Query THETA wallet balance via x402 micropayment on Base for $0.02 per request.
What it does
This endpoint at lowpaymentfee.com returns the wallet balance for the THETA token. It is part of a broader suite of pay-per-call APIs offered by the same provider, spanning data analytics, AI/ML inference, finance/Web3, and utility services. All endpoints use the x402 payment protocol, settling in USDC on the Base network.
The specific endpoint `/api/v1/wallet/THETA/balance` accepts POST requests and returns JSON. Each call costs a maximum of 20,000 base units of USDC (6 decimals), which equals $0.02. Payment is handled via the x402 `exact` scheme — no API keys, subscriptions, or rate limits are required. The provider advertises instant access and a uniform $0.02/request price across all their endpoints.
Documentation is extremely sparse. The provider's docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples. The endpoint is confirmed live (returns a proper 402 challenge), but the actual response format and accepted request parameters are unknown.
Capabilities
Use cases
- —Checking the current THETA token balance of a wallet address
- —Building portfolio trackers that need on-demand balance lookups
- —Automated trading bots that verify wallet holdings before executing trades
Fit
Best for
- —Agents needing on-demand THETA wallet balance without API key management
- —Micropayment-based crypto data queries on Base
- —Low-friction, pay-as-you-go blockchain data access
Not for
- —High-volume balance polling where $0.02/request adds up quickly
- —Users needing detailed transaction history or multi-token batch queries
- —Anyone requiring comprehensive API documentation before integration
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wallet/THETA/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>" \
-d '{"address": "0x..."}'Example
Request
{
"address": "0x1234567890abcdef1234567890abcdef12345678"
}Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no documentation beyond a landing page listing, no response schema, and no examples. The request body format is entirely inferred. This is effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'
- —No OpenAPI or output schema provided; request and response formats are unknown
- —The example request JSON is inferred and may not match the actual expected input
- —Provider offers many endpoints but none have documented schemas
Citations
- —Endpoint returns 402 with x402 challenge advertising USDC on Base network, maxAmountRequired 20000 base unitshttps://lowpaymentfee.com/api/v1/wallet/THETA/balance
- —Provider advertises $0.02/request uniform pricing, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/wallet/THETA/balance