{"id":"de678793-1398-4723-8135-be6996760ab2","shortId":"aJPjtB","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 a \"Premium API Access\" account balance resource gated behind the x402 payment protocol. When called without payment, it returns a 402 challenge requesting USDC on the Base network. The specific endpoint `/api/v1/accounts/4/balance` appears to return account balance information in JSON format, accessible via HTTP POST with an x402 payment header.\n\nThe parent site lowpaymentfee.com hosts a broader suite of pay-per-request APIs spanning data & analytics, AI & machine learning (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. This specific endpoint's x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (which has 6 decimals), equating to $0.02 per call — consistent with the site's stated pricing.\n\nPayment settles on the Base L2 network to the USDC contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913. No API keys or rate limits are advertised. Documentation pages (/docs, /pricing, /README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual response schema and detailed behavior of this balance endpoint remain undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","account-balance","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 API","USDC payment API","Base network API","pay-per-call API","lowpaymentfee","crypto payment endpoint"],"warnings":["No API documentation available — /docs, /pricing, and /README pages all return only 'Connect wallet' with no content","Response schema for this endpoint is completely undocumented; actual returned data structure is unknown","The endpoint path includes a hardcoded account ID (4), suggesting it may be a demo or placeholder rather than a general-purpose API","The broader site lists many API categories (AI, finance, analytics, etc.) but none of the documentation pages have real content, raising questions about whether these endpoints are fully implemented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/4/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/4/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documented request/response format, and all documentation pages are empty stubs ('Connect wallet'). The purpose of the specific /accounts/4/balance endpoint is unclear beyond its name. This is effectively a stub 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'/docs':189 '/pricing':190 '/readme':191 '0.02':131,156 '000':145 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':178 '20':144 '402':54 '6':152 'Base network API' 'USDC payment API' 'access':37,75 'account':4,18,38,69 'account balance API' 'account-balance' 'actual':204 'advertis':140,186 'ai':101 'analysi':105 'analyt':100 'api':36,97,180 'appear':66 'balanc':5,19,39,70,212 'base':8,22,60,146,170 'behavior':209 'behind':42 'broader':90 'call':12,26,48,158 'challeng':55,139 'classif':107 'connect':195 'consist':159 'content':201 'contract':176 'convers':124 'crypto payment endpoint' 'data':99 'decim':153 'detail':208 'document':187 'embed':108 'endpoint':6,20,30,64,127,136,213 'equat':154 'estim':118 'exchang':113 'feed':112 'financ':109 'format':74 'gas':117 'gate':3,17,41 'generat':125 'geocod':122 'header':83 'host':88 'http':77 'inform':71 'infrastructur':120 'json':73 'json-response' 'key':181 'l2':171 'learn':103 'limit':184 'list':129 'lowpaymentfee' 'lowpaymentfee.com':32,87 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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/4/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":"2026-04-18T18:39:37.176Z"}],"sources":[{"listingId":"de678793-1398-4723-8135-be6996760ab2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/4/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:37.176Z","lastSeenAt":"2026-04-30T08:34:13.907Z"}],"details":{"listingId":"de678793-1398-4723-8135-be6996760ab2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/4/balance \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge requests 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/4/balance"},{"claim":"All endpoints are listed at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The site advertises APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /README) contain only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying account balance data via a single paid API call","Demonstrating x402 payment protocol integration for agents","Programmatic access to balance information without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that can settle micropayments in USDC on Base","Use cases requiring keyless, pay-per-request API access"],"notFor":["Users needing detailed API documentation or response schemas before integrating","High-volume use cases where $0.02/request adds up significantly","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:38.411Z"},"updatedAt":"2026-04-30T08:34:13.907Z"}}