Query DOT wallet balances via x402 micropayment — $0.02 per request on Base.
What it does
This endpoint at lowpaymentfee.com returns Polkadot (DOT) wallet balance data, accessible through the x402 payment protocol. Each call costs $0.02 (20,000 base units of USDC on Base network, where USDC has 6 decimals). No API keys or accounts are required — callers simply attach an x402 payment header with each request.
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 infrastructure utilities. All endpoints share the same $0.02/request pricing model and settle payments on the Base L2 network using USDC (contract 0x8335…2913). The x402 challenge confirms the endpoint is live, accepts POST requests, and returns application/json responses.
Documentation beyond the landing page 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 documentation, and no example payloads available. The exact request body format and response structure for the DOT balance endpoint must be inferred or discovered experimentally.
Capabilities
Use cases
- —Checking the DOT balance of a Polkadot wallet address programmatically
- —Integrating DOT balance lookups into trading bots or portfolio trackers
- —Agent-driven portfolio monitoring that pays per query with no subscription
Fit
Best for
- —Developers needing on-demand DOT balance queries without API key management
- —AI agents that can settle x402 micropayments on Base
- —Low-volume or sporadic crypto balance lookups where per-call pricing is preferable to subscriptions
Not for
- —High-frequency balance polling where $0.02/request adds up quickly
- —Users who need detailed DOT transaction history or staking info (not documented)
- —Anyone requiring comprehensive multi-chain wallet analytics in a single call
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wallet/DOT/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{"address": "1FRMM8PEiWXYax7rpS6X4XZX1aAAxSWx1CrKTyrVYhV24fg"}'Example
Request
{
"address": "1FRMM8PEiWXYax7rpS6X4XZX1aAAxSWx1CrKTyrVYhV24fg"
}Endpoint
Quality
The x402 challenge confirms the endpoint is live and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, and all documentation pages are empty beyond a wallet-connect prompt. The request and response examples are inferred, not sourced.
Warnings
- —No OpenAPI or schema documentation available — request/response format is unknown and must be discovered experimentally
- —All doc pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no technical content
- —Example request JSON is inferred (not sourced) based on the endpoint path pattern
- —The broader lowpaymentfee.com platform lists many endpoints but provides no verifiable documentation for any of them
Citations
- —Endpoint returns 402 with x402 challenge confirming it is live and accepts POSThttps://lowpaymentfee.com/api/v1/wallet/DOT/balance
- —Price is 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network, equaling $0.02https://lowpaymentfee.com/api/v1/wallet/DOT/balance
- —All APIs priced at $0.02/request with no API keys, no rate limits, settling on Base networkhttps://lowpaymentfee.com
- —Documentation pages render only 'Connect wallet' with no additional contenthttps://lowpaymentfee.com/docs