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 specified account (account ID 10 in the probed URL). It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories — all settled via the x402 protocol on the Base network using USDC.
The endpoint accepts POST requests and is gated by an x402 payment challenge. Each call costs $0.02 (20,000 base units of USDC with 6 decimals) paid to the provider's wallet on Base. No API keys, rate limits, or upfront commitments are required — callers simply attach the appropriate X-PAYMENT header with a valid x402 payment proof. The response MIME type is application/json.
The specific functionality of this particular endpoint — account balance retrieval — is not extensively documented beyond its title "Premium API Access." The broader platform lists 16+ endpoints spanning sentiment analysis, text summarization, embeddings, price feeds, gas estimates, geocoding, and more, all at the same $0.02/request price point. Documentation pages (docs, pricing, README) returned only a "Connect wallet" prompt with no additional technical detail, so the exact request body schema and response fields for this endpoint remain unknown.
Capabilities
Use cases
- —Querying account balance data programmatically with per-request USDC micropayments
- —Integrating balance checks into agent workflows without managing API keys
- —Demonstrating x402 protocol payment flows on Base network
Fit
Best for
- —Developers experimenting with x402 pay-per-request APIs
- —Agents needing keyless, on-demand account balance lookups
- —Projects already operating on the Base L2 with USDC
Not for
- —Users needing detailed API documentation or schema guarantees before integration
- —High-volume balance polling where per-request fees would accumulate significantly
- —Users without a Base network wallet or USDC holdings
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/10/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no documented request/response format, and all documentation pages returned only 'Connect wallet' with no useful content. The specific purpose of this endpoint beyond its generic title is unclear.
Warnings
- —No request body schema or response schema documented — callers must discover the interface by trial
- —All documentation pages (/docs, /pricing, /README, /api) returned only 'Connect wallet' with no technical content
- —The endpoint path suggests a hardcoded account ID (10); it is unclear whether other account IDs are supported or what authorization model applies
- —The platform lists many endpoints but none appear to have public documentation beyond titles and prices
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/accounts/10/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
- —The platform offers 16+ endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —The asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 corresponds to USDC on Basehttps://lowpaymentfee.com/api/v1/accounts/10/balance