{"id":"b9aaa192-71c9-4270-b252-14fede68fbea","shortId":"fzwaXz","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 66. 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/66/balance` accepts POST requests and is gated by an x402 payment challenge. The maximum amount required is 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 USD (USDC uses 6 decimals). Payment is made via the `exact` scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No API keys or rate limits are advertised; access is instant once payment is included in the X-PAYMENT header.\n\nDocumentation on the site is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the balance response payload looks like. The endpoint is confirmed live (returns 402 with a valid x402 challenge), but the actual utility and response format of this specific account balance endpoint remain unclear.","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 schema documentation available for this endpoint","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no content","Response format for the balance endpoint is completely undocumented","The specific meaning of 'account 66' is unexplained — unclear if this is a demo or a real resource","No examples of successful responses are available anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/66/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/66/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 x402 challenge, but documentation is effectively nonexistent — no OpenAPI spec, no request/response examples, and all doc pages show only 'Connect wallet'. The purpose of this specific account balance endpoint is unclear beyond its URL path. Score reflects a live but poorly documented 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'0.02':11,24,103 '000':93 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':118 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':98 '20':92 '300':121 '402':197 '6':107 '66':38 'Base network API' 'USDC micropayment API' 'accept':76 'access':132 'account':2,15,32,36,213 'account balance API' 'account-balance' 'across':52 'actual':205 'addit':168 'address':117 'advertis':131 'ai/ml':55 'amount':89 'analyt':54 'api':51,125,155 'balanc':3,16,33,186,214 'base':8,21,68,94,100 'broader':44 'call':50 'categori':59 'challeng':86,202 'check':1,14 'confirm':194 'connect':163 'data':53 'decim':108 'detail':170 'doc':153 'document':145,179 'endpoint':28,74,192,215 'equal':102 'exact':114 'exampl':182 'extrem':150 'finance/web3':56 'format':209 'gate':81 'header':144 'id':37 'includ':138 'inform':34 'infrastructur':58 'instant':134 'key':126 'like':190 'limit':129 'live':195 'look':189 'lowpaymentfee' 'lowpaymentfee.com':30 'made':111 'maximum':88 'micropay':6,19 'network':9,22,69 'no-api-key' 'offer':46 'openapi':174 'page':158 'part':41 'pay':48 'pay-per-cal':47 'pay-per-call balance' 'pay-per-request' 'payload':188 'payment':85,109,136,143 'per':12,25,49 'platform':45 'post':77 'price':154 'prompt':165 'protocol':65 'rate':128 'readm':157 'remain':216 'render':160 'request':13,26,78 'request/response':177 'requir':90 'respons':187,208 'return':31,196 'schema':178 'scheme':115 'second':122 'settl':61 'site':148 'spars':151 'spec':175 'specif':73,212 'technic':169 'timeout':123 'unclear':217 'unit':95 'usd':104 'usdc':71,97,105 'usdc-base' 'use':70,106 'util':206 'valid':200 'via':4,17,62,112 'wallet':164 'x':142 'x-payment':141 'x402':5,18,64,84,201 'x402 balance check' 'x402-payment'","prices":[{"id":"5d5103ba-eb62-4d00-810f-3095365b9163","listingId":"b9aaa192-71c9-4270-b252-14fede68fbea","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/66/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":"2026-04-18T18:39:58.873Z"}],"sources":[{"listingId":"b9aaa192-71c9-4270-b252-14fede68fbea","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/66/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:58.873Z","lastSeenAt":"2026-04-28T05:33:51.374Z"}],"details":{"listingId":"b9aaa192-71c9-4270-b252-14fede68fbea","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/66/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/66/balance"},{"claim":"Platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/66/balance"},{"claim":"Documentation pages render only 'Connect wallet' with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying account balance information for account 66 on the lowpaymentfee platform","Demonstrating x402 micropayment-gated API access on Base","Integrating pay-per-call balance checks into agent workflows"],"bestFor":["Developers experimenting with x402 protocol payments on Base","Agents needing on-demand account balance data without API key management","Low-volume, pay-as-you-go API consumption"],"notFor":["Production use cases requiring documented response schemas and SLAs","High-volume balance queries where per-request fees add up","Users who need detailed API documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:37.435Z"},"updatedAt":"2026-04-28T05:33:51.374Z"}}