{"id":"05a8f6de-7a81-4924-bfc1-099bc6ef7c4d","shortId":"Am2LAn","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 an account balance lookup via the x402 payment protocol. The specific resource `/api/v1/accounts/34/balance` is described as \"Premium API Access\" and accepts POST requests. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum cost of $0.02 per request (20,000 base units at 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises a suite of x402-gated APIs spanning data & analytics, AI/ML (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 with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the `/accounts/34/balance` endpoint actually returns. The endpoint is confirmed live (returns a valid x402 402 challenge), but the lack of documentation makes it difficult to determine the exact request format or response structure.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-call","no-api-key"],"categories":["finance","data"],"synonyms":["account balance API","x402 API","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee"],"warnings":["No documentation available — docs, API, pricing, and README pages all render only 'Connect wallet'","No OpenAPI or request/response schema provided","The specific endpoint /api/v1/accounts/34/balance has a hardcoded account ID (34); unclear if this is parameterizable","Purpose and response format of the balance endpoint are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/34/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/34/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 x402 402 challenge, but documentation is essentially nonexistent — all doc/pricing/API pages show only 'Connect wallet'. No OpenAPI schema, no request/response examples, and the purpose of the specific /accounts/34/balance resource is unclear. The listing is effectively a 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'/api/v1/accounts/34/balance':46 '0.02':73,126 '000':77 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':67 '20':76 '402':191 '6':81 'Base network API' 'USDC micropayment API' 'accept':54 'access':52 'account':4,18,35 'account balance API' 'account-balance' 'actual':180 'advertis':87 'ai/ml':98 'analysi':100 'analyt':97 'api':51,94,131,147 'balanc':5,19,36 'base':8,22,62,78 'base-network' 'broader':84 'call':12,26 'challeng':192 'classif':102 'commit':139 'confirm':185 'connect':156 'content':162 'contract':66 'convers':119 'cost':71 'data':96 'decim':82 'describ':48 'descript':174 'detail':173 'determin':202 'difficult':200 'doc':146 'document':141,197 'embed':103 'endpoint':6,20,30,122,179,183 'estim':113 'exact':204 'exampl':170 'exchang':108 'extrem':143 'feed':107 'financ':104 'format':206 'gas':112 'gate':3,17,93 'generat':120 'geocod':117 'infrastructur':115 'key':132 'lack':195 'limit':135 'list':124 'live':186 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,85 'make':198 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application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 402 challenge with USDC on Base network, maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/accounts/34/balance"},{"claim":"All endpoints listed at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/34/balance"}],"useCases":["Querying account balance data via a single paid API call","Integrating pay-per-call balance lookups into agent workflows","Accessing premium data without API key registration"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Use cases requiring no-signup, pay-per-call API access","Low-volume or sporadic balance queries where subscription pricing is wasteful"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume consumers who would benefit from bulk or subscription pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:38.614Z"},"updatedAt":"2026-04-29T05:33:52.937Z"}}