{"id":"09770cbe-e762-4b7c-a63e-04f1ea69fa14","shortId":"v4U9U6","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 (ID 162) 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 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. The payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe platform advertises no API keys, no rate limits, and instant access. Documentation pages (/docs, /pricing, /README) appear to require wallet connection and contain no substantive content in the crawl. As a result, the actual response schema, request parameters, and detailed behavior of this specific balance endpoint are unknown. The endpoint is live and returning a proper 402 challenge.","tags":[],"capabilities":["x402-payment","usdc-base","account-balance","pay-per-call","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 balance check","USDC micropayment API","Base network API","pay-per-request balance","lowpaymentfee"],"warnings":["Documentation pages (/docs, /pricing, /README) return no useful content — they all require wallet connection","No request or response schema available; actual behavior of the balance endpoint is unknown","The specific account ID 162 is hardcoded in the URL — unclear if this is a demo or a real account","The broader platform lists many endpoints but none have documented schemas in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/162/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/162/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 and returns a valid x402 challenge, but there is no OpenAPI schema, no documentation content (all doc pages require wallet connection), no example request/response, and the purpose of this specific account balance endpoint is vague. The listing is essentially a stub with pricing and protocol details 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'/pricing':169 '/readme':170 '0.02':11,24,73,136 '000':125 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':148 '0x8335':130 '162':40 '20':124 '2913':131 '300':151 '402':211 '6':140 'Base network API' 'USDC micropayment API' 'accept':86 'access':165 'account':2,15,32,38 'account balance API' 'account-balance' 'actual':188 'address':147 'advertis':156 'ai/ml':63 'analyt':62 'api':59,158 'appear':171 'balanc':3,16,33,199 'base':8,21,82,126,133 'behavior':195 'behind':41 'broader':50 'call':58 'caller':99 'challeng':114,212 'check':1,14 'connect':175 'contain':177 'content':180 'crawl':183 'data':61,66 'decim':141 'detail':194 'direct':145 'document':166 'dozen':53 'endpoint':28,85,200,204 'equal':135 'exact':118 'exact-schem':117 'finance/web3':65 'given':137 'handl':94 'header':106 'id':39 'includ':101 'infer':64 'inform':34 'instant':164 'json':91 'json-response' 'key':159 'limit':162 'live':206 'lowpaymentfee' 'lowpaymentfee.com':30 'micropay':6,19 'must':100 'network':9,22,83 'no-api-key' 'offer':52 'page':167 'paramet':192 'part':47 'pay':56 'pay-per-cal':55 'pay-per-call' 'pay-per-request balance' 'payment':92,105,110,120,143 'paywal':44 'per':12,25,57,74 'platform':51,155 'post':87 'price':71 'proof':111 'proper':210 'protocol':98 'rate':161 'request':13,26,75,88,191 'requir':173 'respons':189 'result':186 'return':31,90,208 'schema':190 'scheme':119 'second':152 'servic':69 'settl':77 'span':60 'specif':37,198 'specifi':115 'substant':179 'timeout':153 'unit':127 'unknown':202 'usdc':79,129,138 'usdc-base' 'util':68 'valid':109 'via':4,17,95 'wallet':174 'x':104 'x-payment':103 'x402':5,18,43,97,113 'x402 balance check' 'x402-payment'","prices":[{"id":"ba344bcf-237c-4322-a30c-982017628486","listingId":"09770cbe-e762-4b7c-a63e-04f1ea69fa14","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/162/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":"2026-04-18T18:41:19.926Z"}],"sources":[{"listingId":"09770cbe-e762-4b7c-a63e-04f1ea69fa14","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/162/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:19.926Z","lastSeenAt":"2026-04-27T19:33:55.247Z"}],"details":{"listingId":"09770cbe-e762-4b7c-a63e-04f1ea69fa14","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/162/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 endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/162/balance"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/162/balance"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Payment timeout is 300 seconds and payTo address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/accounts/162/balance"}],"useCases":["Querying account balance data programmatically with per-call USDC micropayments","Integrating balance lookups into agent workflows without API key management","Demonstrating x402 protocol payment flows on Base network"],"bestFor":["Developers experimenting with x402 micropayment protocols","Agents needing on-demand account balance data without subscription commitments","Low-volume, pay-as-you-go API consumers on Base"],"notFor":["High-volume balance queries where per-call pricing adds up quickly","Users who need detailed documentation or guaranteed SLAs","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:33.541Z"},"updatedAt":"2026-04-27T19:33:55.247Z"}}