{"id":"5e380ab2-c6ef-40d1-82b3-5166a404df49","shortId":"ZvNKNb","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/16/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\nHowever, the specific endpoint being listed here — `/api/v1/accounts/16/balance` — is not among the publicly documented API categories on the landing page. Its exact response schema and purpose are unclear beyond the generic \"Premium API Access\" label. Documentation pages (/docs, /pricing, /README) returned only a wallet-connect prompt with no substantive content. Without an OpenAPI spec or response examples, the actual data returned by this endpoint cannot be confirmed.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-call","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 API","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee","402 payment endpoint"],"warnings":["The endpoint /api/v1/accounts/16/balance is not listed among the platform's publicly advertised APIs — its purpose is unclear.","All documentation pages (/docs, /pricing, /README, /api) returned only a wallet-connect prompt with no substantive content.","No OpenAPI spec or response schema is available; the actual response format is unknown.","The endpoint path includes a hardcoded account ID (16), suggesting it may be specific to a single account rather than a general-purpose API."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/16/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/16/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 (returns a valid 402 x402 challenge), but there is no OpenAPI spec, no response schema, no documentation beyond a wallet-connect stub, and the specific endpoint path (/api/v1/accounts/16/balance) is not listed among the platform's advertised APIs. The purpose and output of this endpoint are essentially 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'/docs':178 '/pricing':179 '/readme':180 '0.02':73,126 '000':77 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':67 '20':76 '402 payment endpoint' '6':81 'Base network API' 'USDC micropayment API' 'accept':54 'access':52,174 'account':4,18,35 'account balance API' 'account-balance' 'actual':200 'advertis':87 'ai/ml':98 'among':151 'analysi':100 'analyt':97 'api':51,94,131,155,173 'balanc':5,19,36 'base':8,22,62,78 'base-network' 'beyond':169 'broader':84 'call':12,26 'cannot':206 'categori':156 'classif':102 'commit':139 'confirm':208 'connect':186 'content':191 'contract':66 'convers':119 'cost':71 'data':96,201 'decim':82 'describ':48 'document':154,176 'embed':103 'endpoint':6,20,30,122,144,205 'estim':113 'exact':162 'exampl':198 'exchang':108 'feed':107 'financ':104 'gas':112 'gate':3,17,93 'generat':120 'generic':171 'geocod':117 'howev':141 'infrastructur':115 'key':132 'label':175 'land':159 'limit':135 'list':124,146 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,85 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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":"The x402 challenge returns maxAmountRequired of 20000 in USDC (6 decimals) on Base, equaling $0.02 per request.","source_url":"https://lowpaymentfee.com/api/v1/accounts/16/balance"},{"claim":"The 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":"The platform lists APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /README) returned only a wallet-connect prompt.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying account balance data via a single paid API call","Integrating pay-per-use balance lookups into agent workflows","Demonstrating x402 protocol payment flows on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing no-auth, pay-per-call API access on Base","Low-volume, on-demand account balance queries"],"notFor":["High-volume balance monitoring requiring subscription pricing","Users who need detailed API documentation and response schemas before integrating","Production systems requiring guaranteed SLAs and support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:39.292Z"},"updatedAt":"2026-04-28T10:33:11.218Z"}}