Check account balance via x402 micropayment on Base network for $0.02 per request.
What it does
This endpoint at lowpaymentfee.com returns account balance information for account ID 109. It is part of a broader platform offering pay-per-call APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories — all settled via the x402 protocol on the Base network using USDC.
The specific endpoint `/api/v1/accounts/109/balance` accepts POST requests and is gated behind an x402 payment challenge. The maximum amount required per call is 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 USD (USDC uses 6 decimals). Payment is made inline via the X-PAYMENT header — no API keys, subscriptions, or rate limits are advertised. The payment timeout is 300 seconds.
The platform's landing page lists numerous other endpoints at similar $0.02 price points spanning sentiment analysis, text summarization, embeddings, price feeds, gas estimates, geocoding, and more. Documentation pages beyond the landing page returned only a "Connect wallet" prompt with no further technical detail, so the exact request body schema and response format for this balance endpoint are unknown. The endpoint is live and returning a valid x402 challenge.
Capabilities
Use cases
- —Querying account balance information programmatically with per-request USDC payment
- —Integrating balance lookups into agent workflows without managing API keys
- —Demonstrating x402 protocol micropayment flows on Base
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents needing keyless, pay-per-call account balance data
- —Low-volume balance queries where subscription APIs are overkill
Not for
- —High-volume balance polling where per-request fees add up
- —Users who need detailed API documentation or guaranteed SLAs
- —Querying balances for arbitrary account IDs (endpoint is hardcoded to account 109)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/109/balance \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no OpenAPI schema, no documented request/response format, and all documentation pages beyond the landing page are empty stubs. The purpose of this specific endpoint (account 109 balance) is vague and the broader platform lacks substantive docs.
Warnings
- —No API documentation available — all doc pages return only 'Connect wallet' with no technical content
- —Request body schema and response format are completely undocumented
- —Endpoint is hardcoded to account ID 109; unclear what 'account' refers to or whether other IDs are accessible
- —Platform lists many endpoint categories but none have visible documentation beyond titles and prices
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/accounts/109/balance
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/accounts/109/balance
- —Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com