{"id":"ec545578-f5c0-44e2-a775-2e0d226e89e7","shortId":"GNxPea","kind":"x402","title":"x402-gated account balance endpoint on Base, paying $0.02 per request in USDC.","tagline":"x402-gated account balance endpoint on Base, paying $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides a premium API access point for retrieving account balance information (specifically account #47). It is part of a broader platform offering various x402-protocol-gated APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities—all priced at $0.02 per request settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/accounts/47/balance` accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers must include an X-PAYMENT header with a valid payment proof. The challenge advertises a maxAmountRequired of 20000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. No API keys or rate limits are imposed; access is purely pay-per-call.\n\nThe platform's documentation pages are minimal (only showing a \"Connect wallet\" prompt), so details about the response schema, supported request parameters, or the exact nature of the \"balance\" data returned are not documented in the crawled material. The endpoint is confirmed live via a valid 402 challenge response.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call balance","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for this endpoint","Docs, pricing, and README pages all render only a 'Connect wallet' prompt with no useful content","The specific data returned by /api/v1/accounts/47/balance is undocumented—purpose is inferred solely from the URL path","Platform appears to be a generic demo or placeholder; actual utility of responses is unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/47/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/47/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but there is no documentation on request/response schemas, no OpenAPI spec, and the docs pages are empty stubs. The purpose of the 'account balance' endpoint is unclear beyond its 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'0.02':10,24,73,130 '0x8335':124 '20000':119 '2913':125 '402':197 '47':46 '6':134 'Base network API' 'USDC micropayment API' 'accept':87 'access':37,144 'account':4,18,41,45 'account balance API' 'account-balance' 'advertis':115 'ai/ml':64 'analyt':63 'api':36,60,137 'balanc':5,19,42,179 'base':8,22,81,120,127 'base-network' 'broader':52 'call':150 'caller':100 'challeng':114,198 'confirm':192 'connect':161 'crawl':187 'data':62,180 'decim':135 'detail':165 'document':154,184 'endpoint':6,20,30,85,190 'equal':129 'exact':175 'finance/web3':66 'gate':3,17,59 'given':131 'handl':95 'header':107 'impos':143 'includ':102 'infer':65 'inform':43 'infrastructur':68 'json':92 'json-response' 'key':138 'limit':141 'live':193 'lowpaymentfee' 'lowpaymentfee.com':32 'materi':188 'maxamountrequir':117 'minim':157 'must':101 'natur':176 'network':82 'no-api-key' 'offer':54 'page':155 'paramet':172 'part':49 'pay':9,23,148 'pay-per-cal':147 'pay-per-call balance' 'pay-per-request' 'payment':93,106,111 'per':11,25,74,149 'platform':53,152 'point':38 'post':88 'premium':35 'price':71 'prompt':163 'proof':112 'protocol':58,99 'provid':33 'pure':146 'rate':140 'request':12,26,75,89,171 'respons':168,199 'retriev':40 'return':91,181 'schema':169 'settl':76 'show':159 'span':61 'specif':44,84 'support':170 'unit':121 'usdc':14,28,78,123,132 'usdc-settlement' 'util':69 'valid':110,196 'various':55 'via':96,194 'wallet':162 'x':105 'x-payment':104 'x402':2,16,57,98 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment' 'x402-protocol-gated':56","prices":[{"id":"0b10688b-87c1-478d-8b83-8ea0618e0eef","listingId":"ec545578-f5c0-44e2-a775-2e0d226e89e7","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/47/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":"2026-04-18T18:39:43.179Z"}],"sources":[{"listingId":"ec545578-f5c0-44e2-a775-2e0d226e89e7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/47/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:43.179Z","lastSeenAt":"2026-04-28T07:04:58.012Z"}],"details":{"listingId":"ec545578-f5c0-44e2-a775-2e0d226e89e7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/47/balance \\\n  -H \"X-PAYMENT: <valid_x402_payment_proof>\" \\\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/47/balance"},{"claim":"Platform advertises $0.02 per request pricing 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/47/balance"}],"useCases":["Retrieving account balance data without traditional API key registration","Programmatic balance checks settled instantly via USDC on Base","Agent-driven financial data retrieval with per-call payment"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed documentation or OpenAPI specs before integration","High-volume consumers who would benefit from bulk/subscription pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:38.149Z"},"updatedAt":"2026-04-28T07:04:58.012Z"}}