x402-gated account balance endpoint on Base, pay-per-call with USDC.
What it does
This endpoint at lowpaymentfee.com provides a pay-per-request "Premium API Access" resource at the path `/api/v1/accounts/32/balance`. It is part of a broader platform offering dozens of x402-gated API endpoints spanning 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 probed (`/api/v1/accounts/32/balance`) returns a live 402 challenge with a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this equals $0.02 per call, consistent with the platform's advertised flat pricing. Payment is made via the x402 protocol (version 1, "exact" scheme) with no API keys or rate limits required — callers simply attach an X-PAYMENT header to each request.
Documentation on the site is extremely thin: the docs, pricing, API, 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 usage examples. The endpoint name ("accounts/32/balance") suggests it returns a balance for a specific account ID, but the exact request body format and response structure are unknown. The platform advertises categories including sentiment analysis, text summarization, embeddings, price feeds, gas estimates, geocoding, and more, but none of these are documented beyond their listing on the homepage.
Capabilities
Use cases
- —Querying account balance data via a single paid API call
- —Integrating pay-per-request balance lookups into agent workflows
- —Accessing financial data without managing API keys or subscriptions
Fit
Best for
- —Agents needing simple pay-per-call access without authentication setup
- —Developers experimenting with x402 payment protocol integrations
- —Low-volume, on-demand account balance queries
Not for
- —High-volume production workloads requiring documented SLAs and schemas
- —Use cases requiring detailed API documentation or response guarantees
- —Users who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/32/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a homepage listing, and the specific purpose of this endpoint (accounts/32/balance) is unclear. Effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'
- —No OpenAPI or output schema provided; request body format and response structure are unknown
- —The endpoint path '/api/v1/accounts/32/balance' has a hardcoded account ID (32) with no explanation of what it represents
- —Platform lists many endpoint categories (AI, analytics, finance, etc.) but none are documented beyond titles
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/accounts/32/balance
- —Platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/accounts/32/balance
- —Docs, pricing, API, and README pages render only 'Connect wallet' with no further contenthttps://lowpaymentfee.com/docs