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 (ID 142) via an x402-gated POST request. Payment is settled in USDC on the Base network at $0.02 per call (20,000 base units with 6 decimals). No API keys or rate limits are required — access is granted purely through the x402 payment protocol.
The provider lowpaymentfee.com hosts a broader suite of pay-per-call APIs spanning data analytics, AI/ML inference (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 and settle on the Base network using USDC.
Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the balance response payload looks like. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the actual functionality and response format must be inferred from the endpoint path alone.
Capabilities
Use cases
- —Querying account balance information programmatically via micropayment
- —Integrating balance checks into agent workflows without API key management
- —Demonstrating x402 payment protocol usage on Base network
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents needing keyless, pay-per-call account balance lookups
- —Low-volume balance queries where $0.02/request is acceptable
Not for
- —High-volume balance monitoring requiring bulk/subscription pricing
- —Users needing detailed API documentation or guaranteed SLAs
- —Production systems requiring well-documented response schemas
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/142/balance \
-H "X-PAYMENT: <x402_payment_token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The actual response payload and input parameters are unknown.
Warnings
- —No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'
- —No OpenAPI or output schema provided; response format is completely unknown
- —The specific endpoint path (/accounts/142/balance) suggests a hardcoded account ID with unclear general utility
- —Provider hosts many listed endpoints but none have documented schemas or examples
Citations
- —Endpoint returns 402 with x402 challenge requiring USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/accounts/142/balance
- —maxAmountRequired is 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02https://lowpaymentfee.com/api/v1/accounts/142/balance
- —All endpoints priced at $0.02/request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Provider lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com