{"id":"163791a7-5362-4345-8e43-2008e9e0ee6c","shortId":"UR7gfc","kind":"x402","title":"Check ARB wallet balances on-chain via x402 micropayment at $0.02 per request on Base.","tagline":"Check ARB wallet balances on-chain via x402 micropayment at $0.02 per request on Base.","description":"This x402-enabled endpoint at lowpaymentfee.com returns wallet balance information for ARB (Arbitrum) tokens. It is part of a broader suite of pay-per-call APIs offered by the same provider, spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per request settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/wallet/ARB/balance` accepts POST requests and is gated by the x402 payment protocol. When called without payment, it returns a 402 challenge advertising a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the `exact` scheme to the provider's wallet. No API keys or rate limits are advertised; access is instant once payment is included in the X-PAYMENT header.\n\nDocumentation is extremely sparse. The provider's landing page lists many endpoints but the /docs, /pricing, /api, and /README pages all resolve to a minimal \"Connect wallet\" stub with no further technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples. The endpoint is confirmed live (402 challenge captured), but the actual response format and required request body fields are unknown.","tags":[],"capabilities":["wallet-balance","arb-token","x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["crypto","finance"],"synonyms":["ARB balance check","Arbitrum wallet balance","crypto wallet balance API","token balance lookup","x402 crypto API","web3 balance endpoint"],"warnings":["No OpenAPI or schema documentation available — request/response formats are entirely unknown","All doc pages (/docs, /pricing, /api, /README) return only a 'Connect wallet' stub with no content","The example request body (address field) is inferred and not confirmed by any documentation","Provider offers many endpoints but none appear to have public technical docs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/ARB/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/wallet/ARB/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no response schema, no request body documentation, and all secondary pages are empty stubs. The request example is inferred, not 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'/api/v1/wallet/arb/balance':91 '/docs':182 '/pricing':183 '/readme':186 '0.02':12,28,78,129 '000':118 '0x8335':123 '20':117 '2913':124 '402':110,218 '6':133 'ARB balance check' 'Arbitrum wallet balance' 'accept':92 'access':155 'actual':223 'advertis':112,154 'ai/ml':69 'analyt':68 'api':60,148 'arb':2,18,45 'arb-token' 'arbitrum':46 'balanc':4,20,42 'base':16,32,86,119,126 'base-network' 'bodi':229 'broader':53 'call':59,104 'captur':220 'chain':7,23 'challeng':111,219 'check':1,17 'confirm':216 'connect':193 'cost':115 'crypto wallet balance API' 'data':67 'decim':134 'detail':200 'document':168 'enabl':36 'endpoint':37,90,179,214 'equal':128 'exact':140 'exampl':212 'extrem':170 'field':230 'finance/web3':71 'format':225 'gate':97 'given':130 'header':167 'includ':161 'infer':70 'inform':43 'infrastructur':73 'instant':157 'key':149 'land':175 'limit':152 'list':177 'live':217 'lowpaymentfee.com':39 'made':137 'mani':178 'maximum':114 'micropay':10,26 'minim':192 'network':87 'no-api-key' 'offer':61 'on-chain':5,21 'openapi':204 'page':176,187 'part':50 'pay':57 'pay-per-cal':56 'pay-per-request' 'payment':101,106,135,159,166 'per':13,29,58,79 'post':93 'price':76 'protocol':102 'provid':65,144,173 'rate':151 'request':14,30,80,94,228 'request/response':207 'requir':227 'resolv':189 'respons':224 'return':40,108 'schema':208 'scheme':141 'settl':81 'span':66 'spars':171 'spec':205 'specif':89 'stub':195 'suit':54 'technic':199 'token':47 'token balance lookup' 'unit':120 'unknown':232 'usag':211 'usdc':83,122,131 'usdc-settlement' 'util':74 'via':8,24,138 'wallet':3,19,41,146,194 'wallet-balance' 'web3 balance endpoint' 'without':105 'x':165 'x-payment':164 'x402':9,25,35,100 'x402 crypto API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"620e960e-5f23-40b2-bd82-3c58b5efe1ac","listingId":"163791a7-5362-4345-8e43-2008e9e0ee6c","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/wallet/ARB/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":"2026-04-18T19:28:06.321Z"}],"sources":[{"listingId":"163791a7-5362-4345-8e43-2008e9e0ee6c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/ARB/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:06.321Z","lastSeenAt":"2026-04-23T14:01:59.076Z"}],"details":{"listingId":"163791a7-5362-4345-8e43-2008e9e0ee6c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/ARB/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{\"address\": \"0xYourWalletAddress\"}'","exampleRequest":{"address":"0x1234567890abcdef1234567890abcdef12345678"},"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/wallet/ARB/balance"},{"claim":"All APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/wallet/ARB/balance"}],"useCases":["Querying ARB token balances for a given wallet address","Integrating on-chain balance checks into trading bots or portfolio dashboards","Agent-driven wallet monitoring without managing API keys"],"bestFor":["Developers needing quick, keyless ARB balance lookups","AI agents that can settle x402 micropayments on Base","Applications requiring pay-per-call pricing with no subscription commitment"],"notFor":["Bulk historical balance queries (no evidence of batch or historical support)","Users who need detailed documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.148Z"},"updatedAt":"2026-04-23T14:01:59.076Z"}}