x402-gated account balance endpoint on Base, pay-per-call with 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/173/balance` is gated behind an x402 challenge requiring payment in USDC on the Base network. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. Payment is made via the "exact" scheme to a specified wallet address, with a timeout of 300 seconds.
The broader lowpaymentfee.com platform advertises a suite of x402-gated APIs spanning data & analytics (metrics, reports, data export, insights), AI & machine learning (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments.
However, the specific endpoint being listed here — `/api/v1/accounts/173/balance` — is not among the publicly documented APIs on the landing page. It appears to be an account-specific balance query, possibly for internal or account-management purposes. No OpenAPI schema, request/response examples, or detailed documentation were found for this endpoint. The docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content.
Capabilities
Use cases
- —Querying account balance information via a pay-per-call model
- —Integrating x402-gated balance checks into automated agent workflows
- —Accessing account data without traditional API key provisioning
Fit
Best for
- —Agents or services that need on-demand account balance lookups with crypto micropayments
- —Developers experimenting with x402 payment protocol integrations
- —Use cases requiring keyless, pay-as-you-go API access on Base
Not for
- —Users needing detailed API documentation or response schema guarantees before integration
- —High-volume balance queries where per-call pricing may add up
- —Anyone without a USDC wallet on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/173/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, this specific endpoint is not documented on the site, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The purpose and output of this particular endpoint are unclear.
Warnings
- —This specific endpoint (/api/v1/accounts/173/balance) is not listed among the publicly documented APIs on the provider's landing page.
- —No OpenAPI schema, request body format, or response schema is available.
- —All documentation pages (docs, API, pricing, README) returned only a 'Connect wallet' prompt with no substantive content.
- —The endpoint's actual functionality and response format are unknown — it may be an internal or account-specific resource.
Citations
- —The x402 challenge requires maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/accounts/173/balance
- —All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com