Query KLAY wallet balances via x402 micropayment on Base for $0.02 per request.
What it does
This endpoint at lowpaymentfee.com returns KLAY (Klaytn) wallet balance data, gated behind the x402 payment protocol. Callers send a POST request with an X-PAYMENT header containing a signed USDC payment on the Base network. The cost is $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys or rate limits are required — access is granted purely through per-call micropayment.
The provider, lowpaymentfee.com, hosts a broad catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced uniformly at $0.02 per request. This specific endpoint sits in the Finance & Web3 category and is focused on retrieving cryptocurrency wallet balances for the KLAY token. The response format is application/json.
Documentation beyond the landing page is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the actual response schema and required request body fields are unknown.
Capabilities
Use cases
- —Checking KLAY token balances for a given wallet address
- —Integrating Klaytn balance lookups into portfolio trackers or dashboards
- —Automated monitoring of KLAY holdings across wallets
- —Agent-driven crypto balance queries without API key management
Fit
Best for
- —Developers needing quick, keyless access to KLAY wallet balances
- —AI agents that can settle x402 micropayments on Base
- —Applications requiring pay-per-use crypto data without subscriptions
Not for
- —High-volume balance queries where $0.02/call adds up significantly
- —Users needing balances for tokens other than KLAY (different endpoints exist)
- —Anyone requiring detailed transaction history beyond simple balance
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wallet/KLAY/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-signed-payment-header>" \
-d '{"address": "0xYourKlayWalletAddress"}'Example
Request
{
"address": "0x1234567890abcdef1234567890abcdef12345678"
}Endpoint
Quality
The endpoint is confirmed live via a valid 402 x402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, and all documentation pages are empty stubs. The request body and response format are entirely inferred.
Warnings
- —No API documentation available — /docs, /api, /pricing, and /README pages are all empty beyond a wallet-connect prompt
- —No OpenAPI or schema definition found; request body fields are guessed
- —Response schema is completely unknown — example_response_json is null
- —The provider hosts many endpoints with identical generic descriptions ('Premium API Access'), making it unclear how well-maintained each individual endpoint is
Citations
- —Endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/wallet/KLAY/balance
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Basehttps://lowpaymentfee.com