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/160/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 sign-up required.
The specific endpoint probed (`/api/v1/accounts/160/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 with a 300-second timeout.
Documentation on the site is extremely thin — 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 the URL path. The platform appears functional and live, but the lack of documentation makes it difficult to assess the actual utility or data quality of this specific endpoint.
Capabilities
Use cases
- —Querying account balance data with per-request USDC micropayments
- —Integrating pay-per-call balance lookups into agent workflows
- —Accessing financial data without API key registration
Fit
Best for
- —Agents or developers wanting zero-signup API access paid in USDC
- —Micropayment-based API consumption on Base L2
- —Quick prototyping without rate limit concerns
Not for
- —Users needing detailed API documentation or response schemas before integrating
- —High-volume consumers who need bulk pricing or subscription plans
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/160/balance \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation beyond a landing page listing, no request/response schema, and no examples. The specific purpose of this endpoint is only inferable from the URL path. Docs pages are empty.
Warnings
- —No API documentation available — docs, pricing, and README pages all show only 'Connect wallet' with no content
- —No request or response schema provided; the actual data returned by this endpoint is unknown
- —The endpoint path suggests account-specific data (/accounts/160/balance) but no details on what 'account 160' represents
- —No OpenAPI spec or ai-plugin manifest found
Citations
- —Platform advertises $0.02 per request pricing with no API keys, no rate limits, and Base network settlementhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/accounts/160/balance
- —Platform lists endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com