{"id":"dadf18ac-8b8e-4bd0-982b-911554a7b294","shortId":"KNKT8p","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 143) behind an x402 paywall. It is part of a broader platform offering dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/accounts/143/balance` accepts POST requests and requires an X-PAYMENT header conforming to the x402 protocol (version 1, \"exact\" scheme). The maximum amount required is 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. The response MIME type is application/json.\n\nThe platform advertises no API keys, no rate limits, and instant access. Documentation pages (/docs, /pricing, /README) appear to require wallet connection and contain no substantive content in the crawl. There is no OpenAPI schema, no detailed request/response documentation, and no examples of what the balance response payload looks like. The endpoint is live (returns a valid 402 challenge), but the actual functionality behind the paywall — what fields the balance response contains, what \"account 143\" refers to — is undocumented in available materials.","tags":[],"capabilities":["x402-payment","usdc-base","account-balance","pay-per-request","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 balance check","USDC micropayment API","Base network API","pay-per-call balance","lowpaymentfee"],"warnings":["No OpenAPI or request/response schema available — actual response format is unknown","Documentation pages (/docs, /pricing, /README) are wallet-gated and contain no crawlable content","The meaning of 'account 143' and what balance data is returned is undocumented","Platform lists many endpoints but none have detailed documentation in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/143/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/143/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 request/response documentation, and no examples of the actual payload. The docs pages are empty (wallet-gated). The specific purpose of 'account 143 balance' is 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'/docs':162 '/pricing':163 '/readme':164 '0.02':11,24,74,125 '000':114 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':136 '0x8335':119 '1':105 '143':41,222 '20':113 '2913':120 '300':139 '402':205 '6':129 'Base network API' 'USDC micropayment API' 'accept':89 'access':159 'account':2,15,32,38,39,221 'account balance API' 'account-balance' 'actual':209 'address':135 'advertis':150 'ai/ml':64 'amount':110 'analyt':63 'api':60,152 'appear':165 'application/json':147 'avail':228 'balanc':3,16,33,193,217 'base':8,21,83,115,122 'behind':42,211 'broader':51 'call':59 'challeng':206 'check':1,14 'conform':99 'connect':169 'contain':171,219 'content':174 'crawl':177 'data':62,67 'decim':130 'detail':184 'document':160,186 'dozen':54 'endpoint':28,87,199 'equal':124 'exact':106 'exampl':189 'field':215 'finance/web3':66 'function':210 'given':126 'header':98 'id':40 'infer':65 'inform':34 'instant':158 'key':153 'like':197 'limit':156 'live':201 'look':196 'lowpaymentfee' 'lowpaymentfee.com':30 'materi':229 'maximum':109 'micropay':6,19 'mime':144 'network':9,22,84 'no-api-key' 'offer':53 'openapi':181 'page':161 'part':48 'pay':57 'pay-per-cal':56 'pay-per-call balance' 'pay-per-request' 'payload':195 'payment':97,131 'paywal':45,213 'per':12,25,58,75 'platform':52,149 'post':90 'price':72 'protocol':103 'rate':155 'refer':223 'request':13,26,76,91 'request/response':185 'requir':93,111,167 'respons':143,194,218 'return':31,202 'schema':182 'scheme':107 'second':140 'sent':133 'servic':70 'settl':78 'span':61 'specif':37,86 'substant':173 'timeout':141 'type':145 'undocu':226 'unit':116 'usdc':80,118,127 'usdc-base' 'util':69 'valid':204 'version':104 'via':4,17 'wallet':168 'x':96 'x-payment':95 'x402':5,18,44,102 'x402 balance check' 'x402-payment'","prices":[{"id":"2dc6aec9-328f-41ec-87d7-855f67c586cf","listingId":"dadf18ac-8b8e-4bd0-982b-911554a7b294","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/143/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":"2026-04-18T18:41:05.397Z"}],"sources":[{"listingId":"dadf18ac-8b8e-4bd0-982b-911554a7b294","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/143/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:05.397Z","lastSeenAt":"2026-04-27T20:34:32.026Z"}],"details":{"listingId":"dadf18ac-8b8e-4bd0-982b-911554a7b294","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/143/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 challenge requiring 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/143/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":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/143/balance"}],"useCases":["Querying account balance data programmatically with per-request USDC micropayments","Integrating balance lookups into autonomous agent workflows without API key management","Testing x402 protocol payment flows on Base network"],"bestFor":["Developers experimenting with x402 pay-per-call protocols","Agents needing keyless, on-demand API access settled in USDC on Base","Low-volume balance queries where subscription pricing is unnecessary"],"notFor":["High-volume balance queries where per-request fees add up quickly","Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:34.241Z"},"updatedAt":"2026-04-27T20:34:32.026Z"}}