{"id":"bbe719d6-951b-4775-bc74-a473e49571bd","shortId":"RtnZqa","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\" account balance lookup via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated behind x402 micropayments on the Base network using USDC.\n\nThe specific endpoint `/api/v1/accounts/86/balance` accepts POST requests and returns JSON. The x402 challenge indicates 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 advertises uniform $0.02/request pricing across all its endpoints, with no API keys, no rate limits, and no minimum commitments required. Payment is settled on-chain on Base via the x402 \"exact\" scheme.\n\nDocumentation on the site 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 explanation of what the \"account balance\" endpoint actually returns or what parameters it accepts. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation makes it difficult to use without experimentation.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","account-balance","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto payment API"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet' with no content","No OpenAPI or request/response schema provided; request parameters and response format are unknown","The endpoint path references a specific account ID (86), and it is unclear whether this is parameterizable or what 'balance' refers to","The broader platform lists many endpoints (AI, finance, utils) but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/86/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/86/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 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the docs pages are empty. The purpose of this specific endpoint (account 86 balance) is unexplained, making it effectively a stub 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'/request':130 '0.02':118,129 '000':107 '0x8335':112 '20':106 '2913':113 '402':218 '6':123 'Base network API' 'USDC pay-per-call' 'accept':92,209 'access':37 'account':4,18,38,200 'account balance API' 'account-balance' 'across':132 'actual':203 'advertis':127 'ai/ml':70 'analyt':69 'api':36,66,138,170 'balanc':5,19,39,201 'base':8,22,84,108,115,155 'base-network' 'behind':79 'call':12,26 'chain':153 'challeng':100,219 'commit':146 'confirm':213 'connect':179 'content':185 'cost':104 'crypto payment API' 'data':68,73 'decim':124 'difficult':227 'doc':169 'document':161,224 'endpoint':6,20,30,51,90,135,202,211 'equal':117 'exact':159 'exampl':193 'experiment':231 'explan':196 'extrem':166 'finance/web3':72 'gate':3,17,78 'host':58 'indic':101 'infer':71 'infrastructur':75 'json':97 'json-response' 'key':139 'lack':222 'limit':142 'live':214 'lookup':40 'lowpaymentfee' 'lowpaymentfee.com':32,55 'make':225 'mani':50 'maximum':103 'micropay':81 'micropayment API' 'minimum':145 'network':85 'no-api-key' 'offer':52 'on-chain':151 'one':48 'openapi':189 'page':174 'paramet':207 'pay':10,24,63 'pay-per-cal':9,23 'pay-per-request':62 'payment':44,148 'per':11,25,64,119 'platform':56,126 'post':93 'premium':35 'price':131,171 'prompt':181 'proper':217 'protocol':45 'provid':33 'rate':141 'readm':173 'render':176 'request':65,94,120 'request/response':192 'requir':147 'return':96,204,215 'schema':190 'scheme':160 'settl':150 'site':164 'span':67 'specif':89 'substant':184 'thin':167 'uniform':128 'unit':109 'usdc':14,28,87,111,121 'usdc-micropayment' 'use':86,122,229 'util':76 'varieti':60 'via':41,156 'wallet':180 'without':230 'x402':2,16,43,80,99,158 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"03564489-a583-43f0-9353-f635190012f3","listingId":"bbe719d6-951b-4775-bc74-a473e49571bd","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/86/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":"2026-04-18T18:40:14.617Z"}],"sources":[{"listingId":"bbe719d6-951b-4775-bc74-a473e49571bd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/86/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:14.617Z","lastSeenAt":"2026-04-28T03:33:09.573Z"}],"details":{"listingId":"bbe719d6-951b-4775-bc74-a473e49571bd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/86/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 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/86/balance"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying account balance information via a pay-per-call model without API key registration","Integrating micropayment-gated balance lookups into agent workflows on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need on-demand balance data without subscription commitments","Low-volume, pay-as-you-go API consumption on Base"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","High-volume use cases where $0.02/request adds up significantly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:36.708Z"},"updatedAt":"2026-04-28T03:33:09.573Z"}}