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/101/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/101/balance`) returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 protocol (version 1) using the "exact" scheme, with a 300-second timeout. The response MIME type is `application/json`. No API keys or rate limits are advertised; access is granted purely through per-call micropayments.
Documentation on the site is extremely thin — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint name ("accounts/101/balance") suggests it returns balance information for a specific account, but the exact request body format and response structure are unknown.
Capabilities
Use cases
- —Querying account balance data with per-call USDC micropayments
- —Integrating pay-as-you-go financial data into agent workflows
- —Demonstrating x402 protocol payment flows on Base
Fit
Best for
- —Developers experimenting with x402 micropayment protocols
- —Agents that need on-demand account balance lookups without API key management
- —Low-volume, pay-per-use access to financial data
Not for
- —High-volume production workloads requiring documented SLAs and schemas
- —Users who need detailed API documentation or client libraries before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/101/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it is operational. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of this specific endpoint (account balance for account 101) is only inferable from the URL path. Effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'
- —No OpenAPI or JSON schema for request or response bodies
- —The specific functionality of /api/v1/accounts/101/balance is inferred solely from the URL path
- —The broader platform advertises many endpoints but none have documented schemas
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)https://lowpaymentfee.com/api/v1/accounts/101/balance
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base networkhttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com