{"id":"3eb25eaa-56f2-478a-b2e4-4a3147045a10","shortId":"zk6ecr","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 account ID 109. It is part of a broader platform offering pay-per-call APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories — all settled via the x402 protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/accounts/109/balance` accepts POST requests and is gated behind an x402 payment challenge. The maximum amount required per call is 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 USD (USDC uses 6 decimals). Payment is made inline via the X-PAYMENT header — no API keys, subscriptions, or rate limits are advertised. The payment timeout is 300 seconds.\n\nThe platform's landing page lists numerous other endpoints at similar $0.02 price points spanning sentiment analysis, text summarization, embeddings, price feeds, gas estimates, geocoding, and more. Documentation pages beyond the landing page returned only a \"Connect wallet\" prompt with no further technical detail, so the exact request body schema and response format for this balance endpoint are unknown. The endpoint is live and returning a valid x402 challenge.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-request","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","USDC micropayment API","x402 balance check","Base network API","pay-per-call balance","lowpaymentfee"],"warnings":["No API documentation available — all doc pages return only 'Connect wallet' with no technical content","Request body schema and response format are completely undocumented","Endpoint is hardcoded to account ID 109; unclear what 'account' refers to or whether other IDs are accessible","Platform lists many endpoint categories but none have visible documentation beyond titles and prices"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/109/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/109/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 with clear pricing, but there is no OpenAPI schema, no documented request/response format, and all documentation pages beyond the landing page are empty stubs. The purpose of this specific endpoint (account 109 balance) is vague and the broader platform lacks substantive 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'0.02':11,24,105,147 '000':95 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':100 '109':38 '20':94 '300':134 '6':109 'Base network API' 'USDC micropayment API' 'accept':76 'account':2,15,32,36 'account balance API' 'account-balance' 'across':52 'advertis':129 'ai/ml':55 'amount':89 'analysi':152 'analyt':54 'api':51,122 'balanc':3,16,33,191 'base':8,21,68,96,102 'base-network' 'behind':82 'beyond':165 'bodi':184 'broader':44 'call':50,92 'categori':59 'challeng':86,204 'check':1,14 'connect':172 'data':53 'decim':110 'detail':179 'document':163 'embed':155 'endpoint':28,74,144,192,196 'equal':104 'estim':159 'exact':182 'feed':157 'finance/web3':56 'format':188 'gas':158 'gate':81 'geocod':160 'header':120 'id':37 'inform':34 'infrastructur':58 'inlin':114 'key':123 'land':139,167 'limit':127 'list':141 'live':198 'lowpaymentfee' 'lowpaymentfee.com':30 'made':113 'maximum':88 'micropay':6,19 'network':9,22,69 'no-api-key' 'numer':142 'offer':46 'page':140,164,168 'part':41 'pay':48 'pay-per-cal':47 'pay-per-call balance' 'pay-per-request' 'payment':85,111,119,131 'per':12,25,49,91 'platform':45,137 'point':149 'post':77 'price':148,156 'prompt':174 'protocol':65 'rate':126 'request':13,26,78,183 'requir':90 'respons':187 'return':31,169,200 'schema':185 'second':135 'sentiment':151 'settl':61 'similar':146 'span':150 'specif':73 'subscript':124 'summar':154 'technic':178 'text':153 'timeout':132 'unit':97 'unknown':194 'usd':106 'usdc':71,99,107 'usdc-settlement' 'use':70,108 'valid':202 'via':4,17,62,115 'wallet':173 'x':118 'x-payment':117 'x402':5,18,64,84,203 'x402 balance check' 'x402-payment'","prices":[{"id":"867273a8-7f87-419d-96c5-35d88f9f636d","listingId":"3eb25eaa-56f2-478a-b2e4-4a3147045a10","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/109/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":"2026-04-18T18:40:43.133Z"}],"sources":[{"listingId":"3eb25eaa-56f2-478a-b2e4-4a3147045a10","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/109/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:43.133Z","lastSeenAt":"2026-04-27T22:32:47.524Z"}],"details":{"listingId":"3eb25eaa-56f2-478a-b2e4-4a3147045a10","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/109/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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/109/balance"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/109/balance"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance information programmatically with per-request USDC payment","Integrating balance lookups into agent workflows without managing API keys","Demonstrating x402 protocol micropayment flows on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-call account balance data","Low-volume balance queries where subscription APIs are overkill"],"notFor":["High-volume balance polling where per-request fees add up","Users who need detailed API documentation or guaranteed SLAs","Querying balances for arbitrary account IDs (endpoint is hardcoded to account 109)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:35.316Z"},"updatedAt":"2026-04-27T22:32:47.524Z"}}