{"id":"74185fc1-e384-4662-a2dc-17f6381d85d2","shortId":"naZp2a","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 166) behind an x402 paywall. It is part of a broader platform offering various pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe endpoint 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 x402 challenge specifies an exact-scheme payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. No API keys or rate limits are advertised; access is gated purely by micropayment.\n\nDocumentation is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. The specific behavior of the /accounts/{id}/balance endpoint (request body schema, response fields) is not documented anywhere in the crawled material. This particular endpoint is not listed on the homepage's API catalog, making its purpose and output schema unclear beyond the generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-base","account-balance","pay-per-request","no-api-key"],"categories":["finance"],"synonyms":["account balance API","x402 balance check","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee"],"warnings":["This specific endpoint (/api/v1/accounts/166/balance) is not listed in the provider's own API catalog on the homepage","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no usable content","No request body schema or response schema is available — behavior must be discovered experimentally","The endpoint path contains a hardcoded account ID (166); it is unclear whether other account IDs are supported or what authorization model applies"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/166/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/166/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation for this specific endpoint, no request/response schema, no examples, and the docs pages are empty. The endpoint isn't even listed in the site's own API catalog, making its purpose and output largely 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'/balance':184 '0.02':11,24,73,136 '000':125 '0x8335':130 '166':41 '20':124 '2913':131 '6':140 'Base network API' 'USDC pay-per-call' 'accept':86 'access':150,223 'account':2,15,32,38,39 'account balance API' 'account-balance' 'advertis':149 'ai/ml':63 'analyt':62 'anywher':194 'api':59,143,164,209,222 'balanc':3,16,33 'base':8,21,82,126,133 'behavior':179 'behind':42 'beyond':218 'bodi':187 'broader':51 'call':58 'caller':99 'catalog':210 'challeng':114 'check':1,14 'connect':170 'content':176 'crawl':197 'data':61,66 'decim':141 'doc':161 'document':156,193 'endpoint':28,85,185,201 'equal':135 'exact':118 'exact-schem':117 'extrem':158 'field':190 'finance/web3':65 'gate':152 'generic':220 'given':137 'handl':94 'header':106 'homepag':207 'id':40,183 'includ':101 'infer':64 'inform':34 'infrastructur':68 'json':91 'key':144 'label':224 'limit':147 'list':204 'lowpaymentfee' 'lowpaymentfee.com':30 'make':211 'materi':198 'micropay':6,19,155 'micropayment API' 'must':100 'network':9,22,83 'no-api-key' 'offer':53 'output':215 'page':165 'part':48 'particular':200 'pay':56 'pay-per-cal':55 'pay-per-request' 'payment':92,105,110,120 'paywal':45 'per':12,25,57,74 'platform':52 'post':87 'premium':221 'price':71,162 'prompt':172 'proof':111 'protocol':98 'pure':153 'purpos':213 'rate':146 'render':167 'request':13,26,75,88,186 'respons':189 'return':31,90 'schema':188,216 'scheme':119 'settl':77 'span':60 'spars':159 'specif':37,178 'specifi':115 'unclear':217 'unit':127 'usdc':79,129,138 'usdc-base' 'util':69 'valid':109 'various':54 'via':4,17,95 'wallet':171 'x':104 'x-payment':103 'x402':5,18,44,97,113 'x402 balance check' 'x402-payment'","prices":[{"id":"fc39e0b2-c934-47ec-9f6e-eaa1b4191bba","listingId":"74185fc1-e384-4662-a2dc-17f6381d85d2","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/166/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":"2026-04-18T18:41:21.097Z"}],"sources":[{"listingId":"74185fc1-e384-4662-a2dc-17f6381d85d2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/166/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:21.097Z","lastSeenAt":"2026-04-30T11:33:31.069Z"}],"details":{"listingId":"74185fc1-e384-4662-a2dc-17f6381d85d2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/166/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge requires up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/166/balance"},{"claim":"All listed APIs are 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":"The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance data with per-request micropayments","Integrating pay-per-call balance lookups into agent workflows","Accessing financial account information without API key registration"],"bestFor":["Agents that need on-demand account balance data without subscription commitments","Developers experimenting with x402 micropayment-gated APIs","Scenarios requiring keyless, pay-as-you-go API access on Base"],"notFor":["High-volume balance polling where per-request costs add up quickly","Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:33.499Z"},"updatedAt":"2026-04-30T11:33:31.069Z"}}