x402-gated account balance endpoint on Base, pay-per-call with USDC.
What it does
This endpoint at lowpaymentfee.com provides a "Premium API Access" account balance resource at `/api/v1/accounts/54/balance`. It is part of a broader platform offering dozens of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated via the x402 payment protocol on the Base network.
The specific endpoint probed returns an x402 challenge requesting payment in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base) with a `maxAmountRequired` of 20,000 base units. Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the platform's advertised flat pricing of $0.02/request across all endpoints. Payment is made via the `exact` scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.
The platform advertises no API keys, no rate limits, and instant access. However, documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all resolve to a minimal "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no documentation explaining what the account balance endpoint actually returns or what input parameters it expects. The exact purpose of "account 54 balance" is unclear — it may be a demo or placeholder resource.
Capabilities
Use cases
- —Querying account balance data via a single paid API call
- —Demonstrating x402 payment protocol integration on Base
- —Agent-driven pay-per-request data retrieval without API key management
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that need keyless, pay-per-call API access on Base
- —Projects requiring USDC-settled micropayment endpoints
Not for
- —Production use cases requiring documented request/response schemas
- —Users needing free or subscription-based API access
- —Applications requiring high-throughput with predictable billing
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/54/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of the specific '/accounts/54/balance' resource is unexplained. All doc pages return only 'Connect wallet' with no content.
Warnings
- —No documentation available — all doc pages (/docs, /pricing, /api, /README) show only 'Connect wallet'
- —No OpenAPI or request/response schema provided
- —The specific endpoint '/api/v1/accounts/54/balance' purpose is unclear — may be a demo or placeholder
- —No examples of expected input or output format
Citations
- —Platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base (= $0.02)https://lowpaymentfee.com/api/v1/accounts/54/balance
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/accounts/54/balance
- —Platform offers endpoints across data analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com