{"id":"05fc643f-ab5c-4a0b-aff2-67885b0c435c","shortId":"S95JdN","kind":"x402","title":"x402-gated account balance endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated account balance endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" resource at the path `/api/v1/accounts/30/balance`. It is part of a broader platform that offers dozens of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all gated via the x402 payment protocol on the Base network.\n\nThe specific endpoint probed returns an x402 challenge requesting payment in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base) with a `maxAmountRequired` of 20,000 base units. Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the platform's advertised flat pricing of $0.02/request across all endpoints. Payment is made via the `exact` scheme, and the endpoint accepts POST requests.\n\nThe platform advertises no API keys, no rate limits, and instant access. Documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual response schema and detailed behavior of this particular balance endpoint remain undocumented. The endpoint is live (returns a proper 402 challenge), but without documentation or example responses, it is unclear exactly what data the balance response contains or what input parameters (if any) the POST body expects.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","account-balance","json-response","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","USDC payment API","x402 endpoint","Base network API","pay-per-call API","micropayment API","lowpaymentfee"],"warnings":["No API documentation available — all doc pages return only 'Connect wallet' with no content","Response schema for this endpoint is completely unknown","The specific meaning of 'accounts/30/balance' is undocumented — it is unclear whether '30' is a fixed demo account or a parameterized path","No input schema documented for the POST body"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/30/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/30/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 ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, no example responses, and the purpose of this specific '/accounts/30/balance' path is unclear. Effectively a stub 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'/api/v1/accounts/30/balance':42 '/docs':157 '/pricing':158 '/readme':160 '/request':126 '0.02':113,125 '000':102 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':94 '20':101 '402':194 '6':108 'Base network API' 'USDC payment API' 'accept':140 'access':37,154 'account':4,18 'account balance API' 'account-balance' 'across':127 'actual':174 'advertis':121,145 'ai/ml':63 'analyt':62 'api':36,58,147 'balanc':5,19,183,209 'base':8,22,79,96,103 'behavior':179 'bodi':220 'broader':48 'call':12,26 'challeng':88,195 'connect':165 'consist':116 'contain':211 'content':171 'contract':93 'data':61,66,207 'decim':109 'detail':178 'document':155,198 'dozen':52 'endpoint':6,20,30,59,83,129,139,184,188 'exact':135,205 'exampl':200 'expect':221 'finance/web3':65 'flat':122 'gate':3,17,71 'infer':64 'input':214 'instant':153 'json-response' 'key':148 'limit':151 'live':190 'lowpaymentfee' 'lowpaymentfee.com':32 'made':132 'maxamountrequir':99 'micropayment API' 'network':80 'no-api-key' 'offer':51 'page':156 'paramet':215 'part':45 'particular':182 'path':41 'pay':10,24,55 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request':54 'payment':75,90,130 'per':11,25,56,114 'platform':49,119,144 'post':141,219 'premium':35 'price':123 'probe':84 'prompt':167 'proper':193 'protocol':76 'provid':33 'rate':150 'remain':185 'request':57,89,115,142 'resourc':38 'respons':175,201,210 'return':85,162,191 'schema':176 'scheme':136 'servic':69 'sinc':105 'span':60 'specif':82 'substant':170 'translat':111 'unclear':204 'undocu':186 'unit':104 'usdc':14,28,92,106 'usdc-base' 'use':107 'util':68 'via':72,133 'wallet':166 'without':197 'x402':2,16,74,87 'x402 endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"9089e189-9929-4ebe-89dd-3dea447f8f1b","listingId":"05fc643f-ab5c-4a0b-aff2-67885b0c435c","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/30/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":"2026-04-18T18:39:29.961Z"}],"sources":[{"listingId":"05fc643f-ab5c-4a0b-aff2-67885b0c435c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/30/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:29.961Z","lastSeenAt":"2026-04-30T08:34:12.935Z"}],"details":{"listingId":"05fc643f-ab5c-4a0b-aff2-67885b0c435c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/30/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/accounts/30/balance"},{"claim":"Platform offers endpoints across data analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance data via a single paid API call","Integrating pay-per-request balance lookups into agent workflows","Accessing financial data without API key registration"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Developers wanting zero-signup, pay-per-call API access","Prototyping with micropayment-gated endpoints"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume use cases where $0.02/request adds up significantly","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:38.753Z"},"updatedAt":"2026-04-30T08:34:12.935Z"}}