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 158. It is part of a broader platform offering pay-per-request 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/158/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 via the `exact` scheme, meaning the caller pays a fixed amount per request with no API keys, rate limits, or subscriptions required.
Documentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the balance response contains. The endpoint is confirmed live (returns a proper 402 challenge), but the actual functionality behind the paywall is undocumented. The platform advertises itself as offering low-fee, keyless API access on Base, but without documentation it is difficult to assess the quality or structure of the data returned.
Capabilities
Use cases
- —Querying account balance data without needing API keys or subscriptions
- —Demonstrating x402 protocol micropayment flows on Base
- —Integrating pay-per-request balance checks into automated agent workflows
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that need keyless, pay-per-call API access on Base
- —Low-volume balance lookups where subscription pricing is unnecessary
Not for
- —High-volume balance queries where per-request fees add up
- —Users who need detailed API documentation and response schemas before integrating
Quick start
# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.
# Without payment, it returns 402 with the challenge.
curl -X POST https://lowpaymentfee.com/api/v1/accounts/158/balance \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only a wallet-connect prompt. The actual data returned behind the paywall is completely undocumented, making this effectively a stub listing.
Warnings
- —No API documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'
- —No OpenAPI or JSON schema describing request parameters or response format
- —The specific purpose of account 158's balance endpoint is unclear — it may be a demo or placeholder
- —No response examples available; actual data structure behind the paywall is unknown
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/accounts/158/balance
- —Platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/accounts/158/balance
- —Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com