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 a specific account (account ID 31) via the x402 payment protocol. It is part of a broader platform offering data & analytics, AI/ML inference, finance/Web3, and infrastructure utility APIs, all priced at $0.02 per request and settled in USDC on the Base network.
The endpoint accepts POST requests and requires an X-PAYMENT header conforming to x402 version 1 with the "exact" payment scheme. The maximum amount required is 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The response MIME type is application/json.
The platform advertises no API keys, no rate limits, and instant access. Documentation pages (/docs, /pricing, /README) appear to require a wallet connection and contain no additional readable content. Because of this, the actual response schema and request body format for this specific balance endpoint are unknown — only the x402 payment challenge has been captured. The endpoint is live and returning a proper 402 challenge.
Capabilities
Use cases
- —Querying account balance data with per-request USDC micropayments
- —Integrating pay-as-you-go balance lookups into agent workflows
- —Accessing financial account information without API key registration
Fit
Best for
- —Agents that can settle x402 payments in USDC on Base
- —Use cases needing low-cost, keyless account balance queries
- —Developers prototyping x402 payment flows
Not for
- —Users who need detailed API documentation or response schemas before integrating
- —High-throughput batch queries where per-request payment overhead is impractical
- —Users without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/31/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, but there is no OpenAPI schema, no documentation of request/response formats, and the docs/pricing/README pages are empty (wallet-gated). The specific purpose of 'account 31 balance' is unclear. Effectively a stub listing.
Warnings
- —No request body schema or response schema available — actual payload format is unknown
- —Documentation pages (/docs, /pricing, /README) are wallet-gated and contain no readable content
- —The specific meaning of 'accounts/31/balance' is undocumented; it is unclear what account or balance type this refers to
- —The platform lists many endpoints but none have detailed documentation visible without wallet connection
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/accounts/31/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
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/accounts/31/balance