{"id":"590df9c7-e5a5-4359-a273-6aee5163ee48","shortId":"QxSdJU","kind":"x402","title":"x402-gated account balance endpoint on Base, paid per-call in USDC.","tagline":"x402-gated account balance endpoint on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" resource at the path `/api/v1/accounts/63/balance`. It is part of a broader platform that offers dozens of x402-payable API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all settled on the Base network using USDC.\n\nThe specific endpoint probed returns an account balance (for account ID 63) and accepts POST requests. Payment is handled via the x402 protocol: callers must include an `X-PAYMENT` header with a valid payment proof. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. The platform advertises a flat $0.02/request pricing model across all its endpoints, with no API keys, no rate limits, and no minimum commitments.\n\nThe endpoint is live and returned a proper 402 challenge during probing. However, documentation is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for what the balance response actually contains. The endpoint's purpose (returning an \"account balance\") is vaguely described, and it is unclear what \"account 63\" refers to or what the response payload looks like.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","per-call-pricing","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","crypto payment API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","All doc/pricing/README pages return only a 'Connect wallet' prompt with no substantive content","The meaning of 'account 63 balance' is undocumented — unclear what data is returned","No response examples or field definitions available","The broader platform lists many endpoints but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/63/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/63/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no content. The purpose of this specific endpoint (account 63 balance) is unclear, and no response format is 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'/request':138 '0.02':130,137 '000':121 '20':120 '402':164 '6':126 '63':88,227 'Base network API' 'USDC micropayment API' 'accept':90 'access':37 'account':4,18,83,86,216,226 'account balance API' 'account-balance' 'across':141 'actual':208 'advertis':134 'ai/ml':62 'amount':115 'analyt':61 'api':36,57,147,175 'balanc':5,19,84,206,217 'base':8,22,73,122 'base-network' 'broader':48 'call':12,26,118 'caller':100 'challeng':165 'commit':155 'connect':184 'contain':209 'content':190 'crypto payment API' 'data':60,65 'decim':127 'describ':220 'detail':201 'doc':174 'document':169,202 'dozen':52 'endpoint':6,20,30,58,79,144,157,211 'equal':129 'exampl':198 'extrem':171 'finance/web3':64 'flat':136 'gate':3,17 'handl':95 'header':107 'howev':168 'id':87 'includ':102 'infer':63 'key':148 'like':236 'limit':151 'live':159 'look':235 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':114 'minimum':154 'model':140 'must':101 'network':74 'no-api-key' 'offer':51 'openapi':194 'page':179 'paid':9,23 'part':45 'path':41 'pay-per-call API' 'payabl':56 'payload':234 'payment':93,106,111 'per':11,25,117 'per-cal':10,24 'per-call-pricing' 'platform':49,133 'post':91 'premium':35 'price':139,176 'probe':80,167 'prompt':186 'proof':112 'proper':163 'protocol':99 'provid':33 'purpos':213 'rate':150 'readm':178 'refer':228 'render':181 'request':92 'request/response':197 'requir':116 'resourc':38 'respons':207,233 'return':81,161,214 'schema':195 'servic':68 'settl':70 'span':59 'specif':78 'substant':189 'thin':172 'unclear':224 'unit':123 'usd':131 'usdc':14,28,76,125 'usdc-settlement' 'use':75 'util':67 'vagu':219 'valid':110 'via':96 'wallet':185 'x':105 'x-payment':104 'x402':2,16,55,98 'x402 paid endpoint' 'x402-gated':1,15 'x402-payable':54 'x402-payment'","prices":[{"id":"2b06eaa0-c7d9-4791-aa76-ce6a9f3a6441","listingId":"590df9c7-e5a5-4359-a273-6aee5163ee48","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/63/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":"2026-04-18T18:39:56.477Z"}],"sources":[{"listingId":"590df9c7-e5a5-4359-a273-6aee5163ee48","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/63/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:56.477Z","lastSeenAt":"2026-04-28T05:33:51.253Z"}],"details":{"listingId":"590df9c7-e5a5-4359-a273-6aee5163ee48","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/63/balance \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\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 requiring USDC payment on Base network with maxAmountRequired of 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/accounts/63/balance"},{"claim":"The 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":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance data with per-call USDC micropayments","Integrating x402-compatible payment flows into agent workflows","Accessing paid API resources without API key registration"],"bestFor":["Developers experimenting with x402 protocol payments","Agents that can settle USDC on Base for per-call API access","Low-volume consumers who want pay-as-you-go pricing without subscriptions"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integration","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:37.547Z"},"updatedAt":"2026-04-28T05:33:51.253Z"}}