BEST FOR: fire-and-forget event notifications (server-to-server push). PREFER transactionSubscribe for live client-side streaming. PREFER laserstreamSubscribe for lowest-latency production streaming. Create a webhook to monitor Solana events in real-time with powerful filtering. Use this to track...
Part of the Helius MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.
AI agents use createWebhook to create or modify resources in Helius. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call createWebhook repeatedly, creating or modifying resources faster than any human could review. Intercept's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Helius.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
tools:
createWebhook:
rules:
- action: allow
rate_limit:
max: 30
window: 60See the full Helius policy for all 63 tools.
Agents calling write-class tools like createWebhook have been implicated in these attack patterns. Read the full case and prevention policy for each:
Other tools in the Write risk category across the catalogue. The same policy patterns (rate-limit, validate) apply to each.
BEST FOR: fire-and-forget event notifications (server-to-server push). PREFER transactionSubscribe for live client-side streaming. PREFER laserstreamSubscribe for lowest-latency production streaming. Create a webhook to monitor Solana events in real-time with powerful filtering. Use this to track NFT sales, token swaps, staking, and 150+ transaction types. Webhooks send HTTP POST with parsed transaction data to your URL. Enhanced webhooks include human-readable descriptions. Credit cost: 100 credits to create (management operation). Each event delivered subsequently costs 1 credit.. It is categorised as a Write tool in the Helius MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Add a rule in your Intercept YAML policy under the tools section for createWebhook. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Helius MCP server.
createWebhook is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the createWebhook rule in your Intercept policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the Intercept policy for createWebhook. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
createWebhook is provided by the Helius MCP server (helius-mcp). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic policy on every MCP tool call. Per-identity grants. Full audit log.