{"id":"6aa1651d-af1a-47f6-babd-ca6f058ee162","shortId":"f8bLvD","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\" account balance resource at `/api/v1/accounts/54/balance`. It is part of a broader platform offering dozens of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated via the x402 payment protocol on the Base network.\n\nThe specific endpoint probed returns an x402 challenge requesting payment in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base) with a `maxAmountRequired` of 20,000 base units. Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the platform's advertised flat pricing of $0.02/request across all endpoints. Payment is made via the `exact` scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\n\nThe platform advertises no API keys, no rate limits, and instant access. However, documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all resolve to a minimal \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no documentation explaining what the account balance endpoint actually returns or what input parameters it expects. The exact purpose of \"account 54 balance\" is unclear — it may be a demo or placeholder resource.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","account-balance","json-response","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","crypto payment API"],"warnings":["No documentation available — all doc pages (/docs, /pricing, /api, /README) show only 'Connect wallet'","No OpenAPI or request/response schema provided","The specific endpoint '/api/v1/accounts/54/balance' purpose is unclear — may be a demo or placeholder","No examples of expected input or output format"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/54/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/54/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of the specific '/accounts/54/balance' resource is unexplained. All doc pages return only 'Connect wallet' with no 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'/api/v1/accounts/54/balance':42 '/docs':167 '/pricing':168 '/readme':170 '/request':125 '0.02':112,124 '000':101 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':138 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':93 '20':100 '300':141 '54':213 '6':107 'Base network API' 'USDC micropayment API' 'accept':146 'access':37,163 'account':4,18,38,197,212 'account balance API' 'account-balance' 'across':126 'actual':200 'address':137 'advertis':120,154 'ai/ml':62 'analyt':61 'api':36,57,156 'application/json':151 'balanc':5,19,39,198,214 'base':8,22,78,95,102 'broader':48 'call':12,26 'challeng':87 'connect':176 'consist':115 'content':182 'contract':92 'crypto payment API' 'data':60,65 'decim':108 'demo':221 'document':165,193 'dozen':51 'endpoint':6,20,30,58,82,128,145,199 'exact':134,209 'exampl':190 'expect':207 'explain':194 'finance/web3':64 'flat':121 'gate':3,17,70 'howev':164 'infer':63 'infrastructur':67 'input':204 'instant':162 'json-response' 'key':157 'limit':160 'lowpaymentfee' 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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/54/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":"2026-04-18T18:39:49.276Z"}],"sources":[{"listingId":"6aa1651d-af1a-47f6-babd-ca6f058ee162","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/54/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:49.276Z","lastSeenAt":"2026-04-28T06:33:39.808Z"}],"details":{"listingId":"6aa1651d-af1a-47f6-babd-ca6f058ee162","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/54/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":"Platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base (= $0.02)","source_url":"https://lowpaymentfee.com/api/v1/accounts/54/balance"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/54/balance"},{"claim":"Platform offers endpoints across data analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance data via a single paid API call","Demonstrating x402 payment protocol integration on Base","Agent-driven pay-per-request data retrieval without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-call API access on Base","Projects requiring USDC-settled micropayment endpoints"],"notFor":["Production use cases requiring documented request/response schemas","Users needing free or subscription-based API access","Applications requiring high-throughput with predictable billing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:37.878Z"},"updatedAt":"2026-04-28T06:33:39.808Z"}}