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 account ID 108. It is part of a broader platform offering various pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints on the platform are gated behind the x402 payment protocol, settling in USDC on the Base network.
The specific endpoint `/api/v1/accounts/108/balance` accepts POST requests and requires an X-PAYMENT header conforming to x402 version 1. The maximum amount required per call is 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 given USDC's 6 decimal places. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the "exact" scheme, with a timeout of 300 seconds.
The platform advertises no API keys, no rate limits, and instant access. Documentation pages (/docs, /pricing, /README) appear to require a wallet connection and contain no additional readable content. There is no OpenAPI schema, no detailed documentation about request/response formats, and no information about what the "balance" response actually contains. The endpoint is confirmed live (returns 402 challenge as expected), but the lack of documentation makes it difficult to know what data is returned or what input parameters the POST body expects.
Capabilities
Use cases
- —Querying account balance information programmatically with per-call USDC micropayments
- —Integrating balance checks into agent workflows without API key management
- —Demonstrating x402 protocol payment flows 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 subscription pricing is unnecessary
Not for
- —High-volume balance monitoring requiring bulk or subscription pricing
- —Users who need detailed API documentation before integrating
- —Applications requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/108/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no documentation of request/response formats, and the docs/pricing/README pages are all behind a wallet gate with no readable content. The purpose of this specific endpoint (account 108 balance) is vague and undocumented.
Warnings
- —No OpenAPI or schema documentation available for request or response formats
- —All documentation pages (/docs, /pricing, /README) require wallet connection and provide no readable content
- —The specific meaning of 'account 108 balance' is undocumented — unclear what data is returned
- —No examples of successful responses are available
- —The broader platform lists many API categories but it is unclear which endpoints are fully functional
Citations
- —The endpoint returns a 402 challenge with x402 version 1, requiring USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/accounts/108/balance
- —Maximum amount required is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02https://lowpaymentfee.com/api/v1/accounts/108/balance
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com