x402-gated account balance endpoint on Base, pay $0.02 per request in 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/198/balance` is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints on the platform are priced at $0.02 per request, settled in USDC on the Base network.
The x402 challenge confirms the endpoint is live and accepts POST requests. Payment is made via the x402 "exact" scheme, requiring up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a maximum timeout of 300 seconds. No API keys or rate limits are advertised; access is purely pay-per-request.
Documentation is extremely sparse — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the balance response actually contains. The endpoint path suggests it returns balance information for account ID 198, but the exact schema and semantics are unknown.
Capabilities
Use cases
- —Querying account balance data for account 198 via a single paid API call
- —Integrating pay-per-request balance lookups into agent workflows without API key management
- —Demonstrating x402 protocol payment flows on Base network
Fit
Best for
- —Developers experimenting with x402 payment protocol integrations
- —Agents needing keyless, pay-per-call API access on Base
- —Low-volume balance queries where subscription pricing is unnecessary
Not for
- —High-volume balance queries where per-call pricing adds up quickly
- —Users who need detailed API documentation or guaranteed SLAs
- —Anyone needing balance data for arbitrary accounts (this endpoint is scoped to account 198)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/198/balance \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of this specific endpoint (account 198 balance) is opaque. The docs pages are empty beyond a wallet connect prompt.
Warnings
- —No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'
- —No OpenAPI or JSON schema describing request parameters or response format
- —The endpoint is scoped to a single account ID (198); unclear if other account IDs are accessible
- —No information on uptime, SLAs, or rate limits beyond marketing claims of 'no rate limits'
Citations
- —The endpoint returns HTTP 402 with an x402 challenge requiring up to 20,000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/accounts/198/balance
- —All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/accounts/198/balance