Check MASK token wallet balance on-chain via x402 micropayment at $0.02 per request.
What it does
This endpoint at lowpaymentfee.com returns the wallet balance for the MASK token. It is part of a broader suite of x402-protocol APIs offered by the same provider, spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints on the platform share a uniform $0.02-per-request pricing model settled in USDC on the Base network.
The specific endpoint `/api/v1/wallet/MASK/balance` accepts POST requests and is gated by the x402 payment protocol. When called without payment, it returns a 402 challenge specifying the USDC asset on Base (contract 0x8335…2913) with a maxAmountRequired of 20000 base units, which equals $0.02 (USDC uses 6 decimals). Payment is made via the `X-PAYMENT` header. No API keys, rate limits, or subscriptions are required — each call is individually paid.
Documentation on the site is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material. The endpoint is live and responds with a valid x402 challenge, but the actual response format for a successful (paid) call is unknown.
Capabilities
Use cases
- —Querying the current MASK token balance for a given wallet address
- —Integrating real-time MASK balance data into portfolio trackers or dashboards
- —Automated agents checking wallet balances before executing trades or transfers
Fit
Best for
- —Developers needing quick, keyless access to MASK token balances
- —AI agents that can settle x402 micropayments on Base
- —Applications requiring per-call billing with no subscription overhead
Not for
- —Bulk or high-frequency balance polling where per-call fees add up quickly
- —Users who need balances for tokens other than MASK (this endpoint is MASK-specific)
- —Anyone without a Base-network USDC wallet to settle payments
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wallet/MASK/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it exists and is gated. However, there is no documentation, no OpenAPI schema, no request body schema, and no example responses. The docs pages are empty stubs. The actual functionality (what input it expects, what it returns) must be entirely inferred from the URL path.
Warnings
- —No documentation available — all doc/API/pricing/README pages render only 'Connect wallet' with no content.
- —No OpenAPI or request/response schema provided; request body format and response structure are unknown.
- —The provider lists many endpoints across diverse categories (AI, analytics, finance, utilities) all at $0.02 — it is unclear whether these are fully implemented or placeholder listings.
- —MASK token specifics (which chain's MASK, which wallet format) are not documented.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base networkhttps://lowpaymentfee.com/api/v1/wallet/MASK/balance
- —All endpoints on the platform 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/MASK/balance