{"id":"e592dd77-e99b-4f9e-b56e-c69b0778ab98","shortId":"Fw3zJN","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 (account ID 195) behind an x402 paywall. It is part of a broader platform that advertises multiple API categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all gated via the x402 protocol on the Base network.\n\nThe specific endpoint `/api/v1/accounts/195/balance` accepts POST requests and returns JSON. Payment is settled in USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The platform advertises a flat $0.02 per request across all its endpoints, with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the balance endpoint actually returns. The endpoint is confirmed live via a valid 402 challenge, but the lack of documentation makes it difficult to know what data to send or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-call","json-api"],"categories":["finance"],"synonyms":["account balance API","x402 balance check","USDC pay-per-call","lowpaymentfee API","Base network API","crypto-gated API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages are all empty stubs","No OpenAPI or request/response schema provided","Purpose of 'account 195 balance' is unclear — may be a demo or placeholder","No SLA, rate limit, or uptime guarantees documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/195/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/195/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 402 challenge, confirming it exists and accepts payment. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs showing only 'Connect wallet'. The purpose of this specific endpoint (account 195 balance) is unclear, and there is no way to know what the response looks like without 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'/api/v1/accounts/195/balance':81 '/docs':142 '/pricing':143 '/readme':146 '0.02':108,118 '000':103 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':96 '195':40 '20':102 '402':186 '6':111 'Base network API' 'USDC pay-per-call' 'accept':82 'account':4,18,35,38 'account balance API' 'account-balance' 'across':121 'actual':176 'advertis':53,115 'ai':60 'amount':100 'analyt':59 'api':55,127 'balanc':5,19,36,174 'base':8,22,76,94,104 'base-network' 'behind':41 'broader':50 'call':12,26 'categori':56 'challeng':187 'commit':135 'confirm':181 'connect':152 'content':158 'contract':95 'crypto-gated API' 'data':58,199 'decim':112 'descript':170 'detail':169 'difficult':195 'document':137,192 'endpoint':6,20,30,80,124,175,179 'equal':107 'exampl':166 'expect':206 'extrem':139 'financ':63 'flat':117 'gate':3,17,69 'id':39 'includ':57 'infrastructur':66 'json':87 'json-api' 'key':128 'know':197 'lack':190 'learn':62 'limit':131 'live':182 'lookup':37 'lowpaymentfee API' 'lowpaymentfee.com':32 'machin':61 'make':193 'maximum':99 'minimum':134 'multipl':54 'network':77 'openapi':162 'page':147 'part':47 'pay':10,24 'pay-per-cal':9,23 'pay-per-call' 'payment':88 'paywal':44 'per':11,25,119 'platform':51,114 'post':83 'prompt':154 'protocol':73 'provid':33 'rate':130 'render':149 'request':84,120 'request/response':165 'requir':136 'respons':204 'return':86,177 'schema':163 'send':201 'settl':90 'spars':140 'specif':79 'substant':157 'unit':105 'usdc':14,28,92,109 'usdc-settlement' 'use':110 'util':67 'valid':185 'via':70,183 'wallet':153 'web3':64 'x402':2,16,43,72 'x402 balance check' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"7d3a760d-c4cb-4b79-af18-f8fc502784b5","listingId":"e592dd77-e99b-4f9e-b56e-c69b0778ab98","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/195/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":"2026-04-18T18:41:43.404Z"}],"sources":[{"listingId":"e592dd77-e99b-4f9e-b56e-c69b0778ab98","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/195/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:43.404Z","lastSeenAt":"2026-04-30T10:06:20.431Z"}],"details":{"listingId":"e592dd77-e99b-4f9e-b56e-c69b0778ab98","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/195/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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/195/balance"},{"claim":"The platform advertises $0.02 per request across all endpoints 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/195/balance"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying account balance information for account 195 via a single paid API call","Demonstrating x402 protocol integration for pay-per-request APIs","Agent-driven balance lookups without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-call API access on Base","Quick one-off account balance queries"],"notFor":["Production use requiring documented request/response schemas","High-volume balance monitoring (no documented rate limits but no SLA either)","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:32.365Z"},"updatedAt":"2026-04-30T10:06:20.431Z"}}