{"id":"fb6e58ae-54be-49f6-a506-555d23e3b1bc","shortId":"FHckUd","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 specific account (account ID 31) via the x402 payment protocol. It is part of a broader platform offering data & analytics, AI/ML inference, finance/Web3, and infrastructure utility APIs, all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe endpoint accepts POST requests and requires an X-PAYMENT header conforming to x402 version 1 with the \"exact\" payment scheme. The maximum amount required is 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The response MIME type is application/json.\n\nThe platform advertises no API keys, no rate limits, and instant access. Documentation pages (/docs, /pricing, /README) appear to require a wallet connection and contain no additional readable content. Because of this, the actual response schema and request body format for this specific balance endpoint are unknown — only the x402 payment challenge has been captured. The endpoint is live and returning a proper 402 challenge.","tags":[],"capabilities":["x402-payment","usdc-base","account-balance","micropayment","json-response","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","USDC micropayment API","x402 balance check","Base network API","pay-per-request API","crypto balance endpoint","lowpaymentfee"],"warnings":["No request body schema or response schema available — actual payload format is unknown","Documentation pages (/docs, /pricing, /README) are wallet-gated and contain no readable content","The specific meaning of 'accounts/31/balance' is undocumented; it is unclear what account or balance type this refers to","The platform lists many endpoints but none have detailed documentation visible without wallet connection"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/31/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/31/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 documentation of request/response formats, and the docs/pricing/README pages are empty (wallet-gated). The specific purpose of 'account 31 balance' is unclear. Effectively a stub 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'/pricing':154 '/readme':155 '0.02':11,24,67,116 '000':106 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':127 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':111 '1':94 '20':105 '300':130 '31':41 '402':202 '6':120 'Base network API' 'USDC micropayment API' 'accept':80 'access':150 'account':2,15,32,38,39 'account balance API' 'account-balance' 'actual':172 'addit':165 'address':126 'advertis':141 'ai/ml':57 'amount':102 'analyt':56 'api':63,143 'appear':156 'application/json':138 'balanc':3,16,33,182 'base':8,21,76,107,113 'bodi':177 'broader':52 'captur':193 'challeng':190,203 'check':1,14 'conform':90 'connect':161 'contain':163 'content':167 'crypto balance endpoint' 'data':55 'decim':121 'document':151 'endpoint':28,79,183,195 'equal':115 'exact':97 'finance/web3':59 'format':178 'given':117 'header':89 'id':40 'infer':58 'inform':34 'infrastructur':61 'instant':149 'json-response' 'key':144 'limit':147 'live':197 'lowpaymentfee' 'lowpaymentfee.com':30 'maximum':101 'micropay':6,19 'micropayment' 'mime':135 'network':9,22,77 'no-api-key' 'offer':54 'page':152 'part':49 'pay-per-request API' 'payment':45,88,98,122,189 'per':12,25,68 'platform':53,140 'post':81 'price':65 'proper':201 'protocol':46 'rate':146 'readabl':166 'request':13,26,69,82,176 'requir':84,103,158 'respons':134,173 'return':31,199 'schema':174 'scheme':99 'second':131 'sent':124 'settl':71 'specif':37,181 'timeout':132 'type':136 'unit':108 'unknown':185 'usdc':73,110,118 'usdc-base' 'util':62 'version':93 'via':4,17,42 'wallet':160 'x':87 'x-payment':86 'x402':5,18,44,92,188 'x402 balance check' 'x402-payment'","prices":[{"id":"0d64b31d-d6e6-4349-9cfc-e54d48d184d8","listingId":"fb6e58ae-54be-49f6-a506-555d23e3b1bc","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/31/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":"2026-04-18T18:39:31.154Z"}],"sources":[{"listingId":"fb6e58ae-54be-49f6-a506-555d23e3b1bc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/31/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:31.154Z","lastSeenAt":"2026-04-28T08:04:42.465Z"}],"details":{"listingId":"fb6e58ae-54be-49f6-a506-555d23e3b1bc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/31/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 endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/31/balance"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/31/balance"}],"useCases":["Querying account balance data with per-request USDC micropayments","Integrating pay-as-you-go balance lookups into agent workflows","Accessing financial account information without API key registration"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Use cases needing low-cost, keyless account balance queries","Developers prototyping x402 payment flows"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-throughput batch queries where per-request payment overhead is impractical","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:38.725Z"},"updatedAt":"2026-04-28T08:04:42.465Z"}}