x402-gated account balance endpoint on Base, pay-per-call with USDC.
What it does
This endpoint at lowpaymentfee.com provides an account balance lookup via the x402 payment protocol. The specific resource `/api/v1/accounts/156/balance` is gated behind a per-request USDC payment on the Base network. The x402 challenge confirms the endpoint is live and accepts exact-scheme payments of up to 20,000 base units of USDC (0.02 USD per request) to a specified wallet address.
The broader lowpaymentfee.com platform advertises a suite of APIs spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and instant access via x402 on the Base network.
However, the specific endpoint being listed here — `/api/v1/accounts/156/balance` — does not appear in the platform's publicly listed API catalog. It may be an internal or account-specific resource. Documentation beyond the landing page is effectively empty (all sub-pages just show "Connect wallet"), so the actual response schema, required POST body, and precise behavior of this endpoint are unknown.
Capabilities
Use cases
- —Querying account balance information via a pay-per-request model
- —Integrating x402-gated API calls into agent workflows on Base
- —Accessing financial data without traditional API key management
Fit
Best for
- —Agents or services that can settle USDC payments on Base
- —Developers wanting zero-signup, pay-per-call API access
- —Prototyping x402 payment flows
Not for
- —Users needing detailed API documentation or response schemas before integration
- —High-volume use cases where per-request pricing may add up
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/156/balance
# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment to access.Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the specific endpoint path does not appear in the provider's public API catalog. All documentation pages return only 'Connect wallet' with no useful content.
Warnings
- —The endpoint /api/v1/accounts/156/balance is not listed in the provider's public API catalog — it may be an internal or account-specific resource.
- —All documentation pages (/docs, /api, /pricing, /README) are effectively empty, showing only 'Connect wallet'.
- —No request body schema or response schema is available; the actual behavior of this endpoint is unknown.
- —The platform lists many API categories (AI, analytics, finance, utilities) but none can be verified due to absent documentation.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/accounts/156/balance
- —The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Documentation pages (/docs, /api, /pricing, /README) contain only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs