x402-gated account balance endpoint on Base, pay-per-call with USDC.
What it does
This endpoint at lowpaymentfee.com provides a pay-per-request "Premium API Access" resource at the path `/api/v1/accounts/197/balance`. It is part of a broader platform that offers dozens of x402-gated API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request and settled in USDC on the Base network.
The specific endpoint probed (`/api/v1/accounts/197/balance`) returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals) per call. Payment is made via the x402 protocol's `exact` scheme, with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`. No API keys or rate limits are advertised — access is gated purely by micropayment.
Documentation on the site is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the balance endpoint actually returns. The endpoint's purpose (account balance lookup) can only be inferred from its URL path. The broader platform lists many endpoints but provides no detailed documentation for any of them.
Capabilities
Use cases
- —Querying account balance data via micropayment without API key registration
- —Integrating pay-per-call balance lookups into agent workflows on Base
- —Demonstrating x402 protocol payment flows for API access
Fit
Best for
- —Developers experimenting with x402 micropayment-gated APIs
- —Agents that need keyless, pay-per-call API access on Base
- —Projects exploring USDC micropayment infrastructure
Not for
- —Production use cases requiring documented request/response schemas
- —Users who need free or subscription-based API access
- —Applications requiring high-throughput batch balance queries with SLAs
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/197/balance \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, but there is zero documentation on request parameters, response schema, or what 'account 197 balance' actually represents. No OpenAPI spec, no examples, and all doc pages are empty. The listing is effectively a stub.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content
- —No OpenAPI or request/response schema provided for this endpoint
- —The purpose of '/api/v1/accounts/197/balance' is unclear — it is not obvious what 'account 197' refers to or what data is returned
- —The broader platform lists many endpoints but none have documented schemas or examples
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network with exact schemehttps://lowpaymentfee.com/api/v1/accounts/197/balance
- —The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Docs, API, pricing, and README pages render only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs