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/134/balance` is gated behind a per-request USDC payment on the Base network. The x402 challenge confirms the endpoint is live and accepts POST requests, returning JSON responses.
The parent site lowpaymentfee.com hosts a broader suite of pay-per-call APIs spanning data & analytics, AI/ML inference (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 advertised at $0.02 per request with no API keys, no rate limits, and no commitments required. Payment settles in USDC on the Base L2 network.
The specific endpoint being listed here (`/accounts/134/balance`) charges a maximum of 20,000 base units of USDC (6 decimals), which equals $0.02 per call — consistent with the site-wide pricing. The x402 challenge specifies the "exact" payment scheme, a 300-second timeout, and pays to address `0x1A2B...85F3`. No OpenAPI schema, detailed documentation, or example responses were found in the crawl; the docs, pricing, and API pages all rendered only a "Connect wallet" prompt with no further content.
Capabilities
Use cases
- —Querying account balance data with per-call USDC micropayments
- —Integrating pay-as-you-go balance lookups into agent workflows
- —Accessing financial account data without API key registration
Fit
Best for
- —Agents or services that need on-demand account balance checks without subscription commitments
- —Developers experimenting with x402 payment-gated APIs on Base
- —Workflows requiring keyless, permissionless API access settled in USDC
Not for
- —High-volume balance polling where per-call costs would accumulate quickly
- —Users who need detailed API documentation or guaranteed SLAs before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/134/balance
# Returns 402 with x402 payment challenge.
# Attach X-PAYMENT header with a signed USDC payment on Base to receive the response.Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/call in USDC on Base). However, there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, no example request/response bodies, and the specific purpose of the /accounts/134/balance resource is unclear — it could be a demo or placeholder. Very limited information to work with.
Warnings
- —No API documentation available — docs, pricing, and API pages all render only 'Connect wallet' with no content.
- —No OpenAPI or output schema provided; the response format is unknown.
- —The endpoint path includes a hardcoded account ID (134), suggesting this may be a demo or single-purpose resource rather than a general-purpose API.
- —No example responses or error handling documentation found.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/accounts/134/balance
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The site offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/accounts/134/balance