{"id":"4a0e3918-31fd-4932-9731-49224bd2f0e8","shortId":"fnfeQr","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 145 in this case). It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories, all settled via the x402 protocol on the Base network using USDC.\n\nThe endpoint accepts POST requests and returns JSON. Payment is handled inline via the x402 protocol: callers include an X-PAYMENT header with a signed USDC payment on Base. The maximum amount required per call is 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). The platform advertises no API keys, no rate limits, and instant access — you pay per request with no subscriptions or commitments.\n\nNote that while the platform lists many endpoint categories (analytics, AI, finance, utilities), the specific endpoint being listed here is `/api/v1/accounts/145/balance`, which appears to be an account balance lookup. Documentation beyond the landing page 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 schema, no request/response examples, and no description of what fields the balance response contains.","tags":[],"capabilities":["x402-payment","usdc-base-network","account-balance","pay-per-request","json-response"],"categories":["finance"],"synonyms":["account balance API","x402 balance check","USDC micropayment API","Base network API","pay-per-call balance","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All doc/pricing/README pages return only a 'Connect wallet' prompt with no content","The endpoint path includes a hardcoded account ID (145); it is unclear whether other account IDs are supported or what 'accounts' refers to","No examples of successful responses are available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/145/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/145/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 captured) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages beyond the landing page are empty ('Connect wallet' only). The purpose of this specific endpoint (account 145 balance) is vague with no field-level 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'0.02':11,24,121 '000':116 '145':41 '20':115 '6':126 'Base network API' 'USDC micropayment API' 'accept':80 'access':139 'account':2,15,32,38,39,175 'account balance API' 'account-balance' 'across':58 'addit':202 'advertis':130 'ai':159 'ai/ml':61 'amount':110 'analyt':60,158 'api':57,132,188 'appear':171 'balanc':3,16,33,176,220 'base':8,21,74,107,117 'beyond':179 'broader':50 'call':113 'caller':94 'case':44 'categori':65,157 'check':1,14 'commit':148 'connect':197 'contain':222 'data':59 'decim':127 'descript':215 'detail':204 'doc':187 'document':178 'endpoint':28,79,156,164 'exampl':212 'extrem':184 'field':218 'financ':160 'finance/web3':62 'handl':88 'header':100 'id':40 'includ':95 'inform':34 'infrastructur':64 'inlin':89 'instant':138 'json':85 'json-response' 'key':133 'land':181 'limit':136 'list':154,166 'lookup':177 'lowpaymentfee' 'lowpaymentfee.com':30 'mani':155 'maximum':109 'micropay':6,19 'network':9,22,75 'note':149 'offer':52 'openapi':208 'page':182,192 'part':47 'pay':54,141 'pay-per-call balance' 'pay-per-request':53 'payment':86,99,105 'per':12,25,55,112,142 'platform':51,129,153 'post':81 'price':189 'prompt':199 'protocol':71,93 'rate':135 'readm':191 'render':194 'request':13,26,56,82,143 'request/response':211 'requir':111 'respons':221 'return':31,84 'schema':209 'settl':67 'sign':103 'sinc':123 'spars':185 'specif':163 'specifi':37 'subscript':146 'technic':203 'unit':118 'usd':122 'usdc':77,104,120,124 'usdc-base-network' 'use':76,125 'util':161 'via':4,17,68,90 'wallet':198 'x':98 'x-payment':97 'x402':5,18,70,92 'x402 balance check' 'x402-payment'","prices":[{"id":"34ab55b5-0cbe-4805-9253-3ffd7576fd4a","listingId":"4a0e3918-31fd-4932-9731-49224bd2f0e8","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/145/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":"2026-04-18T18:41:05.398Z"}],"sources":[{"listingId":"4a0e3918-31fd-4932-9731-49224bd2f0e8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/145/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:05.398Z","lastSeenAt":"2026-04-30T15:04:17.251Z"}],"details":{"listingId":"4a0e3918-31fd-4932-9731-49224bd2f0e8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/145/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\"","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 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/145/balance"},{"claim":"Maximum amount required is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/accounts/145/balance"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (docs, api, pricing, README) render only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying account balance information programmatically with per-request USDC micropayments","Integrating balance checks into agent workflows that settle payments on Base L2","Accessing financial account data without API keys or subscriptions"],"bestFor":["Agents or bots that need on-demand account balance lookups with crypto micropayments","Developers experimenting with x402 protocol integrations on Base","Use cases requiring keyless, pay-as-you-go API access"],"notFor":["Users who need detailed API documentation or response schema guarantees before integrating","High-volume balance queries where per-request pricing may add up compared to subscription APIs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:34.242Z"},"updatedAt":"2026-04-30T15:04:17.251Z"}}