Check Monero (XMR) wallet balances via a pay-per-call x402 endpoint on Base.
What it does
This endpoint at lowpaymentfee.com returns Monero (XMR) wallet balance data, accessible through the x402 payment protocol. Each call costs $0.02 in USDC on the Base network — no API keys, no rate limits, and no subscriptions required. The caller simply includes an X-PAYMENT header with a valid x402 payment proof and receives a JSON response.
The endpoint is part of a broader suite of APIs offered by lowpaymentfee.com spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced uniformly at $0.02 per request. The specific path `/api/v1/wallet/XMR/balance` suggests it queries or returns balance information for a Monero wallet, though the exact request and response schemas are not documented. The x402 challenge confirms the endpoint is live, accepts POST requests, settles in USDC (contract 0x8335…2913) on Base, and has a maximum timeout of 300 seconds.
Documentation on the site is extremely sparse — the docs, pricing, and API pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no example requests or responses, and no description of what parameters the endpoint accepts or what fields the response contains. Users should expect to experiment or contact the provider for integration guidance.
Capabilities
Use cases
- —Querying Monero wallet balances programmatically without API key management
- —Integrating XMR balance lookups into agent workflows that support x402 payments
- —Building dashboards or alerts that monitor Monero wallet balances
Fit
Best for
- —Developers needing on-demand Monero balance data without subscriptions
- —AI agents with x402 payment capability that need crypto balance info
- —Low-volume or sporadic XMR balance queries where pay-per-call is cost-effective
Not for
- —High-frequency trading systems needing sub-second latency and bulk queries
- —Users who need detailed Monero transaction history or full-node RPC access
- —Anyone without a Base-network USDC wallet for x402 payments
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wallet/XMR/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The docs pages are empty stubs. The actual functionality of the XMR balance endpoint is inferred entirely from the URL path.
Warnings
- —No OpenAPI spec or schema available — request parameters and response format are unknown
- —All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no technical content
- —The exact functionality (e.g., whether you supply a wallet address or it checks a fixed wallet) is undocumented
- —This endpoint is part of a site listing many diverse APIs at uniform $0.02 pricing; quality and reliability of individual endpoints is unverified
Citations
- —The endpoint returns HTTP 402 with an x402 challenge advertising USDC on Base at maxAmountRequired 20000 (= $0.02)https://lowpaymentfee.com/api/v1/wallet/XMR/balance
- —All APIs on the site are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/wallet/XMR/balance