{"id":"5bd816b0-5ef0-452f-86e2-8ee6d6caf9aa","shortId":"UqkFAB","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 a \"Premium API Access\" resource at the path /api/v1/accounts/178/balance. It is part of a broader platform offering various pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities—all gated via the x402 payment protocol on the Base network.\n\nThe specific endpoint returns account balance information (application/json) and requires a per-call payment of up to 0.02 USDC (maxAmountRequired: 20000 base units, USDC has 6 decimals) settled on Base via the \"exact\" scheme. No API keys or rate limits are advertised; access is granted instantly upon valid x402 payment. The platform accepts payments to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the USDC contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.\n\nDocumentation is extremely sparse—the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema beyond the x402 challenge metadata, and no examples of what the balance response actually contains. The endpoint is confirmed live (returns 402 with a valid x402 challenge).","tags":[],"capabilities":["x402-payment","usdc-base","account-balance","pay-per-request","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 paid endpoint","USDC micropayment API","Base network API","lowpaymentfee","pay-per-call balance"],"warnings":["No API documentation available—docs/pricing/API pages all show only 'Connect wallet'","No request or response schema provided; unclear what data the balance endpoint returns","The specific path /api/v1/accounts/178/balance is not listed on the homepage's available APIs catalog, raising questions about its intended audience","No OpenAPI spec or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/178/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/178/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 challenge, but there is no documentation, no request/response schema, and no examples of what the balance endpoint actually returns. The listing is effectively a stub with only pricing and payment metadata 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'0.02':95 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':134 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':140 '20000':98 '402':194 '6':103 'Base network API' 'USDC micropayment API' 'accept':130 'access':37,120 'account':4,18,81 'account balance API' 'account-balance' 'actual':186 'address':133 'advertis':119 'ai/ml':60 'analyt':59 'api':36,56,113,151 'application/json':84 'balanc':5,19,82,184 'base':8,22,75,99,107,142 'beyond':173 'broader':48 'call':12,26,90 'challeng':176,199 'confirm':191 'connect':157 'contain':187 'contract':138 'data':58 'decim':104 'detail':164 'doc':148 'document':143 'endpoint':6,20,30,79,189 'exact':110 'exampl':180 'extrem':145 'finance/web3':62 'gate':3,17,67 'grant':122 'infer':61 'inform':83 'infrastructur':64 'instant':123 'key':114 'limit':117 'live':192 'lowpaymentfee' 'lowpaymentfee.com':32 'maxamountrequir':97 'metadata':177 'network':76 'no-api-key' 'offer':50 'openapi':168 'page':152 'part':45 'path':41 'pay':10,24,53 'pay-per-cal':9,23 'pay-per-call balance' 'pay-per-request':52 'payment':71,91,127,131 'per':11,25,54,89 'per-cal':88 'platform':49,129 'premium':35 'price':149 'prompt':159 'protocol':72 'provid':33 'rate':116 'render':154 'request':55 'request/response':171 'requir':86 'resourc':38 'respons':185 'return':80,193 'schema':172 'scheme':111 'settl':105 'span':57 'spars':146 'spec':169 'specif':78 'technic':163 'unit':100 'upon':124 'usdc':14,28,96,101,137 'usdc-base' 'use':135 'util':65 'valid':125,197 'various':51 'via':68,108 'wallet':158 'x402':2,16,70,126,175,198 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"9594d18c-50ce-4ca7-b518-c8ffaa9e7edb","listingId":"5bd816b0-5ef0-452f-86e2-8ee6d6caf9aa","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/178/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":"2026-04-18T18:41:29.543Z"}],"sources":[{"listingId":"5bd816b0-5ef0-452f-86e2-8ee6d6caf9aa","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/178/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:29.543Z","lastSeenAt":"2026-04-27T18:07:21.299Z"}],"details":{"listingId":"5bd816b0-5ef0-452f-86e2-8ee6d6caf9aa","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/178/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":"Endpoint returns 402 with x402 challenge requiring up to 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/178/balance"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/178/balance"}],"useCases":["Querying account balance data without needing API key registration","Programmatic access to balance information via crypto micropayments","Agent-driven financial data retrieval with instant x402 settlement"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers who cannot transact in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:33.012Z"},"updatedAt":"2026-04-27T18:07:21.299Z"}}