x402-gated account balance endpoint on Base, paid per-call in USDC.
What it does
This endpoint at lowpaymentfee.com provides a "Premium API Access" account balance lookup via the x402 payment protocol. It is part of a broader platform that advertises multiple API categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all gated behind x402 micropayments settled in USDC on the Base network.
The specific endpoint `/api/v1/accounts/83/balance` accepts POST requests and returns JSON. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform advertises uniform $0.02/request pricing across all endpoints, with no API keys, no rate limits, and no minimum commitments required.
Documentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no explanation of what the "account balance" endpoint actually returns or what parameters it expects. The endpoint is confirmed live (402 challenge captured), but the lack of documentation makes it difficult to use without experimentation.
Capabilities
Use cases
- —Querying account balance information via a pay-per-call model
- —Integrating x402-compatible agents with USDC micropayments on Base
- —Accessing premium data without API key registration
Fit
Best for
- —Agents or wallets that support x402 payment protocol on Base
- —Developers wanting zero-signup, pay-per-use API access
- —Micropayment-based workflows where $0.02/call is acceptable
Not for
- —Users needing detailed API documentation or request/response schemas before integrating
- —High-volume use cases where per-call pricing may add up without bulk discounts
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/83/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 ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the endpoint actually does beyond the generic label "Premium API Access". The docs, pricing, and README pages are all empty. This is effectively a stub listing.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content
- —No OpenAPI or request/response schema provided; request parameters and response format are unknown
- —The endpoint path '/api/v1/accounts/83/balance' suggests a hardcoded account ID (83) — unclear if this is parameterizable
- —The generic description 'Premium API Access' gives no indication of what data is actually returned
Citations
- —The x402 challenge requires a maximum of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/accounts/83/balance
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt with no substantive contenthttps://lowpaymentfee.com/docs