Top up prepaid credits with a single x402 USDC payment on Base. Choose a tier; the server demands the EXACT USDC amount registered for that tier (a payer cannot pay $10 and claim a $5,000 tier). On-chain tx hashes are unique-constrained so a replayed payment is rejected. Bonus credit is added on ...
Part of the TRIALPATH server.
Free to start. No card required.
AI agents invoke topup_credits to trigger processes or run actions in TRIALPATH. Execute operations can have side effects beyond the immediate call -- triggering builds, sending notifications, or starting workflows. Rate limits and argument validation are essential to prevent runaway execution.
topup_credits can trigger processes with real-world consequences. An uncontrolled agent might start dozens of builds, send mass notifications, or kick off expensive compute jobs. PolicyLayer enforces rate limits and validates arguments to keep execution within safe bounds.
Execute tools trigger processes. Rate-limit and validate arguments to prevent unintended side effects.
{
"version": "1",
"default": "deny",
"tools": {
"topup_credits": {
"limits": [
{
"counter": "topup_credits_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}See the full TRIALPATH policy for all 14 tools.
These attack patterns abuse exactly the kind of access topup_credits gives an agent. Each links to the full case and the policy that stops it:
Other execute tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Top up prepaid credits with a single x402 USDC payment on Base. Choose a tier; the server demands the EXACT USDC amount registered for that tier (a payer cannot pay $10 and claim a $5,000 tier). On-chain tx hashes are unique-constrained so a replayed payment is rejected. Bonus credit is added on top of the paid amount per the locked tier table: trial pays $10 and receives $10 of credit; builder pays $50 and receives $55 of credit (10% bonus); growth pays $200 and receives $250 of credit (most popular) (25% bonus); scale pays $1000 and receives $1300 of credit (30% bonus); enterprise pays $5000 and receives $6650 of credit (33% bonus).. It is categorised as a Execute tool in the TRIALPATH MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the TRIALPATH MCP server in PolicyLayer and add a rule for topup_credits: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches TRIALPATH. Nothing to install.
topup_credits is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the topup_credits rule in your PolicyLayer 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 PolicyLayer policy for topup_credits. 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.
topup_credits is provided by the TRIALPATH MCP server (spencerdgarrett/TRIALPATH). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 14 TRIALPATH tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.