{"id":"37cd68f2-7d21-4051-b852-249bfd2d50e9","shortId":"Vzu34A","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 (ID 161) via the x402 payment protocol. It is part of a broader platform offering data & analytics, AI/ML inference, finance/Web3, and infrastructure utility APIs, all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe endpoint accepts POST requests and requires an X-PAYMENT header containing a valid x402 payment proof. The x402 challenge confirms the endpoint is live, advertising a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe platform advertises no API keys, no rate limits, and instant access. However, documentation beyond the landing page is extremely thin — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawl. The specific functionality of the /accounts/161/balance endpoint is not documented beyond its title \"Premium API Access,\" making it unclear what fields the response contains or what input parameters (if any) the POST body expects.","tags":[],"capabilities":["x402-payment","usdc-base","account-balance","micropayment","pay-per-request"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 balance check","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — request body and response format are unknown","All documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt with no content","The endpoint path includes a hardcoded account ID (161); it is unclear if this is parameterizable or fixed","The description 'Premium API Access' is generic and does not explain what data is returned"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/161/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/161/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no examples, and the docs pages are empty stubs. The specific purpose of the /accounts/161/balance endpoint is undocumented beyond its generic 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'/api':159 '/docs':158 '/pricing':160 '/readme':162 '0.02':11,24,66,119 '000':108 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':130 '0x8335':113 '161':40 '20':107 '2913':114 '300':133 '6':123 'Base network API' 'USDC micropayment API' 'accept':79 'access':147,207 'account':2,15,32,38 'account balance API' 'account-balance' 'addit':173 'address':129 'advertis':103,138 'ai/ml':56 'analyt':55 'api':62,140,206 'avail':188 'balanc':3,16,33 'base':8,21,75,109,116 'beyond':150,202 'bodi':224 'broader':51 'challeng':97 'check':1,14 'confirm':98 'connect':168 'contain':89,215 'crawl':191 'data':54 'decim':124 'detail':175 'document':149,201 'endpoint':28,78,100,198 'equal':118 'exampl':187 'expect':225 'extrem':155 'field':212 'finance/web3':58 'function':194 'given':120 'header':88 'howev':148 'id':39 'infer':57 'inform':34 'infrastructur':60 'input':218 'instant':146 'key':141 'land':152 'limit':144 'live':102 'lowpaymentfee' 'lowpaymentfee.com':30 'make':208 'maxamountrequir':105 'micropay':6,19 'micropayment' 'network':9,22,76 'offer':53 'openapi':179 'page':153,163 'paramet':219 'part':48 'pay-per-call API' 'pay-per-request' 'payment':44,87,93,125 'per':12,25,67 'platform':52,137 'post':80,223 'premium':205 'price':64 'prompt':170 'proof':94 'protocol':45 'rate':143 'render':165 'request':13,26,68,81 'request/response':182 'requir':83 'respons':214 'return':31 'schema':183 'second':134 'sent':127 'settl':70 'spec':180 'specif':37,193 'technic':174 'thin':156 'timeout':135 'titl':204 'unclear':210 'unit':110 'usag':186 'usdc':72,112,121 'usdc-base' 'util':61 'valid':91 'via':4,17,41 'wallet':169 'x':86 'x-payment':85 'x402':5,18,43,92,96 'x402 balance check' 'x402-payment'","prices":[{"id":"32da0c4f-44a9-42a9-8624-16fec60c7724","listingId":"37cd68f2-7d21-4051-b852-249bfd2d50e9","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/161/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":"2026-04-18T18:41:19.330Z"}],"sources":[{"listingId":"37cd68f2-7d21-4051-b852-249bfd2d50e9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/161/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:19.330Z","lastSeenAt":"2026-04-27T19:33:55.247Z"}],"details":{"listingId":"37cd68f2-7d21-4051-b852-249bfd2d50e9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/161/balance \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\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 HTTP 402 with x402 challenge advertising maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/161/balance"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/161/balance"}],"useCases":["Querying account balance data with per-request USDC micropayments","Integrating pay-per-use balance lookups into agent workflows","Accessing financial account information without API key registration"],"bestFor":["Agents that need on-demand account balance data without subscription commitments","Developers testing x402 payment protocol integrations","Scenarios requiring keyless, pay-per-request API access on Base"],"notFor":["Users needing detailed API documentation or response schemas before integrating","High-volume use cases where per-request pricing may add up compared to subscription plans","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:33.582Z"},"updatedAt":"2026-04-27T19:33:55.247Z"}}