{"id":"f60cd5a3-d63c-4cc8-a36a-f7b76f608f42","shortId":"nArNzU","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 specified account (account ID 69 in this case). It is part of a broader suite of pay-per-call APIs offered by lowpaymentfee.com, all settled via the x402 protocol using USDC on the Base network.\n\nThe endpoint accepts POST requests and requires an X-PAYMENT header containing a valid x402 payment proof. The price per call is $0.02 (20,000 base units of USDC with 6 decimals). No API keys or rate limits are advertised — access is gated purely by micropayment. The response MIME type is application/json.\n\nlowpaymentfee.com also offers endpoints across data/analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation), all at the same $0.02/request price point. Documentation pages beyond the landing page were largely empty (showing only a \"Connect wallet\" prompt), so details about request/response schemas for this specific balance endpoint are not available.","tags":[],"capabilities":["x402-payment","usdc-base-network","account-balance","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 balance check","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","web3 balance endpoint"],"warnings":["No request or response schema available — the endpoint's exact input parameters and output format are unknown.","Documentation pages (/docs, /api, /pricing, /README) are empty, showing only a wallet-connect prompt.","The specific account ID '69' is hardcoded in the endpoint path; it is unclear whether other account IDs are supported or what 'balance' returns.","The broader lowpaymentfee.com platform lists many endpoints but provides no detailed documentation for any of them."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/69/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/69/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 confirmed) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no request/response body documentation, and all doc/pricing/API pages beyond the landing page are empty stubs. The specific purpose of the balance endpoint is only inferable from its URL path. This is effectively a stub 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'0.02':11,24,96,158 '000':98 '20':97 '6':104 '69':41 'Base network API' 'USDC pay-per-call' 'accept':75 'access':114 'account':2,15,32,38,39 'account balance API' 'account-balance' 'across':130 'advertis':113 'ai/ml':132 'also':127 'analysi':134 'api':57,107 'application/json':125 'avail':189 'balanc':3,16,33,185 'base':8,21,71,99 'beyond':164 'broader':50 'call':56,94 'case':44 'check':1,14 'classif':136 'connect':174 'contain':85 'convers':152 'data/analytics':131 'decim':105 'detail':178 'document':162 'embed':137 'empti':170 'endpoint':28,74,129,186 'estim':146 'exchang':141 'feed':140 'finance/web3':138 'gas':145 'gate':116 'generat':153 'geocod':150 'header':84 'id':40 'inform':34 'infrastructur':148 'json-response' 'key':108 'land':166 'larg':169 'limit':111 'lowpaymentfee' 'lowpaymentfee.com':30,60,126 'micropay':6,19,119 'micropayment API' 'mime':122 'network':9,22,72 'no-api-key' 'offer':58,128 'page':163,167 'part':47 'pay':54 'pay-per-cal':53 'pay-per-request' 'payment':83,89 'per':12,25,55,93 'point':161 'post':76 'price':92,139,160 'prompt':176 'proof':90 'protocol':66 'pure':117 'quot':144 'rate':110,142 'request':13,26,77 'request/response':180 'requir':79 'respons':121 'return':31 'schema':181 'sentiment':133 'settl':62 'show':171 'specif':184 'specifi':37 'suit':51 'summar':135 'token':143 'type':123 'unit':100 'usdc':68,102 'usdc-base-network' 'use':67 'util':149 'valid':87,151 'via':4,17,63 'wallet':175 'web3 balance endpoint' 'x':82 'x-payment':81 'x402':5,18,65,88 'x402 balance check' 'x402-payment'","prices":[{"id":"093c3570-46d5-46ed-a4b9-1ffd6a2cccb9","listingId":"f60cd5a3-d63c-4cc8-a36a-f7b76f608f42","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/69/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":"2026-04-18T18:40:00.707Z"}],"sources":[{"listingId":"f60cd5a3-d63c-4cc8-a36a-f7b76f608f42","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/69/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:00.707Z","lastSeenAt":"2026-04-28T05:33:51.438Z"}],"details":{"listingId":"f60cd5a3-d63c-4cc8-a36a-f7b76f608f42","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/69/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 HTTP 402 with x402 version 1 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/69/balance"},{"claim":"Price is $0.02 per request (maxAmountRequired 20000 base units of USDC, 6 decimals)","source_url":"https://lowpaymentfee.com/api/v1/accounts/69/balance"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/69/balance"}],"useCases":["Querying account balance information programmatically with per-call payment","Integrating balance checks into agent workflows without pre-registration or API keys","Demonstrating x402 micropayment protocol usage on Base network"],"bestFor":["Agents needing on-demand account balance data without subscription commitments","Developers experimenting with x402 protocol micropayments","Low-volume or sporadic balance lookups where pay-per-call is cost-effective"],"notFor":["High-frequency balance polling where per-call costs would accumulate quickly","Users who need detailed documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:37.336Z"},"updatedAt":"2026-04-28T05:33:51.438Z"}}