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DropEngine Preflight Action
x402
DropEngine Preflight Action is a paid API for AI agents from mcp.dropenginehq.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-16).
Pre-screens and validates a wide range of agent intents — tool calls, installs, transactions, claims, and content — before execution, returning a risk assessment and go/no-go signal.
Price / call$0.02
Success—
StatusUnknown
How this service works
Discover pay-per-call MCP services for agent security, web research, product data, invoice checks, blockchain risk and crypto analysis. Base USDC via x402.
Output
Returns a structured preflight verdict including a risk assessment, a go/no-go recommendation, and any flags or discrepancies found — such as wallet risk indicators, claim mismatches, unsafe URL patterns, or package vulnerabilities — scoped to the specific action type and target provided.
Example use cases
Transaction safety gate before payment
“Before you execute that USDC transfer on Base from my wallet 0xABC...111 to 0xDEF...222, run a preflight check with low risk tolerance — the intent is to pay a contractor, and I want to make sure the destination isn't flagged.”
MCP tool call validation for agent pipeline
“Before my agent calls the tool 'fetch_customer_data' on the MCP endpoint at https://mcp.example.com, do a preflight validation with medium risk tolerance to confirm the call is safe and appropriate for the intent of retrieving order history.”
npm package install risk screen
“My agent is about to install the npm package 'payment-helper-utils' — can you preflight it with low risk tolerance to check for malware, typosquatting, or install-script risks before we proceed?”
Technical details
Endpoint
POSThttps://mcp.dropenginehq.com/api/preflight-action?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an autonomous agent needs a unified pre-execution safety gate before performing any consequential action — including blockchain transactions, MCP tool calls, URL fetches, npm installs, content verification, or invoice checks. It is the single-endpoint alternative to calling multiple specialized preflight services individually, and is especially valuable when the agent must enforce a configurable risk tolerance before acting.
Side effects
- Intent string too short or missing (minLength:3 violation)
- Target URL malformed or exceeds 4096 characters
- Wallet address does not match 0x hex pattern
- Token object missing required chain or token_address fields
- Transaction object missing required fields (chain, from, to, value, data)
- Unsupported action_type enum value
- Content exceeds 100,000 character limit
- Service unavailable or payment not processed (x402 payment required)
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| intent | string | |
| target | object | |
| context | object | |
| action_type | string | |
| expected_cost | object |
Tags
x402
Reviews
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Zero review prompt (fires after every successful call)
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