Check account balance via x402 micropayment on Base network for $0.02 per request.
What it does
This endpoint at lowpaymentfee.com returns account balance information for a specified account (account ID 69 in this case). It is part of a broader suite of pay-per-call APIs offered by lowpaymentfee.com, all settled via the x402 protocol using USDC on the Base network.
The endpoint accepts POST requests and requires an X-PAYMENT header containing a valid x402 payment proof. The price per call is $0.02 (20,000 base units of USDC with 6 decimals). No API keys or rate limits are advertised — access is gated purely by micropayment. The response MIME type is application/json.
lowpaymentfee.com also offers endpoints across data/analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation), all at the same $0.02/request price point. Documentation pages beyond the landing page were largely empty (showing only a "Connect wallet" prompt), so details about request/response schemas for this specific balance endpoint are not available.
Capabilities
Use cases
- —Querying account balance information programmatically with per-call payment
- —Integrating balance checks into agent workflows without pre-registration or API keys
- —Demonstrating x402 micropayment protocol usage on Base network
Fit
Best for
- —Agents needing on-demand account balance data without subscription commitments
- —Developers experimenting with x402 protocol micropayments
- —Low-volume or sporadic balance lookups where pay-per-call is cost-effective
Not for
- —High-frequency balance polling where per-call costs would accumulate quickly
- —Users who need detailed documentation or guaranteed SLAs before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/69/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no request/response body documentation, and all doc/pricing/API pages beyond the landing page are empty stubs. The specific purpose of the balance endpoint is only inferable from its URL path. This is effectively a stub listing.
Warnings
- —No request or response schema available — the endpoint's exact input parameters and output format are unknown.
- —Documentation pages (/docs, /api, /pricing, /README) are empty, showing only a wallet-connect prompt.
- —The specific account ID '69' is hardcoded in the endpoint path; it is unclear whether other account IDs are supported or what 'balance' returns.
- —The broader lowpaymentfee.com platform lists many endpoints but provides no detailed documentation for any of them.
Citations
- —The endpoint returns HTTP 402 with x402 version 1 challenge requiring USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/accounts/69/balance
- —Price is $0.02 per request (maxAmountRequired 20000 base units of USDC, 6 decimals)https://lowpaymentfee.com/api/v1/accounts/69/balance
- —The site advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Basehttps://lowpaymentfee.com/api/v1/accounts/69/balance