Syncs external payments sent to BRC-29 deposit addresses into the wallet. Triggers lazy indexing on the server, classifies outputs (funding, ordinals, tokens), and internalizes them.
AI agents use wallet_refreshUtxos to create or update resources in Bitcoin SV MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Bitcoin SV MCP Server environment.
This tool modifies wallet state by syncing and internalizing UTXOs — it writes/updates data in the wallet. While it involves blockchain/financial context, it does not move money or commit financial obligations; it only imports/classifies existing received funds into the wallet's internal state. No irreversible deletion occurs. Write is the most appropriate category.
From the tool's definition Syncs external payments... Triggers lazy indexing on the server, classifies outputs... and internalizes them
Documented attack patterns abuse exactly the kind of access wallet_refreshUtxos gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Bitcoin SV MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for wallet_refreshUtxos:
{
"version": "1",
"default": "deny",
"tools": {
"wallet_refreshUtxos": {
"limits": [
{
"counter": "wallet_refreshutxos_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}wallet_refreshUtxos stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Syncs external payments sent to BRC-29 deposit addresses into the wallet. Triggers lazy indexing on the server, classifies outputs (funding, ordinals, tokens), and internalizes them. It is categorised as a Write tool in the Bitcoin SV MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Bitcoin SV MCP Server MCP server in PolicyLayer and add a rule for wallet_refreshUtxos: 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 Bitcoin SV MCP Server. Nothing to install.
wallet_refreshUtxos 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 wallet_refreshUtxos 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 wallet_refreshUtxos. 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.
wallet_refreshUtxos is provided by the Bitcoin SV MCP Server MCP server (b-open-io/bsv-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Bitcoin SV MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
80 Bitcoin SV MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.