x402-gated account balance endpoint on Base, pay-per-call with USDC.
What it does
This endpoint at lowpaymentfee.com provides a "Premium API Access" account balance resource at `/api/v1/accounts/148/balance`. It is part of a broader platform offering dozens of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated via the x402 payment protocol on the Base network.
The specific endpoint probed accepts POST requests and charges up to $0.02 per call (20,000 base units of USDC, which has 6 decimals). Payment is settled on-chain in USDC (contract `0x8335…2913` on Base) to the payee address `0x1A2B…85F3`. No API keys or rate limits are advertised; access is granted purely through the x402 payment header. The platform's landing page lists a uniform $0.02/request price across all endpoints.
The exact response schema for this particular endpoint (`/accounts/148/balance`) is not documented in the crawled material. The endpoint path suggests it returns an account balance for account ID 148, but no further details on the response payload, required request body fields, or error codes are available. The docs, pricing, and API pages all returned only a "Connect wallet" prompt with no additional documentation. This makes the endpoint functional but poorly documented for programmatic integration.
Capabilities
Use cases
- —Querying account balance data via a single paid API call
- —Integrating pay-per-request balance lookups into agent workflows
- —Demonstrating x402 protocol payment flows on Base
Fit
Best for
- —Agents or services that need on-demand account balance data without API key management
- —Developers experimenting with x402 payment-gated APIs
- —Micropayment-based API consumption on Base L2
Not for
- —Users needing detailed API documentation or response schemas before integrating
- —High-volume batch queries where per-request pricing may add up
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/148/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation on request/response schemas, no OpenAPI spec, and the docs pages are empty beyond a wallet-connect prompt. The purpose of this specific endpoint (account 148 balance) is unclear.
Warnings
- —No API documentation available — docs, pricing, and API pages all show only 'Connect wallet'
- —No request body schema or response schema documented for this endpoint
- —The endpoint path references a specific account ID (148); unclear if this is parameterizable or a fixed demo
- —The broader platform lists many endpoints but none appear to have public documentation
Citations
- —The endpoint returns a 402 x402 challenge requesting up to 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/accounts/148/balance
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/accounts/148/balance
- —Platform advertises $0.02/request uniform pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com