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/56/balance` is gated behind a per-request USDC payment on the Base network. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0.02 USD per request), consistent with the site-wide $0.02/request pricing advertised across all endpoints.
The provider lowpaymentfee.com hosts a broader suite of x402-gated APIs spanning data & analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, require no API keys, and claim no rate limits.
However, the specific functionality of this particular endpoint (`/accounts/56/balance`) is unclear — it appears to be an account balance query, but no documentation describes the request format, expected input parameters, or response schema. The docs, pricing, API, and README pages all returned only a "Connect wallet" prompt with no substantive content. Without schema details or example responses, the actual utility of this endpoint is difficult to assess.
Capabilities
Use cases
- —Querying account balance information via a single paid API call
- —Integrating x402 payment-gated balance lookups into agent workflows
- —Demonstrating x402 protocol usage for micropayment-based API access
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents needing pay-per-call balance data without API key management
- —Low-volume queries where $0.02/request is acceptable
Not for
- —High-volume balance monitoring requiring bulk or subscription pricing
- —Users who need detailed documentation or guaranteed SLAs before integrating
Quick start
# 1. Send a POST to the endpoint — you'll get a 402 with payment challenge
curl -X POST https://lowpaymentfee.com/api/v1/accounts/56/balance
# 2. Parse the 402 response, construct an x402 payment header (USDC on Base),
# and resend with X-PAYMENT header attached.Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, no examples, and the docs pages are empty. The purpose of this specific endpoint (account 56 balance) is ambiguous and unexplained.
Warnings
- —No API documentation available — docs, pricing, API, and README pages all return only a 'Connect wallet' prompt with no content.
- —No request or response schema provided; input format and output structure are unknown.
- —The endpoint path references a specific account ID (56), and it is unclear whether this is parameterizable or a fixed demo resource.
- —The broader site lists many endpoint categories (AI, finance, utils) but none have visible documentation — actual functionality behind these endpoints is unverified.
Citations
- —The x402 challenge requires a maximum of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/accounts/56/balance
- —Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The provider offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com