{"id":"509e274d-241a-4650-b5ec-87fd235bd3e5","shortId":"6C9bRX","kind":"x402","title":"x402-gated account balance endpoint on Base, paid per-request in USDC.","tagline":"x402-gated account balance endpoint on Base, paid per-request in USDC.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" account balance lookup via the x402 payment protocol. The specific resource `/api/v1/accounts/68/balance` is gated behind a per-call USDC payment on the Base network. The x402 challenge confirms the endpoint is live, accepting POST requests and returning application/json responses.\n\nThe parent site lowpaymentfee.com hosts a broader catalog 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. Payment settles in USDC on the Base L2 network.\n\nFor this specific endpoint, the x402 challenge advertises a maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which uses 6 decimals), equating to $0.02 per call. The endpoint uses the \"exact\" payment scheme with a 300-second timeout. No OpenAPI schema, detailed documentation, or example responses were found beyond the x402 challenge metadata and the landing page listing.","tags":[],"capabilities":["x402-payment","usdc-base","account-balance","per-request-billing","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","balance lookup"],"warnings":["No OpenAPI or detailed documentation available — endpoint behavior must be inferred from the x402 challenge metadata alone.","The specific meaning of 'accounts/68/balance' is undocumented; it is unclear what account ID 68 refers to or what the response contains.","Docs, API, pricing, and README pages all returned only a 'Connect wallet' prompt with no substantive content.","The broader site lists many endpoints but none have documented schemas or example payloads."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/68/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/68/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 (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no documentation beyond a landing page, no example request/response bodies, and the specific purpose of the /accounts/68/balance resource is unclear. This is effectively a stub 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'0.02':122,169 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':162 '20000':156 '300':181 '6':165 'Base network API' 'USDC micropayment API' 'accept':71 'access':37 'account':4,18,38 'account balance API' 'account-balance' 'advertis':152 'ai/ml':94 'analysi':96 'analyt':93 'api':36,90,127 'application/json':76 'asset':161 'balanc':5,19,39 'balance lookup' 'base':8,22,61,142,157 'behind':52 'beyond':194 'broader':84 'call':56,171 'catalog':85 'challeng':65,151,197 'classif':98 'commit':135 'confirm':66 'convers':115 'data':92 'decim':166 'detail':187 'document':188 'embed':99 'endpoint':6,20,30,68,118,148,173 'equat':167 'estim':109 'exact':176 'exampl':190 'exchang':104 'feed':103 'financ':100 'found':193 'gas':108 'gate':3,17,51,89 'generat':116 'geocod':113 'host':82 'infrastructur':111 'json-response' 'key':128 'l2':143 'land':201 'limit':131 'list':120,203 'live':70 'lookup':40 'lowpaymentfee' 'lowpaymentfee.com':32,81 'maxamountrequir':154 'metadata':198 'minimum':134 'network':62,144 'no-api-key' 'openapi':185 'page':202 'paid':9,23 'parent':79 'pay-per-call API' 'payment':44,58,136,177 'per':11,25,55,123,170 'per-cal':54 'per-request':10,24 'per-request-billing' 'post':72 'premium':35 'price':102 'protocol':45 'provid':33 'quot':107 'rate':105,130 'request':12,26,73,124 'resourc':48 'respons':77,191 'return':75 'schema':186 'scheme':178 'second':182 'sentiment':95 'settl':137 'site':80 'span':91 'specif':47,147 'summar':97 'timeout':183 'token':106 'unit':158 'usdc':14,28,57,139,160 'usdc-base' 'use':164,174 'util':112 'valid':114 'via':41 'web3':101 'x402':2,16,43,64,88,150,196 'x402 paid endpoint' 'x402-gated':1,15,87 'x402-payment'","prices":[{"id":"34dcbe46-5ba1-4555-bf44-140663bf7aa0","listingId":"509e274d-241a-4650-b5ec-87fd235bd3e5","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/68/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":"2026-04-18T18:40:00.111Z"}],"sources":[{"listingId":"509e274d-241a-4650-b5ec-87fd235bd3e5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/68/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:00.111Z","lastSeenAt":"2026-04-28T05:33:51.434Z"}],"details":{"listingId":"509e274d-241a-4650-b5ec-87fd235bd3e5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/68/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 x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network with exact scheme and 300s timeout.","source_url":"https://lowpaymentfee.com/api/v1/accounts/68/balance"},{"claim":"All endpoints on the site are listed at $0.02 per request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The site hosts APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance data behind a micropayment wall","Integrating pay-per-call balance checks into agent workflows","Demonstrating x402 protocol payment flows on Base"],"bestFor":["Agents or services that need on-demand account balance data without subscription commitments","Developers experimenting with x402 micropayment-gated APIs","Automated workflows requiring low-cost, keyless API access"],"notFor":["High-volume balance polling where per-request costs would accumulate significantly","Users who need detailed API documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:37.368Z"},"updatedAt":"2026-04-28T05:33:51.434Z"}}