Check ARB wallet balances on-chain via x402 micropayment at $0.02 per request on Base.
What it does
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.
The 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.
Documentation 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.
Capabilities
Use cases
- —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
Fit
Best for
- —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
Not for
- —Bulk historical balance queries (no evidence of batch or historical support)
- —Users who need detailed documentation or guaranteed SLAs before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wallet/ARB/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{"address": "0xYourWalletAddress"}'Example
Request
{
"address": "0x1234567890abcdef1234567890abcdef12345678"
}Endpoint
Quality
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 documented.
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
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/wallet/ARB/balance
- —All APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/wallet/ARB/balance