Check BNB wallet balances via x402 micropayment — $0.02 per request on Base.
What it does
This endpoint at lowpaymentfee.com returns BNB wallet balance data, accessible through the x402 payment protocol. Each request costs $0.02 (20,000 base units of USDC on the Base network, where USDC has 6 decimals). No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof to receive the response.
The endpoint is part of a broader suite of pay-per-call APIs offered by lowpaymentfee.com spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced uniformly at $0.02 per request. The specific endpoint `/api/v1/wallet/BNB/balance` sits in the Finance & Web3 category and presumably returns balance information for a BNB address, though the exact request and response schemas are not documented in the crawled material.
Payment settles on the Base L2 network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The x402 challenge confirms the endpoint is live, uses the "exact" payment scheme, and allows a maximum timeout of 300 seconds. No OpenAPI spec, detailed docs, or example responses were found during the crawl — the docs, pricing, and API pages all rendered only a "Connect wallet" prompt with no additional content.
Capabilities
Use cases
- —Querying BNB wallet balances programmatically without needing an API key
- —Integrating wallet balance checks into agent workflows that support x402 payments
- —Building portfolio trackers or dashboards that pull live BNB balance data
Fit
Best for
- —Agents or bots that can pay per-call via x402 on Base
- —Developers who want keyless, pay-as-you-go crypto balance lookups
- —Low-volume or sporadic balance queries where subscription APIs are overkill
Not for
- —High-volume balance monitoring where $0.02/request adds up quickly
- —Users who need detailed transaction history or token breakdowns beyond balance
- —Anyone without a Base-network USDC wallet to fund x402 payments
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wallet/BNB/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no example payloads, and the docs pages are empty beyond a wallet-connect prompt. The actual behavior of the endpoint (what input it expects, what it returns) must be entirely inferred from the URL path.
Warnings
- —No OpenAPI or schema documentation available — request and response formats are unknown
- —Docs, pricing, and API pages render only 'Connect wallet' with no usable content
- —The exact data returned (e.g., which BNB network, what fields) is not documented anywhere in the crawl
- —Cannot verify the endpoint actually returns meaningful BNB balance data without making a paid request
Citations
- —Endpoint returns HTTP 402 with x402 challenge, confirming it is livehttps://lowpaymentfee.com/api/v1/wallet/BNB/balance
- —Price is $0.02 per request (maxAmountRequired 20000 base units of USDC with 6 decimals)https://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/wallet/BNB/balance
- —No API keys, no rate limits, instant access advertisedhttps://lowpaymentfee.com
- —Uniform $0.02/request pricing across all listed endpointshttps://lowpaymentfee.com