Query RUNE wallet balances via x402 micropayment on Base for $0.02 per request.
What it does
This endpoint at lowpaymentfee.com returns RUNE wallet balance data, accessible through the x402 payment protocol. It accepts POST requests and charges $0.02 per call (20,000 base units of USDC on the Base network, where USDC uses 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof to receive a JSON response.
The endpoint is part of a broader suite of paid 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 endpoint `/api/v1/wallet/RUNE/balance` falls under the Finance & Web3 category, though it is not explicitly listed on the provider's landing page among the showcased endpoints. Payment settles on the Base L2 network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a 300-second payment timeout.
Documentation is extremely sparse. The provider's docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI schema, no request/response examples, and no description of what parameters the endpoint accepts or what fields the response contains. The endpoint is confirmed live (returns a proper x402 402 challenge), but the actual behavior and data source behind the RUNE balance lookup are unknown.
Capabilities
Use cases
- —Querying RUNE token wallet balances programmatically
- —Integrating RUNE balance checks into trading bots or portfolio trackers
- —Agent-driven crypto portfolio monitoring with per-call payment
Fit
Best for
- —Developers needing on-demand RUNE wallet balance data without API key management
- —AI agents that can settle x402 micropayments on Base
- —Low-volume or sporadic queries where per-request pricing is preferable to subscriptions
Not for
- —High-frequency balance polling where $0.02/request adds up quickly
- —Users who need detailed transaction history or multi-token wallet data beyond balance
- —Anyone without a Base-network USDC wallet to settle x402 payments
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wallet/RUNE/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>"Endpoint
Quality
The endpoint is confirmed live via a valid x402 402 challenge, but documentation is essentially nonexistent — no OpenAPI schema, no request/response examples, no parameter descriptions. The RUNE balance endpoint is not even listed on the provider's own landing page. Pricing and payment details are clear from the challenge, but functional behavior must be entirely inferred.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content
- —This specific endpoint (/api/v1/wallet/RUNE/balance) is not listed among the provider's advertised APIs on the landing page
- —No request or response schema is provided; input parameters and output format are unknown
- —Data source for RUNE balance lookups is unspecified
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/wallet/RUNE/balance
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/wallet/RUNE/balance