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 via the x402 payment protocol. The specific resource `/api/v1/accounts/122/balance` is described as "Premium API Access" and accepts POST requests. Payment is settled in USDC on the Base network using the x402 "exact" scheme, with a maximum cost of $0.02 per request (20,000 base units of USDC at 6 decimals).
The broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance and crypto market data, and infrastructure utilities (geocoding, validation, conversion, generation) — all priced at $0.02 per request. The platform emphasizes no API keys, no rate limits, and instant access via x402 on Base.
However, this specific endpoint (`/accounts/122/balance`) does not clearly map to any of the documented API categories on the landing page. There is no OpenAPI schema, no request/response documentation, and the docs, pricing, and API pages all render only a "Connect wallet" prompt with no further content. The actual behavior and response format of this endpoint remain unknown beyond what the x402 challenge reveals.
Capabilities
Use cases
- —Querying account balance data via a pay-per-call model without API keys
- —Integrating x402-compatible agents that settle payments in USDC on Base
- —Accessing premium data endpoints with per-request micropayments
Fit
Best for
- —Agents or applications that support x402 payment protocol
- —Users who want keyless, pay-as-you-go API access
- —Developers building on Base network with USDC settlement
Not for
- —Users needing detailed API documentation or OpenAPI specs before integration
- —High-volume use cases where per-request pricing may add up
- —Anyone without a Base-compatible USDC wallet
Quick start
# The endpoint returns 402 until a valid X-PAYMENT header is provided.
# Use an x402-compatible client to handle payment automatically.
curl -X POST https://lowpaymentfee.com/api/v1/accounts/122/balance \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response documentation, and the docs pages are empty. The specific endpoint path (/accounts/122/balance) is not documented on the landing page, making its purpose and output format unclear.
Warnings
- —No OpenAPI or request/response schema available
- —Docs, pricing, and API pages render only 'Connect wallet' with no documentation content
- —The specific endpoint /api/v1/accounts/122/balance is not listed among the platform's documented APIs
- —Actual response format and required request body are unknown
Citations
- —The x402 challenge returns maxAmountRequired of 20000 in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/accounts/122/balance
- —The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Docs, pricing, API, and README pages show only 'Connect wallet' with no further contenthttps://lowpaymentfee.com/docs