x402-gated account balance endpoint on Base, paid per-call in USDC.
What it does
This endpoint at lowpaymentfee.com provides a "Premium API Access" resource at the path `/api/v1/accounts/93/balance`. It is part of a broader platform that offers dozens of x402-payable API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints on the platform are priced at $0.02 per request, payable in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no signup required.
The specific endpoint probed (`/api/v1/accounts/93/balance`) returned a valid x402 challenge with `maxAmountRequired` of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this equals $0.02 per call, consistent with the platform's advertised pricing. The payment scheme is "exact" and settles to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The endpoint accepts POST requests and returns `application/json`.
Documentation on the site is extremely thin — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no explanation of what the balance response actually contains. The endpoint path suggests it returns an account balance for account ID 93, but the exact response format is unknown.
Capabilities
Use cases
- —Querying account balance data via a pay-per-call model without API key management
- —Integrating x402-compatible agents that autonomously pay for API access in USDC on Base
- —Demonstrating x402 protocol payment flows against a live endpoint
Fit
Best for
- —Developers experimenting with x402 protocol integrations
- —AI agents that need keyless, pay-per-call API access on Base
- —Projects requiring low-cost micropayment-gated endpoints
Not for
- —Production use cases requiring documented request/response schemas
- —High-volume batch queries where per-call pricing adds up
- —Users who need fiat-only payment options
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/93/balance
# Returns 402 with x402 challenge; include X-PAYMENT header with valid USDC payment to receive data.Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no explanation of what the balance endpoint actually returns. The docs pages are empty. This is effectively a stub listing.
Warnings
- —No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content
- —No OpenAPI or request/response schema provided; the actual response format for the balance endpoint is unknown
- —The purpose of 'account 93 balance' is unclear — it may be a demo or placeholder endpoint
- —No examples of successful responses are available
Citations
- —Platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/accounts/93/balance
- —Platform offers endpoints across data analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com