{"id":"e07dec17-df2a-4482-8616-7ebb304b8a74","shortId":"svA6ex","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 account ID 87. It is part of a broader platform offering dozens of pay-per-call API endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utility categories. All endpoints are gated via the x402 payment protocol, settling in USDC on the Base network.\n\nThe specific endpoint `/api/v1/accounts/87/balance` is listed under \"Premium API Access\" and accepts POST requests. Payment is handled inline: callers attach an X-PAYMENT header with a signed USDC payment of up to 20,000 base units (i.e., $0.02 given USDC's 6 decimals). There are no API keys, no rate limits, and no subscription commitments — each call is independently paid for at the time of the request.\n\nThe platform advertises a uniform $0.02-per-request pricing model across all its endpoints. Documentation pages (/docs, /pricing, /README) appear to require a wallet connection and do not expose further technical detail, so the exact response schema for this balance endpoint is unknown. The x402 challenge was successfully captured, confirming the endpoint is live and accepting payment challenges with a 300-second timeout.","tags":[],"capabilities":["x402-payment","usdc-base-network","account-balance","pay-per-request","no-api-key","post-method"],"categories":["finance","infrastructure"],"synonyms":["account balance API","USDC micropayment API","x402 balance check","Base network API","pay-per-call balance","lowpaymentfee API","crypto payment API"],"warnings":["No OpenAPI or response schema available — the exact shape of the response is unknown.","Documentation pages (/docs, /pricing, /README) all render only a 'Connect wallet' prompt with no usable content.","The endpoint path references a hardcoded account ID (87); it is unclear whether this is a demo or a real account.","The description 'Premium API Access' is generic and does not clarify what balance data is returned."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/87/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/87/balance","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 documented request/response format, and all documentation pages behind the landing page require wallet connection and yield no content. The specific purpose of 'account 87 balance' is 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'/docs':166 '/pricing':167 '/readme':168 '0.02':11,24,119,154 '000':115 '20':114 '300':210 '6':123 '87':38 'Base network API' 'USDC micropayment API' 'accept':92,205 'access':90 'account':2,15,32,36 'account balance API' 'account-balance' 'across':55,160 'advertis':151 'ai/ml':58 'analyt':57 'api':53,89,128 'appear':169 'attach':100 'balanc':3,16,33,189 'base':8,21,79,116 'broader':44 'call':52,138 'caller':99 'captur':198 'categori':64 'challeng':195,207 'check':1,14 'commit':136 'confirm':199 'connect':174 'crypto payment API' 'data':56 'decim':124 'detail':181 'document':164 'dozen':47 'endpoint':28,54,66,83,163,190,201 'exact':184 'expos':178 'finance/web3':60 'gate':68 'given':120 'handl':97 'header':105 'i.e':118 'id':37 'independ':140 'infer':59 'inform':34 'infrastructur':62 'inlin':98 'key':129 'limit':132 'list':86 'live':203 'lowpaymentfee API' 'lowpaymentfee.com':30 'micropay':6,19 'model':159 'network':9,22,80 'no-api-key' 'offer':46 'page':165 'paid':141 'part':41 'pay':50 'pay-per-cal':49 'pay-per-call balance' 'pay-per-request' 'payment':72,95,104,110,206 'per':12,25,51,156 'per-request':155 'platform':45,150 'post':93 'post-method' 'premium':88 'price':158 'protocol':73 'rate':131 'request':13,26,94,148,157 'requir':171 'respons':185 'return':31 'schema':186 'second':211 'settl':74 'sign':108 'specif':82 'subscript':135 'success':197 'technic':180 'time':145 'timeout':212 'uniform':153 'unit':117 'unknown':192 'usdc':76,109,121 'usdc-base-network' 'util':63 'via':4,17,69 'wallet':173 'x':103 'x-payment':102 'x402':5,18,71,194 'x402 balance check' 'x402-payment'","prices":[{"id":"40e1fb2f-b9fd-4ecc-8263-a70c8884ac22","listingId":"e07dec17-df2a-4482-8616-7ebb304b8a74","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/87/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":"2026-04-18T18:40:15.216Z"}],"sources":[{"listingId":"e07dec17-df2a-4482-8616-7ebb304b8a74","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/87/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:15.216Z","lastSeenAt":"2026-04-28T03:33:09.577Z"}],"details":{"listingId":"e07dec17-df2a-4482-8616-7ebb304b8a74","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/87/balance \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Uniform $0.02 per request pricing, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired 20000 in USDC (asset 0x8335…) on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/accounts/87/balance"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance data on-demand without subscription overhead","Integrating balance checks into automated agent workflows that settle payments in USDC","Building dashboards that pull account balances via micropayment-gated endpoints"],"bestFor":["Agents or bots that need one-off balance lookups without managing API keys","Developers prototyping on Base network with USDC micropayments","Low-volume consumers who want pay-as-you-go pricing with no commitments"],"notFor":["High-frequency polling where $0.02 per request adds up quickly","Users who need detailed documentation or OpenAPI schemas before integrating","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:36.637Z"},"updatedAt":"2026-04-28T03:33:09.577Z"}}