{"id":"fd31f9f6-59b1-4a09-8d4f-0c2363da30e9","shortId":"RswbYv","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 per-request paid API behind the x402 payment protocol. The specific path `/api/v1/accounts/182/balance` is described as \"Premium API Access\" and returns JSON. It is part of a broader platform that advertises multiple API categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. Payment is settled on-chain via USDC (contract 0x8335…2913 on Base) to address 0x1A2B…85F3. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02. No API keys or rate limits are advertised; access is granted purely through the x402 payment header.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, 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 explanation of what the balance endpoint actually returns or what input it expects. The endpoint's purpose (account balance lookup) can only be inferred from the URL path. The broader platform lists many endpoints but provides no detailed documentation for any of them.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-pricing","account-balance","json-response"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 paid API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages are all empty","No OpenAPI or request/response schema provided; input format and response structure are unknown","The specific purpose of the /accounts/182/balance endpoint is unclear beyond the URL path inference","The broader platform lists many endpoints but none appear to have documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/182/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/182/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 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no explanation of what the endpoint actually returns. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1/accounts/182/balance':48 '/docs':164 '/pricing':166 '/readme':168 '0.02':84,141 '000':132 '0x1a2b':122 '0x8335':116 '20':131 '2913':117 '6':137 '85f3':123 'Base network API' 'USDC micropayment API' 'accept':104 'access':54,150 'account':4,18,209 'account balance API' 'account-balance' 'actual':198 'address':121 'advertis':66,149 'ai':73 'amount':126 'analyt':72 'api':39,53,68,143 'balanc':5,19,196,210 'base':8,22,93,119,133 'base-network' 'behind':40 'broader':63,221 'call':12,26,129 'categori':69 'chain':112 'challeng':97 'confirm':98 'connect':174 'content':180 'contract':115 'data':71 'decim':138 'describ':50 'detail':229 'document':159,189,230 'endpoint':6,20,30,100,197,206,225 'equal':140 'expect':204 'explan':192 'extrem':161 'financ':76 'gate':3,17 'grant':152 'header':158 'includ':70 'infer':215 'infrastructur':79 'input':202 'json':57 'json-response' 'key':144 'learn':75 'limit':147 'list':223 'live':102 'lookup':211 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':74 'mani':224 'maximum':125 'multipl':67 'network':94 'on-chain':110 'openapi':184 'page':169 'paid':9,23,38 'part':60 'path':47,219 'pay-per-call API' 'payment':43,107,157 'per':11,25,36,85,128 'per-cal':10,24 'per-request':35 'per-request-pricing' 'platform':64,222 'post':105 'premium':52 'price':82 'prompt':176 'protocol':44 'provid':33,227 'pure':153 'purpos':208 'rate':146 'render':171 'request':37,86,106 'request/response':187 'requir':127 'return':56,199 'schema':188 'settl':88,109 'spars':162 'spec':185 'specif':46 'unit':134 'url':218 'usdc':14,28,90,114,136 'usdc-settlement' 'util':80 'via':113 'wallet':175 'web3':77 'x402':2,16,42,96,156 'x402 paid API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"fa62689b-27da-434b-9054-368fdc0b7ed0","listingId":"fd31f9f6-59b1-4a09-8d4f-0c2363da30e9","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/182/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":"2026-04-18T18:41:34.347Z"}],"sources":[{"listingId":"fd31f9f6-59b1-4a09-8d4f-0c2363da30e9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/182/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:34.347Z","lastSeenAt":"2026-04-27T18:07:21.480Z"}],"details":{"listingId":"fd31f9f6-59b1-4a09-8d4f-0c2363da30e9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/182/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","source_url":"https://lowpaymentfee.com/api/v1/accounts/182/balance"},{"claim":"The 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 is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/182/balance"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a Connect wallet prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying account balance data via a pay-per-request model","Integrating x402-compatible payment flows into agent workflows","Accessing premium API data without API key registration"],"bestFor":["Developers experimenting with x402 payment protocol integrations","Agents that need keyless, pay-per-call API access on Base","Low-volume consumers who prefer no subscription commitments"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone needing non-USDC or non-Base payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:32.751Z"},"updatedAt":"2026-04-27T18:07:21.480Z"}}