{"id":"f066c434-f074-4279-b978-e5d3c347b1d6","shortId":"TF9uKb","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/61/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 (metrics, reports, data export, insights), AI & machine learning (sentiment analysis, text 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.\n\nHowever, the specific endpoint being listed here — `/api/v1/accounts/61/balance` — does not appear in the platform's published API catalog. Its exact response format and purpose are unclear beyond the generic \"Premium API Access\" label. No OpenAPI schema, detailed documentation, or example responses were found during the crawl (docs, pricing, and API pages all returned only a \"Connect wallet\" prompt). The endpoint is confirmed live via a valid 402 challenge.","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"],"warnings":["The endpoint /api/v1/accounts/61/balance is not listed in the platform's published API catalog — its purpose and response schema are unknown.","No documentation, OpenAPI spec, or example responses are available; all doc pages returned only 'Connect wallet'.","The endpoint description 'Premium API Access' is generic and does not describe what data is returned.","The platform lists many API categories (AI, finance, analytics, etc.) but none could be verified for actual functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/61/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/61/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 (valid 402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation, no example responses, and the specific endpoint path does not appear in the site's own catalog. The docs/pricing/API pages all returned only a wallet-connect prompt with no useful 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'0.02':73,134 '000':77 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':67 '20':76 '402':214 '6':81 'Base network API' 'USDC micropayment API' 'accept':54 'access':52,179 'account':4,18,35 'account balance API' 'account-balance' 'advertis':87 'ai':103 'analysi':107 'analyt':97 'api':51,94,139,164,178,197 'appear':158 'balanc':5,19,36 'base':8,22,62,78 'base-network' 'beyond':174 'broader':84 'call':12,26 'catalog':165 'challeng':215 'classif':110 'commit':147 'confirm':209 'connect':203 'contract':66 'convers':127 'cost':71 'crawl':193 'data':96,100 'decim':82 'describ':48 'detail':184 'doc':194 'document':185 'embed':111 'endpoint':6,20,30,130,151,207 'estim':121 'exact':167 'exampl':187 'exchang':116 'export':101 'feed':115 'financ':112 'format':169 'found':190 'gas':120 'gate':3,17,93 'generat':128 'generic':176 'geocod':125 'howev':148 'infrastructur':123 'insight':102 'key':140 'label':180 'learn':105 'limit':143 'list':132,153 'live':210 'lookup':37 'lowpaymentfee' 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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/61/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":"2026-04-18T18:39:55.251Z"}],"sources":[{"listingId":"f066c434-f074-4279-b978-e5d3c347b1d6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/61/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:55.251Z","lastSeenAt":"2026-04-28T05:33:51.198Z"}],"details":{"listingId":"f066c434-f074-4279-b978-e5d3c347b1d6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/61/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 endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/61/balance"},{"claim":"The platform lists APIs at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/61/balance"}],"useCases":["Querying account balance data via a single paid API call","Integrating pay-per-use balance lookups into agent workflows","Accessing premium data without API key registration"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Developers wanting zero-signup, pay-per-call API access","Automated workflows needing on-demand account balance checks"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-call pricing may add up without bulk discounts","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:37.594Z"},"updatedAt":"2026-04-28T05:33:51.198Z"}}