{"id":"4d2127a4-f397-4e80-aacc-0c7850eb619f","shortId":"JqQH4r","kind":"x402","title":"x402-gated account balance endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated account balance endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com provides an account balance lookup via the x402 payment protocol. The specific resource `/api/v1/accounts/173/balance` is gated behind an x402 challenge requiring payment in USDC on the Base network. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. Payment is made via the \"exact\" scheme to a specified wallet address, with a timeout of 300 seconds.\n\nThe broader lowpaymentfee.com platform advertises a suite of x402-gated APIs spanning data & analytics (metrics, reports, data export, insights), AI & machine learning (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nHowever, the specific endpoint being listed here — `/api/v1/accounts/173/balance` — is not among the publicly documented APIs on the landing page. It appears to be an account-specific balance query, possibly for internal or account-management purposes. No OpenAPI schema, request/response examples, or detailed documentation were found for this endpoint. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base-network","account-balance-query","pay-per-request","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 balance endpoint","USDC micropayment API","Base network API","pay-per-call balance","lowpaymentfee"],"warnings":["This specific endpoint (/api/v1/accounts/173/balance) is not listed among the publicly documented APIs on the provider's landing page.","No OpenAPI schema, request body format, or response schema is available.","All documentation pages (docs, API, pricing, README) returned only a 'Connect wallet' prompt with no substantive content.","The endpoint's actual functionality and response format are unknown — it may be an internal or account-specific resource."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/173/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/173/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, this specific endpoint is not documented on the site, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The purpose and output of this particular endpoint are 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'0.02':78,150 '000':69 '20':68 '300':97 '6':74 'Base network API' 'USDC micropayment API' 'account':4,18,35,189,198 'account balance API' 'account-balance-query' 'account-manag':197 'account-specif':188 'address':92 'advertis':103 'ai':119 'among':174 'amount':63 'analysi':123 'analyt':113 'api':110,155,178,216 'appear':184 'balanc':5,19,36,191 'base':8,22,59,70 'behind':49 'broader':100 'call':12,26,66 'challeng':52 'classif':126 'commit':163 'connect':225 'content':231 'convers':143 'data':112,116 'decim':75 'detail':207 'doc':215 'document':177,208 'embed':127 'endpoint':6,20,30,146,167,213 'equal':77 'estim':137 'exact':86 'exampl':205 'exchang':132 'export':117 'feed':131 'financ':128 'found':210 'gas':136 'gate':3,17,48,109 'generat':144 'geocod':141 'howev':164 'infrastructur':139 'insight':118 'intern':195 'key':156 'land':181 'learn':121 'limit':159 'list':148,169 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,101 'machin':120 'made':83 'manag':199 'maximum':62 'metric':114 'minimum':162 'network':60 'no-api-key' 'openapi':202 'page':182,220 'pay':10,24 'pay-per-cal':9,23 'pay-per-call balance' 'pay-per-request' 'payment':41,54,81 'per':11,25,65,79,151 'platform':102 'possibl':193 'price':130,217 'prompt':227 'protocol':42 'provid':33 'public':176 'purpos':200 'queri':192 'quot':135 'rate':133,158 'readm':219 'report':115 'request':80,152 'request/response':204 'requir':53,64 'resourc':45 'return':222 'schema':203 'scheme':87 'second':98 'sentiment':122 'span':111 'specif':44,166,190 'specifi':90 'substant':230 'suit':105 'summar':125 'text':124 'timeout':95 'token':134 'unit':71 'usdc':14,28,56,73 'usdc-base-network' 'util':140 'valid':142 'via':38,84 'wallet':91,226 'web3':129 'x402':2,16,40,51,108 'x402 balance endpoint' 'x402-gated':1,15,107 'x402-payment'","prices":[{"id":"175988c1-810c-4c8c-9fa7-45d1110c1d4f","listingId":"4d2127a4-f397-4e80-aacc-0c7850eb619f","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/173/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":"2026-04-18T18:41:28.925Z"}],"sources":[{"listingId":"4d2127a4-f397-4e80-aacc-0c7850eb619f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/173/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:28.925Z","lastSeenAt":"2026-04-27T18:07:21.194Z"}],"details":{"listingId":"4d2127a4-f397-4e80-aacc-0c7850eb619f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/173/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge requires maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/173/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 information via a pay-per-call model","Integrating x402-gated balance checks into automated agent workflows","Accessing account data without traditional API key provisioning"],"bestFor":["Agents or services that need on-demand account balance lookups with crypto micropayments","Developers experimenting with x402 payment protocol integrations","Use cases requiring keyless, pay-as-you-go API access on Base"],"notFor":["Users needing detailed API documentation or response schema guarantees before integration","High-volume balance queries where per-call pricing may add up","Anyone without a USDC wallet on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:33.144Z"},"updatedAt":"2026-04-27T18:07:21.194Z"}}