Check MKR wallet balance via x402 micropayment on Base for $0.02 per request.
What it does
This endpoint at lowpaymentfee.com returns the balance of a MKR (Maker) wallet. It is part of a broader suite of pay-per-call APIs offered by lowpaymentfee.com, all gated behind the x402 payment protocol. The endpoint accepts POST requests and charges $0.02 per call, settled in USDC on the Base network. No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The provider's landing page lists several API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. This specific endpoint (/api/v1/wallet/MKR/balance) falls under the Finance & Web3 category. The x402 challenge confirms the endpoint is live, advertising a maxAmountRequired of 20000 base units of USDC (6 decimals), which equals $0.02.
Documentation is extremely sparse. The /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The exact request body format and response structure must be inferred or discovered experimentally.
Capabilities
Use cases
- —Checking the MKR token balance of a given wallet address
- —Building portfolio trackers that need on-demand balance lookups
- —Automated trading bots verifying MKR holdings before executing trades
- —Agent workflows that need to confirm wallet balances without managing API keys
Fit
Best for
- —Agents needing keyless, pay-per-call crypto balance checks
- —Low-volume or sporadic MKR balance queries where subscriptions are overkill
- —x402-native workflows on the Base network
Not for
- —High-frequency balance polling where per-call fees add up quickly
- —Users who need multi-token or batch balance queries in a single call
- —Anyone requiring detailed documentation or guaranteed SLAs
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wallet/MKR/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>" \
-d '{"address": "0xYourWalletAddress"}'Example
Request
{
"address": "0x1234567890abcdef1234567890abcdef12345678"
}Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, documentation is essentially nonexistent — no OpenAPI spec, no request/response schema, no examples. The docs, pricing, and README pages all show only a wallet-connect prompt. The request and response formats are entirely inferred.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet' with no technical content.
- —No OpenAPI or schema definition found; request body format is guessed.
- —Response schema is unknown — example_response_json is null.
- —The provider lists many diverse API categories (AI, analytics, finance, infrastructure) all at the same price, which may indicate a generic or placeholder service.
Citations
- —The endpoint returns HTTP 402 with x402 challenge, confirming it is live.https://lowpaymentfee.com/api/v1/wallet/MKR/balance
- —maxAmountRequired is 20000 base units of USDC (USD Coin, 6 decimals) = $0.02 on Base network.https://lowpaymentfee.com/api/v1/wallet/MKR/balance
- —The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access.https://lowpaymentfee.com
- —Documentation pages (/docs, /pricing, /api, /README) contain only a 'Connect wallet' prompt.https://lowpaymentfee.com/docs