unnecessary"],"notFor":["High-volume balance polling where per-call costs accumulate quickly","Users who need detailed documentation or guaranteed SLAs","Applications requiring authenticated multi-account management"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:32.635Z"},"updatedAt":"2026-04-27T18:07:21.604Z"}}