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 (account ID 151) behind an x402 paywall. It is part of a broader platform that advertises multiple API categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.
The specific endpoint `/api/v1/accounts/151/balance` accepts POST requests and returns JSON. The x402 challenge confirms it is live, requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with no API keys or rate limits required — callers simply attach an X-PAYMENT header with a valid payment proof.
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 spec, no request/response schema documentation, and no examples of what the balance response actually contains. The endpoint's purpose ("Premium API Access") and the account it references (ID 151) are not explained. Prospective users should be aware that the actual functionality behind this endpoint is unclear beyond the generic label.
Capabilities
Use cases
- —Querying account balance data for account 151 via a single paid API call
- —Demonstrating x402 payment protocol integration for per-request billing
- —Programmatic balance checks settled in USDC on Base
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents needing pay-per-call balance lookups without API key management
- —Low-volume, on-demand account balance queries
Not for
- —Users needing well-documented APIs with clear request/response schemas
- —High-volume balance monitoring where per-call fees add up
- —Anyone needing balance data for accounts other than ID 151
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/151/balance \
-H "X-PAYMENT: <x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no explanation of what the endpoint actually returns. The docs pages are empty. This is effectively a stub listing.
Warnings
- —No documentation available — all doc/API/pricing/README pages render only 'Connect wallet'
- —No OpenAPI or request/response schema provided
- —The purpose of 'account 151 balance' is unexplained; unclear what data is returned
- —The broader platform lists many endpoints but none have documented schemas
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/accounts/151/balance
- —The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com
- —Docs, API, pricing, and README pages all show only 'Connect wallet' with no further contenthttps://lowpaymentfee.com/docs