Monte Carlo impermanent loss simulation (200 scenarios) for DeFi liquidity positions, paid per call via x402/USDC on Base.
What it does
The `/api/defi/il-simulate` endpoint is part of DeFi Shield, a suite of 69 paid API endpoints providing security intelligence to autonomous AI agents. This specific endpoint runs Monte Carlo impermanent loss simulations across 200 scenarios, helping agents and developers estimate potential IL exposure for liquidity pool positions before committing capital.
The endpoint accepts POST requests and is gated by the x402 payment protocol, settling in USDC on Base at $1.00 per call. Like all DeFi Shield endpoints, it supports free GET-based discovery (returning endpoint metadata and an `llm_usage_prompt`) and paid POST requests that require an x402 payment header. Payment settles only on successful response.
DeFi Shield is hosted on Vercel and provides additional discovery mechanisms including a health endpoint (`/api/health`) listing all endpoints and pricing, an analytics endpoint (`/api/analytics`), and an A2A agent card at `/.well-known/agent-card.json`. No OpenAPI schema or detailed parameter documentation was found during crawling — the `/docs` page returns 404 — so exact request/response schemas must be inferred from the endpoint's discovery GET or from the general patterns described on the landing page.
Capabilities
Use cases
- —Estimate impermanent loss before providing liquidity to an AMM pool
- —Compare IL risk across multiple pool pairs to choose the safest position
- —Integrate IL simulation into an autonomous DeFi agent's decision pipeline
- —Backtest LP strategies under various volatility scenarios
- —Alert systems that flag high-IL-risk positions before entry
Fit
Best for
- —AI agents autonomously managing DeFi liquidity positions
- —Developers building LP risk dashboards
- —Automated portfolio rebalancing systems that need IL estimates
Not for
- —Users needing free or high-volume IL calculations (each call costs $1.00)
- —Non-DeFi or traditional finance risk modeling without blockchain context
- —Detailed historical IL accounting on existing positions (this is forward-looking simulation)
Quick start
# Free discovery (returns endpoint metadata)
curl https://defi-shield-hazel.vercel.app/api/defi/il-simulate
# Paid request (requires x402 payment header)
curl -X POST https://defi-shield-hazel.vercel.app/api/defi/il-simulate \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{"pool": "0x..."}'Endpoint
Quality
The endpoint is confirmed live (402 on POST), and the landing page provides clear pricing and a high-level description. However, no OpenAPI schema, detailed parameter docs, or example request/response bodies are available — the /docs page 404s and the x402 challenge body was empty. Exact input fields and response structure must be discovered via the endpoint's GET method.
Warnings
- —No OpenAPI or JSON schema available for request/response bodies
- —The /docs page returns 404 — no detailed documentation found
- —The x402 challenge object was empty, so payment parameters (asset, amount, network) could not be independently verified from the probe
- —Request and response examples are not available and had to be omitted
Citations
- —The endpoint runs Monte Carlo impermanent loss simulation across 200 scenarios and costs $1.00 per callhttps://defi-shield-hazel.vercel.app
- —DeFi Shield has 69 paid API endpoints settling in USDC via x402 on Base, priced $0.01–$2.50 per callhttps://defi-shield-hazel.vercel.app
- —Every endpoint supports free GET-based discovery with llm_usage_prompthttps://defi-shield-hazel.vercel.app
- —Payment settles only on successful responsehttps://defi-shield-hazel.vercel.app
- —Discovery available at /.well-known/agent-card.json and /api/healthhttps://defi-shield-hazel.vercel.app