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 lookup via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which advertises a suite of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all gated behind x402 micropayments settled in USDC on the Base network.
The specific endpoint `/api/v1/accounts/46/balance` accepts POST requests and returns JSON. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform's landing page confirms a flat $0.02/request pricing model across all endpoints, with no API keys, no rate limits, and no minimum commitments required.
Documentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The exact semantics of "account 46 balance" are unclear: it is not documented whether this returns a crypto wallet balance, a platform account balance, or something else entirely. The endpoint is confirmed live (402 challenge returned successfully), but without documentation the actual utility is difficult to assess.
Capabilities
Use cases
- —Querying account balance information via a single paid API call
- —Integrating pay-per-use balance checks into agent workflows
- —Demonstrating x402 protocol micropayment flows
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents needing no-auth, pay-per-call balance lookups
- —Projects that want to avoid API key management
Not for
- —Production use cases requiring documented request/response schemas
- —Users who need free or subscription-based API access
- —Anyone needing detailed API documentation before integration
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/46/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no explanation of what 'accounts/46/balance' actually returns. Pricing is clear ($0.02/request) but the endpoint's actual utility cannot be verified.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet'
- —No OpenAPI or schema definition found for request or response payloads
- —The meaning of 'accounts/46/balance' is undocumented — unclear what data is returned
- —The platform lists many endpoints but none appear to have public documentation
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/accounts/46/balance
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and no minimumshttps://lowpaymentfee.com
- —USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/accounts/46/balance
- —Documentation pages (/docs, /pricing, /api, /README) show only 'Connect wallet'https://lowpaymentfee.com/docs