x402-gated account balance endpoint on Base, pay-per-call with USDC.
What it does
This endpoint at lowpaymentfee.com exposes an account balance resource at `/api/v1/accounts/114/balance`, gated behind the x402 payment protocol. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum cost of $0.02 per request (20,000 base units at 6 decimals).
The broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments.
However, the specific endpoint being listed here (`/api/v1/accounts/114/balance`) is not described on the provider's landing page among the advertised APIs. Its purpose appears to be retrieving the balance of account 114, but no documentation, request schema, or response schema is available. The docs, pricing, and API pages all returned only a "Connect wallet" prompt with no additional content. Without further documentation it is unclear what data this endpoint returns or what input parameters it expects beyond the POST method.
Capabilities
Use cases
- —Querying account balance data via a single pay-per-call request
- —Integrating x402-compatible payment flows into agent workflows
- —Demonstrating x402 protocol usage on Base with USDC
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that need pay-per-call access without API key management
- —Low-volume, on-demand balance lookups
Not for
- —Production workloads requiring documented and stable API contracts
- —Users who need detailed API documentation or response schemas before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/114/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (returns 402 with a valid x402 challenge), but there is no documentation, no request/response schema, and the specific endpoint path is not listed among the provider's advertised APIs. Docs pages returned only 'Connect wallet' with no content. This is effectively a stub listing.
Warnings
- —The endpoint /api/v1/accounts/114/balance is not listed among the provider's advertised APIs on the landing page
- —No documentation, request schema, or response schema is available for this endpoint
- —All doc/pricing/API pages returned only a 'Connect wallet' prompt with no useful content
- —The purpose and output of this specific endpoint are unclear
Citations
- —The x402 challenge specifies USDC on Base with maxAmountRequired of 20000 (=$0.02)https://lowpaymentfee.com/api/v1/accounts/114/balance
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/accounts/114/balance