{"id":"e4ff7c9c-0e1d-4056-b6ee-045198e4517e","shortId":"rPmQvA","kind":"x402","title":"x402-gated account balance endpoint on Base, paying $0.02 per request in USDC.","tagline":"x402-gated account balance endpoint on Base, paying $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides an account balance lookup via the x402 payment protocol. The specific resource `/api/v1/accounts/98/balance` returns JSON data when called with a valid x402 payment header. It is part of a broader platform that offers multiple API categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request.\n\nPayment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) via the x402 \"exact\" scheme. The max amount required is 20,000 base units, which at 6 decimals equals $0.02. No API keys or rate limits are advertised; access is gated purely by the x402 payment challenge. The endpoint accepts POST requests and returns application/json.\n\nThe platform's documentation pages (docs, pricing, README) all render only a \"Connect wallet\" prompt with no substantive content, so the actual response schema and detailed behavior of this specific endpoint are unknown. The endpoint is confirmed live — it returns a well-formed 402 challenge. However, the purpose of an \"account balance\" endpoint on this domain is unclear; it may be a demo or placeholder resource rather than a production financial data source.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","json-response","per-request-pricing","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 API","USDC micropayment API","pay-per-call API","Base network API","lowpaymentfee","crypto payment endpoint"],"warnings":["All documentation pages (docs, pricing, README) render only 'Connect wallet' with no actual content","No response schema or example responses available for this endpoint","The specific resource '/api/v1/accounts/98/balance' purpose is unclear — may be a demo or placeholder","The broader platform lists many API categories but none could be verified beyond the 402 challenge"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/98/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/98/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, but there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, no example responses, and the purpose of this specific 'accounts/98/balance' resource is unclear. Effectively a stub 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'0.02':10,24,84,117 '000':109 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':97 '20':108 '402':187 '6':114 'Base network API' 'USDC micropayment API' 'accept':137 'access':126 'account':4,18,35,194 'account balance API' 'account-balance' 'actual':164 'advertis':125 'ai':73 'amount':105 'analyt':72 'api':68,119 'application/json':142 'balanc':5,19,36,195 'base':8,22,92,110 'base-network' 'behavior':169 'broader':63 'call':51 'categori':69 'challeng':134,188 'confirm':179 'connect':155 'content':161 'contract':96 'crypto payment endpoint' 'data':49,71,215 'decim':115 'demo':206 'detail':168 'doc':148 'document':146 'domain':199 'endpoint':6,20,30,136,173,177,196 'equal':116 'exact':101 'financ':76 'financi':214 'form':186 'gate':3,17,128 'header':57 'howev':189 'includ':70 'infrastructur':79 'json':48 'json-response' 'key':120 'learn':75 'limit':123 'live':180 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':74 'max':104 'may':203 'multipl':67 'network':93 'no-api-key' 'offer':66 'page':147 'part':60 'pay':9,23 'pay-per-call API' 'payment':41,56,87,133 'per':11,25,85 'per-request-pricing' 'placehold':208 'platform':64,144 'post':138 'price':82,149 'product':213 'prompt':157 'protocol':42 'provid':33 'pure':129 'purpos':191 'rate':122 'rather':210 'readm':150 'render':152 'request':12,26,86,139 'requir':106 'resourc':45,209 'respons':165 'return':47,141,182 'schema':166 'scheme':102 'settl':89 'sourc':216 'specif':44,172 'substant':160 'unclear':201 'unit':111 'unknown':175 'usdc':14,28,95 'usdc-settlement' 'use':94 'util':80 'valid':54 'via':38,98 'wallet':156 'web3':77 'well':185 'well-form':184 'x402':2,16,40,55,100,132 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"b47e8232-271a-4b31-859b-edbbfd20b796","listingId":"e4ff7c9c-0e1d-4056-b6ee-045198e4517e","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/98/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":"2026-04-18T18:40:23.753Z"}],"sources":[{"listingId":"e4ff7c9c-0e1d-4056-b6ee-045198e4517e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/98/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:23.753Z","lastSeenAt":"2026-04-28T02:33:33.948Z"}],"details":{"listingId":"e4ff7c9c-0e1d-4056-b6ee-045198e4517e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/98/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 402 challenge with x402Version 1, exact scheme, on Base network using USDC","source_url":"https://lowpaymentfee.com/api/v1/accounts/98/balance"},{"claim":"maxAmountRequired is 20000 base units (USDC, 6 decimals = $0.02)","source_url":"https://lowpaymentfee.com/api/v1/accounts/98/balance"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/98/balance"}],"useCases":["Querying account balance data with per-request USDC micropayments","Demonstrating x402 payment protocol integration","Agent-driven API calls settled on Base L2 without API keys"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base","Use cases requiring keyless, pay-per-call API access"],"notFor":["Users needing detailed API documentation or response schemas","High-volume use cases where $0.02/request adds up significantly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:36.262Z"},"updatedAt":"2026-04-28T02:33:33.948Z"}}