{"id":"9848bca8-e6e9-4911-b505-72b45881169b","shortId":"Ja8qpQ","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 17) via an x402-gated POST request. Payment is settled in USDC on the Base network at $0.02 per call (20,000 base units with 6 decimals). No API keys or rate limits are required — access is granted purely through the x402 payment protocol.\n\nThe provider lowpaymentfee.com hosts a broader suite of pay-per-call APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request and settle on the Base network using USDC.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what fields the balance response contains or what input parameters the POST body expects. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the actual functionality and response format must be discovered experimentally.","tags":[],"capabilities":["x402-payment","usdc-base-network","account-balance","pay-per-request","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["account balance API","x402 balance check","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto payment API"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request body or response format","The specific purpose of the /accounts/17/balance endpoint is unclear — it may be a demo or placeholder","No request or response examples could be sourced"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/17/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/17/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 x402 challenge, but there is no OpenAPI schema, no request/response examples, and all documentation pages render only a wallet-connect prompt. The actual functionality, input parameters, and response format are entirely unknown. This is effectively a stub 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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/17/balance","description":"Premium API 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<x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge advertising USDC on Base at maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/accounts/17/balance"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Provider offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying account balance data without needing API key registration","Agent-driven balance lookups settled instantly via USDC micropayments","Integrating pay-per-call balance checks into automated workflows"],"bestFor":["Developers wanting zero-signup API access via crypto micropayments","AI agents that can settle x402 payments autonomously on Base","Quick one-off balance queries without subscription commitments"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may add up compared to subscription plans","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:39.249Z"},"updatedAt":"2026-04-29T06:33:41.945Z"}}