{"id":"882fc0d1-c95a-4251-8c3a-4b4d773747ac","shortId":"3zE23S","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 account ID 38. 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 specific endpoint `/api/v1/accounts/38/balance` accepts POST requests and is gated behind an x402 payment challenge. The maximum amount required per call is 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 USD (USDC uses 6 decimals). Payment is made via the `exact` scheme with a 300-second timeout. No API keys or rate limits are advertised; access is instant once payment is included in the X-PAYMENT header.\n\nDocumentation on the platform 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. The endpoint is confirmed live (returns a proper 402 challenge), but the actual functionality and response format must be inferred from the endpoint path alone.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-request","no-api-key"],"categories":["finance"],"synonyms":["account balance API","x402 balance check","USDC micropayment API","Base network API","pay-per-call balance","lowpaymentfee"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no technical content.","No OpenAPI or output schema provided; response format for the balance endpoint is entirely unknown.","The endpoint path references a hardcoded account ID (38); it is unclear whether this is a demo or a general-purpose endpoint.","No request body schema documented — unclear what, if any, POST body is expected."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/38/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/38/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages return only a wallet-connect prompt. The actual response format and input parameters are unknown, making this effectively a stub 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'0.02':11,24,105 '000':95 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':100 '20':94 '300':120 '38':38 '402':196 '6':109 'Base network API' 'USDC micropayment API' 'accept':76 'access':131 'account':2,15,32,36 'account balance API' 'account-balance' 'across':52 'actual':200 'addit':167 'advertis':130 'ai/ml':55 'alon':212 'amount':89 'analyt':54 'api':51,124,153 'balanc':3,16,33,185 'base':8,21,68,96,102 'base-network' 'behind':82 'broader':44 'call':92 'categori':59 'challeng':86,197 'check':1,14 'confirm':191 'connect':162 'contain':187 'data':53 'decim':110 'descript':180 'detail':169 'doc':152 'document':144 'endpoint':28,74,189,210 'equal':104 'exact':116 'exampl':177 'extrem':149 'field':183 'finance/web3':56 'format':204 'function':201 'gate':81 'header':143 'id':37 'includ':137 'infer':207 'inform':34 'infrastructur':58 'instant':133 'key':125 'limit':128 'live':192 'lowpaymentfee' 'lowpaymentfee.com':30 'made':113 'maximum':88 'micropay':6,19 'must':205 'network':9,22,69 'no-api-key' 'offer':46 'openapi':173 'page':157 'part':41 'path':211 'pay':48 'pay-per-call balance' 'pay-per-request':47 'payment':85,111,135,142 'per':12,25,49,91 'platform':45,147 'post':77 'price':154 'prompt':164 'proper':195 'protocol':65 'rate':127 'readm':156 'render':159 'request':13,26,50,78 'request/response':176 'requir':90 'respons':186,203 'return':31,193 'schema':174 'scheme':117 'second':121 'settl':61 'spars':150 'specif':73 'technic':168 'timeout':122 'unit':97 'usd':106 'usdc':71,99,107 'usdc-settlement' 'use':70,108 'via':4,17,62,114 'wallet':163 'x':141 'x-payment':140 'x402':5,18,64,84 'x402 balance check' 'x402-payment'","prices":[{"id":"f00688e1-e980-4b46-9111-28dab43b80ae","listingId":"882fc0d1-c95a-4251-8c3a-4b4d773747ac","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/38/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":"2026-04-18T18:39:35.944Z"}],"sources":[{"listingId":"882fc0d1-c95a-4251-8c3a-4b4d773747ac","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/38/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:35.944Z","lastSeenAt":"2026-05-01T04:04:34.663Z"}],"details":{"listingId":"882fc0d1-c95a-4251-8c3a-4b4d773747ac","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/38/balance \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\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/38/balance"},{"claim":"Platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/38/balance"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying account balance data on-demand with per-request USDC micropayments","Integrating balance checks into agent workflows without API key management","Programmatic account monitoring via x402-enabled HTTP calls"],"bestFor":["Agents or bots that need simple balance lookups without subscription overhead","Developers experimenting with x402 payment-gated APIs on Base","Low-volume, on-demand account balance queries"],"notFor":["High-frequency balance polling where per-request fees add up quickly","Users who need detailed documentation or response schema guarantees before integrating","Non-crypto-native users unfamiliar with x402 payment headers"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:38.485Z"},"updatedAt":"2026-05-01T04:04:34.663Z"}}