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 specific account (ID 119) behind an x402 paywall. It is part of a broader platform offering dozens of pay-per-call API endpoints across data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.
The specific endpoint `/api/v1/accounts/119/balance` is accessed via HTTP POST and requires an X-PAYMENT header containing a valid x402 payment proof. The x402 challenge confirms the endpoint is live, accepting USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). No API keys or rate limits are advertised; access is gated purely by per-request micropayment.
Documentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the balance response contains. The platform's landing page lists many endpoints but provides no technical documentation beyond endpoint paths and prices. As a result, the exact shape of the response and the meaning of "account 119 balance" remain unclear.
Capabilities
Use cases
- —Querying account balance data with per-request USDC micropayment
- —Integrating pay-per-call balance lookups into agent workflows
- —Demonstrating x402 protocol payment flows on Base
Fit
Best for
- —Developers experimenting with x402 micropayment protocols
- —Agents needing on-demand account balance data without API key management
- —Low-volume, pay-as-you-go API consumption on Base network
Not for
- —Users needing detailed API documentation or response schemas before integrating
- —High-volume balance queries where per-request fees add up quickly
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/119/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation: no OpenAPI schema, no request/response examples, no explanation of what 'accounts/119/balance' returns. Docs pages are empty. This is effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content
- —No request or response schema provided; the meaning of 'account 119 balance' is unknown
- —No OpenAPI spec or ai-plugin manifest found
- —The endpoint path is hardcoded to account ID 119; unclear if other account IDs are supported
Citations
- —The endpoint returns HTTP 402 with an x402 challenge requiring USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/accounts/119/balance
- —All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/accounts/119/balance
- —maxAmountRequired is 20000 base units, which equals $0.02 for USDC (6 decimals)https://lowpaymentfee.com/api/v1/accounts/119/balance