{"id":"423e7e36-e8cd-441a-9da5-71e089f5a101","shortId":"akfLe3","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 an account balance lookup (account ID 152) behind an x402 paywall. It is part of a broader platform that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all gated via the x402 protocol on the Base network and settled in USDC.\n\nThe specific endpoint `/api/v1/accounts/152/balance` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform's landing page confirms uniform $0.02/request pricing across all endpoints, with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The endpoint is confirmed live (returns a proper 402 x402 challenge), but without documentation it is unclear what request body this endpoint expects or what the response payload looks like beyond the stated `application/json` MIME type.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 API","USDC micropayment API","pay-per-call API","Base network API","lowpaymentfee","crypto payment API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema definition provided for request or response payloads.","The specific purpose of 'account 152 balance' is undocumented; it is unclear what data is returned or what input is expected.","The broader platform lists many endpoints (AI, analytics, finance, utils) but none have documented schemas."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/152/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/152/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 and clear pricing ($0.02/request in USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response examples, and the docs pages are empty. The purpose of this specific endpoint (account 152 balance) is vague and 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'/api/v1/accounts/152/balance':89 '/docs':153 '/pricing':154 '/readme':157 '/request':131 '0.02':116,130 '000':105 '0x8335':110 '152':40 '20':104 '2913':111 '402':192 '6':121 'Base network API' 'USDC micropayment API' 'accept':90 'account':4,18,35,38 'account balance API' 'account-balance' 'across':133 'advertis':99 'ai/ml':65 'analyt':64 'api':61,138 'application/json':217 'avail':183 'balanc':5,19,36 'base':8,22,80,106,113 'base-network' 'behind':41 'beyond':214 'bodi':203 'broader':50 'call':12,26 'challeng':98,194 'commit':146 'confirm':128,187 'connect':163 'content':169 'cost':102 'crypto payment API' 'data':63,68 'decim':122 'document':148,178,197 'endpoint':6,20,30,88,135,185,205 'equal':115 'exampl':182 'expect':206 'extrem':150 'finance/web3':67 'gate':3,17,73 'id':39 'infer':66 'json':95 'json-response' 'key':139 'land':126 'like':213 'limit':142 'live':188 'look':212 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':101 'mime':218 'minimum':145 'network':81 'no-api-key' 'offer':53 'openapi':173 'page':127,158 'part':47 'pay':10,24,58 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request':57 'payload':211 'paywal':44 'per':11,25,59,117 'platform':51,124 'post':91 'price':132 'prompt':165 'proper':191 'protocol':77 'provid':33 'rate':141 'render':160 'request':60,92,118,202 'request/response':176 'requir':147 'respons':210 'return':94,189 'schema':177 'servic':71 'settl':83 'span':62 'spars':151 'spec':174 'specif':87 'state':216 'type':219 'unclear':200 'uniform':129 'unit':107 'usag':181 'usdc':14,28,85,109,119 'usdc-settlement' 'use':120 'util':70 'varieti':55 'via':74 'wallet':164 'without':196 'x402':2,16,43,76,97,193 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"0b55c93e-1920-48ca-9da7-456664372ce6","listingId":"423e7e36-e8cd-441a-9da5-71e089f5a101","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/152/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":"2026-04-18T18:41:12.682Z"}],"sources":[{"listingId":"423e7e36-e8cd-441a-9da5-71e089f5a101","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/152/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:12.682Z","lastSeenAt":"2026-04-27T20:34:32.340Z"}],"details":{"listingId":"423e7e36-e8cd-441a-9da5-71e089f5a101","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/152/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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/152/balance"},{"claim":"Uniform pricing of $0.02 per request across all endpoints, no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/152/balance"}],"useCases":["Querying account balance data with per-request USDC micropayments","Agent-driven financial data retrieval without API key management","Programmatic balance checks settled on Base L2"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integration","High-volume use cases where per-request pricing may add up compared to flat-rate plans","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:33.867Z"},"updatedAt":"2026-04-27T20:34:32.340Z"}}