{"id":"0f15b6dc-5c43-4e48-8dd3-c82af790bff3","shortId":"E4F7y6","kind":"x402","title":"Check account balance via x402 micropayment on Base network for $0.02 per request.","tagline":"Check account balance via x402 micropayment on Base network for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns account balance information for a specific account (account ID 29) behind an x402 paywall. It is part of a broader platform offering dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/accounts/29/balance` accepts POST requests and requires an X-PAYMENT header conforming to the x402 protocol (version 1, \"exact\" scheme). Payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) is sent to the payTo address on Base. No API keys, rate limits, or upfront commitments are required — callers simply attach a valid payment header to each request.\n\nDocumentation on the site is extremely sparse: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples. The endpoint is confirmed live (returns a proper 402 challenge), but the actual response payload structure for a successful call is unknown.","tags":[],"capabilities":["x402-payment","account-balance","usdc-base","pay-per-call","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 balance check","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto payment API"],"warnings":["No OpenAPI or schema documentation available — response format is unknown","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","The specific endpoint path (/api/v1/accounts/29/balance) is not listed among the site's advertised APIs, raising questions about its intended use","No examples of successful responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/29/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/29/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge, but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the purpose of 'account 29 balance' is entirely opaque. The listing is effectively a 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'0.02':11,24,75,119 '000':114 '1':106 '20':113 '29':41 '402':201 '6':124 'Base network API' 'USDC pay-per-call' 'accept':90 'account':2,15,32,38,39 'account balance API' 'account-balance' 'actual':205 'address':131 'ai/ml':65 'analyt':64 'api':60,135,163 'attach':146 'balanc':3,16,33 'base':8,21,84,115,133 'behind':42 'broader':51 'call':59,212 'caller':144 'challeng':202 'check':1,14 'commit':141 'confirm':196 'conform':100 'connect':172 'crypto payment API' 'data':63,68 'decim':125 'detail':179 'doc':162 'document':154,188 'dozen':54 'endpoint':28,61,88,194 'exact':107 'exampl':192 'extrem':159 'finance/web3':67 'header':99,150 'id':40 'infer':66 'inform':34 'infrastructur':70 'key':136 'limit':138 'live':197 'lowpaymentfee' 'lowpaymentfee.com':30 'micropay':6,19 'micropayment API' 'network':9,22,85 'no-api-key' 'offer':53 'openapi':183 'page':167 'part':48 'pay':57 'pay-per-cal':56 'pay-per-call' 'payload':207 'payment':98,109,149 'payto':130 'paywal':45 'per':12,25,58,76 'platform':52 'post':91 'price':73,164 'prompt':174 'proper':200 'protocol':104 'rate':137 'readm':166 'render':169 'request':13,26,77,92,153 'request/response':186 'requir':94,143 'respons':206 'return':31,198 'schema':187 'scheme':108 'sent':127 'settl':79 'simpli':145 'sinc':121 'site':157 'span':62 'spars':160 'spec':184 'specif':37,87 'structur':208 'success':211 'technic':178 'unit':116 'unknown':214 'upfront':140 'usag':191 'usd':120 'usdc':81,118,122 'usdc-base' 'use':123 'util':71 'valid':148 'version':105 'via':4,17 'wallet':173 'x':97 'x-payment':96 'x402':5,18,44,103 'x402 balance check' 'x402-payment'","prices":[{"id":"0b8de08d-1d27-443e-93d5-48e9e7dfae81","listingId":"0f15b6dc-5c43-4e48-8dd3-c82af790bff3","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/29/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":"2026-04-18T18:39:28.146Z"}],"sources":[{"listingId":"0f15b6dc-5c43-4e48-8dd3-c82af790bff3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/29/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:28.146Z","lastSeenAt":"2026-04-28T08:04:42.366Z"}],"details":{"listingId":"0f15b6dc-5c43-4e48-8dd3-c82af790bff3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/29/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":"Endpoint returns 402 with x402 version 1 challenge, exact scheme, on Base network, asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (USDC)","source_url":"https://lowpaymentfee.com/api/v1/accounts/29/balance"},{"claim":"maxAmountRequired is 20000 base units (0.02 USDC at 6 decimals)","source_url":"https://lowpaymentfee.com/api/v1/accounts/29/balance"},{"claim":"Site advertises $0.02/request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance data programmatically with per-call USDC micropayments","Integrating balance lookups into agent workflows without managing API keys","Demonstrating x402 protocol payment flows on Base network"],"bestFor":["Developers experimenting with x402 protocol micropayments","Agents needing keyless, pay-per-call balance queries","Projects already operating on the Base L2 network with USDC"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume balance queries where per-call pricing adds up quickly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:38.817Z"},"updatedAt":"2026-04-28T08:04:42.366Z"}}