{"id":"83eab3ee-c9f7-4241-a39f-8ced0b50bdd4","shortId":"CP8fNk","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 provides account balance information 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 infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/accounts/3/balance` returns account balance data in JSON format. Payment is handled via the x402 protocol: callers include an X-PAYMENT header with a signed USDC payment of up to $0.02 (20,000 base units of USDC with 6 decimals) on Base. There are no API keys, no rate limits, and no signup required — access is granted purely through per-request micropayments.\n\nThe platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more, all at the same $0.02 price point. Documentation pages exist but appear to require a wallet connection to view, so detailed request/response schemas are not publicly available. The endpoint is live and returns a proper 402 challenge when called without payment.","tags":[],"capabilities":["x402-payment","usdc-base","account-balance","pay-per-request","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["account balance API","x402 micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","balance check endpoint","crypto micropayment API"],"warnings":["No public API documentation available — docs, pricing, and README pages all require wallet connection and show no content.","The specific purpose of /api/v1/accounts/3/balance is unclear; 'Premium API Access' is a generic label.","No request or response schema is documented or inferrable from available material.","The platform lists many endpoints but none have publicly visible documentation, raising questions about actual functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/3/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/3/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 402 challenge, but there is no OpenAPI schema, no documented request/response format, and the docs pages all just show 'Connect wallet' with no usable content. The endpoint's actual functionality (what 'accounts/3/balance' returns) is unclear beyond the generic 'Premium API Access' label. Effectively a stub 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'0.02':11,24,67,111,168 '000':113 '20':112 '402':199 '6':119 'Base network API' 'USDC pay-per-call' 'access':135 'account':2,15,32,83 'account balance API' 'account-balance' 'addit':147 'advertis':146 'ai/ml':57 'analysi':151 'analyt':56 'api':53,126 'appear':175 'avail':190 'balanc':3,16,33,84 'balance check endpoint' 'base':8,21,76,114,122 'behind':35 'broader':44 'call':52,202 'caller':96 'challeng':200 'check':1,14 'classif':154 'connect':180 'crypto micropayment API' 'data':55,60,85 'decim':120 'detail':184 'document':171 'dozen':47 'embed':155 'endpoint':28,80,148,192 'exchang':158 'exist':173 'feed':157 'finance/web3':59 'format':88 'geocod':160 'grant':137 'handl':91 'header':102 'includ':97 'infer':58 'inform':34 'infrastructur':62 'json':87 'json-response' 'key':127 'limit':130 'live':194 'lowpaymentfee' 'lowpaymentfee.com':30 'micropay':6,19,143 'network':9,22,77 'no-api-key' 'offer':46 'page':172 'part':41 'pay':50 'pay-per-cal':49 'pay-per-request' 'payment':89,101,107,204 'paywal':38 'per':12,25,51,68,141 'per-request':140 'platform':45,145 'point':170 'price':65,156,169 'proper':198 'protocol':95 'provid':31 'public':189 'pure':138 'rate':129,159 'request':13,26,69,142 'request/response':185 'requir':134,177 'return':82,196 'schema':186 'sentiment':150 'settl':71 'sign':105 'signup':133 'span':54 'specif':79 'summar':153 'text':152 'unit':115 'usdc':73,106,117 'usdc-base' 'util':63 'valid':161 'via':4,17,92 'view':182 'wallet':179 'without':203 'x':100 'x-payment':99 'x402':5,18,37,94 'x402 micropayment API' 'x402-payment'","prices":[{"id":"72064a49-22a8-4572-8374-18ff184208c0","listingId":"83eab3ee-c9f7-4241-a39f-8ced0b50bdd4","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/3/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":"2026-04-18T18:39:29.934Z"}],"sources":[{"listingId":"83eab3ee-c9f7-4241-a39f-8ced0b50bdd4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/3/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:29.934Z","lastSeenAt":"2026-04-29T05:33:52.793Z"}],"details":{"listingId":"83eab3ee-c9f7-4241-a39f-8ced0b50bdd4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/3/balance \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\" \\\n  -H \"Content-Type: application/json\"","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 network","source_url":"https://lowpaymentfee.com/api/v1/accounts/3/balance"},{"claim":"All 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"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/3/balance"}],"useCases":["Querying account balance data without needing API keys or subscriptions","Integrating pay-per-call balance lookups into automated agent workflows","Demonstrating x402 protocol micropayment flows on Base network"],"bestFor":["Agents or bots that need on-demand account balance data with no signup","Developers exploring x402 protocol integrations","Low-volume, pay-as-you-go API consumers who want to avoid subscriptions"],"notFor":["High-volume balance queries where $0.02/request adds up significantly","Users who need detailed API documentation before integrating","Applications requiring non-USDC or non-Base-network payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:38.769Z"},"updatedAt":"2026-04-29T05:33:52.793Z"}}