Query perpetual wallet balances via x402 micropayment on Base for $0.02/request.
What it does
This endpoint at lowpaymentfee.com provides a perpetual (PERP) wallet balance lookup accessible via the x402 payment protocol. It is part of a broader suite of pay-per-call APIs hosted on the same domain, spanning data analytics, AI/ML inference, finance/Web3, and utility services. All endpoints on the platform share a uniform $0.02 per request pricing model settled in USDC on the Base network.
The specific endpoint `/api/v1/wallet/PERP/balance` accepts POST requests and returns JSON. Based on the URL structure, it appears designed to return the balance of a perpetual-protocol wallet, likely in the context of decentralized derivatives or perpetual futures trading. The x402 challenge confirms the endpoint is live, requiring an exact payment of 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 given USDC's 6 decimals.
No API keys or rate limits are advertised. Payment is handled entirely through the x402 protocol's X-PAYMENT header. Documentation on the site is extremely thin — the docs, API, pricing, and README pages all resolve to a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material.
Capabilities
Use cases
- —Querying perpetual-protocol wallet balances programmatically
- —Integrating real-time PERP balance data into trading bots or dashboards
- —Agent-driven portfolio monitoring for decentralized perpetual positions
Fit
Best for
- —Developers needing on-demand perpetual wallet balance lookups without API key management
- —AI agents that can settle x402 micropayments on Base
- —Low-volume or sporadic queries where pay-per-call is more economical than a subscription
Not for
- —High-frequency trading requiring sub-second latency and bulk queries (no documented batch support)
- —Users who cannot settle USDC payments on the Base network
- —Anyone needing detailed documentation or guaranteed SLAs
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wallet/PERP/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Example
Request
{}Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming pricing and network. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The actual functionality of the endpoint can only be inferred from the URL path. This is effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available — request body and response format are unknown
- —All documentation pages (docs, API, pricing, README) resolve to a bare 'Connect wallet' prompt with no technical content
- —Endpoint functionality inferred solely from URL path; actual behavior unverified
- —No response example available from crawl or probe
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/wallet/PERP/balance
- —All APIs on the platform 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 address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/wallet/PERP/balance