x402-gated account balance endpoint on Base, paying $0.02 per request in 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/13/balance` is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints on the platform are priced at $0.02 per request, settled in USDC on the Base network with no API keys, rate limits, or commitments required.
The x402 challenge confirms the endpoint is live, accepting POST requests and requiring an exact payment of 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base). Since USDC uses 6 decimals, this equals $0.02 per call. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a maximum timeout of 300 seconds. The response MIME type is application/json.
Note that the specific functionality of the `/accounts/13/balance` endpoint is not well-documented beyond the generic label "Premium API Access." The broader platform lists categories like analytics metrics, AI sentiment analysis, text summarization, price feeds, geocoding, and more — all at the same $0.02 price point. Documentation pages (docs, pricing, README) returned only a wallet-connect prompt with no substantive content, so the actual request/response schemas for this and other endpoints remain unknown.
Capabilities
Use cases
- —Querying account balance data with per-call USDC micropayments
- —Integrating keyless, pay-as-you-go API access into agent workflows
- —Accessing financial or account data without subscription commitments
Fit
Best for
- —Agents or bots that need keyless, on-demand API access
- —Developers testing x402 payment protocol integrations
- —Low-volume consumers who prefer per-call pricing over subscriptions
Not for
- —High-volume batch processing where per-call costs add up quickly
- —Users who need detailed API documentation or guaranteed SLAs
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/13/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no documentation of request parameters, response schema, or what 'accounts/13/balance' actually returns. All doc/pricing/README pages are empty beyond a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —No request or response schema documented — actual payload structure is unknown
- —All documentation pages (docs, pricing, README) returned only a wallet-connect prompt with no content
- —The specific purpose of /api/v1/accounts/13/balance is unclear; 'Premium API Access' is a generic label
- —The platform lists many endpoint categories but none have detailed documentation available
Citations
- —Endpoint returns 402 with x402 challenge requiring 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/accounts/13/balance
- —All endpoints priced at $0.02 per request with no API keys, rate limits, or commitmentshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/accounts/13/balance
- —Platform offers APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com