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 193) behind an x402 paywall. It is part of a broader platform offering dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request and settled in USDC on the Base network.
The endpoint accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers must include an X-PAYMENT header with a valid payment proof. The x402 challenge specifies an exact-scheme payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
The platform advertises no API keys, no rate limits, and instant access. Documentation pages (/docs, /pricing, /api, /README) all appear to require a wallet connection and contain no substantive content in the crawl. As a result, the actual response schema, request parameters, and detailed behavior of this specific balance endpoint are unknown. The endpoint is confirmed live (402 challenge returned successfully).
Capabilities
Use cases
- —Querying account balance data programmatically with per-call USDC micropayments
- —Integrating balance checks into automated agent workflows without API key management
- —Building dashboards that pull account balance information on demand
Fit
Best for
- —Agents or services that need on-demand account balance lookups with no subscription commitment
- —Developers wanting frictionless pay-per-call access without API key registration
- —Crypto-native workflows already operating on the Base network with USDC
Not for
- —High-volume balance polling where $0.02 per request adds up quickly
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —Applications requiring non-USDC or non-Base-network payment rails
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/193/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, but there is no OpenAPI schema, no documented request/response format, and all documentation pages returned only a wallet-connect prompt with no content. The actual functionality of the balance endpoint is inferred solely from its URL path and the generic platform description.
Warnings
- —No documentation content available — all doc pages require wallet connection and returned no useful text
- —Request body schema and response schema are completely unknown
- —The specific purpose of 'account 193 balance' is unclear — it may be a demo or placeholder endpoint
- —Platform lists many endpoints but none have detailed docs in the crawl
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/accounts/193/balance
- —Platform pricing is $0.02 per request 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/193/balance