{"id":"63eaa0e3-8fcd-4048-8272-819bd82614d9","shortId":"dG3Qd3","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 181) behind an x402 paywall. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 \"exact\" scheme. The maximum amount required per call is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-request 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. However, the specific endpoint being listed here (/api/v1/accounts/181/balance) is not among those advertised on the landing page, and its exact response schema is undocumented.\n\nThe probe confirmed the endpoint is live, returning a proper 402 challenge with x402 version 1. Documentation pages (/docs, /pricing, /api, /README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response format for this endpoint remains unknown beyond what the x402 challenge reveals (POST, application/json output).","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-request","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","USDC micropayment API","x402 balance check","pay-per-call API","Base network API","lowpaymentfee"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all return only 'Connect wallet' with no content","The endpoint /api/v1/accounts/181/balance is not listed among the platform's advertised API endpoints","Request body schema and response schema are completely unknown","Purpose of 'account 181 balance' is unclear — could be a demo or placeholder endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/181/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/181/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, but there is no documentation for the request body, response schema, or what 'account 181 balance' actually represents. The docs, pricing, API, and README pages are all empty beyond a wallet connect prompt. The specific endpoint path is not listed among the platform's advertised 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'/api/v1/accounts/181/balance':154 '/docs':189 '/pricing':190 '/readme':192 '0.02':84,133 '000':77 '0x8335':62 '1':186 '181':40 '20':76 '2913':63 '402':181 '6':87 'Base network API' 'USDC micropayment API' 'accept':46 'account':4,18,35,38 'account balance API' 'account-balance' 'actual':206 'advertis':93,159 'ai/ml':105 'among':157 'amount':71 'analysi':107 'analyt':104 'api':101,138 'application/json':221 'balanc':5,19,36 'base':8,22,57,78 'base-network' 'behind':41 'beyond':214 'broader':90 'call':12,26,74 'challeng':182,218 'classif':109 'commit':146 'confirm':173 'connect':197 'content':203 'contract':61 'convers':126 'data':103 'decim':88 'document':187 'embed':110 'endpoint':6,20,30,129,150,175,211 'equal':83 'estim':120 'exact':67,166 'exchang':115 'feed':114 'financ':111 'format':208 'gas':119 'gate':3,17 'generat':127 'geocod':124 'howev':147 'id':39 'infrastructur':122 'json':51 'key':139 'land':162 'limit':142 'list':131,152 'live':177 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,91 'maximum':70 'minimum':145 'network':58 'no-api-key' 'output':222 'page':163,188 'pay':10,24,98 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request':97 'payment':52 'paywal':44 'per':11,25,73,99,134 'platform':92 'post':47,220 'price':113 'probe':172 'prompt':199 'proper':180 'provid':33 'quot':118 'rate':116,141 'remain':212 'request':48,100,135 'request/response':207 'requir':72 'respons':167 'return':50,178,194 'reveal':219 'schema':168 'scheme':68 'sentiment':106 'settl':54 'span':102 'specif':149 'substant':202 'suit':95 'summar':108 'token':117 'undocu':170 'unit':79 'unknown':213 'usdc':14,28,60,81,85 'usdc-settlement' 'use':59,86 'util':123 'valid':125 'version':185 'via':64 'wallet':198 'web3':112 'x402':2,16,43,66,184,217 'x402 balance check' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"e1e30413-d701-4015-85e1-b0883c3bf215","listingId":"63eaa0e3-8fcd-4048-8272-819bd82614d9","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/181/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":"2026-04-18T18:41:32.516Z"}],"sources":[{"listingId":"63eaa0e3-8fcd-4048-8272-819bd82614d9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/181/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:32.516Z","lastSeenAt":"2026-04-27T18:07:21.423Z"}],"details":{"listingId":"63eaa0e3-8fcd-4048-8272-819bd82614d9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/181/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 x402 version 1, exact scheme, on Base network using USDC","source_url":"https://lowpaymentfee.com/api/v1/accounts/181/balance"},{"claim":"maxAmountRequired is 20000 base units of USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/accounts/181/balance"},{"claim":"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":"Documentation pages (/docs, /pricing, /api, /README) contain only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying account balance information for account 181 via a single paid API call","Demonstrating x402 payment protocol integration with USDC on Base","Agent-driven balance lookups without pre-registration or API keys"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-call balance queries","Projects already using USDC on Base network"],"notFor":["Production use requiring documented request/response schemas","Bulk or high-volume balance queries where per-call fees add up","Users who need detailed API documentation before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:32.877Z"},"updatedAt":"2026-04-27T18:07:21.423Z"}}