Let an AI agent pay in USDC on NEAR only inside owner-signed mandates, with a signed ledger.
Connect Runs on your machine
claude mcp add probarion -e PROBARION_VAULT_ID=<PROBARION_VAULT_ID> -e NEAR_NETWORK=<NEAR_NETWORK> -e PROBARION_KEYS_FILE=<PROBARION_KEYS_FILE> -e PROBARION_AGENT_KEY=<PROBARION_AGENT_KEY> -e PROBARION_LEDGER_KEY=<PROBARION_LEDGER_KEY> -e NEAR_RPC_URLS=<NEAR_RPC_URLS> -e NEAR_ARCHIVAL_RPC_URLS=<NEAR_ARCHIVAL_RPC_URLS> -e PROBARION_LEDGER_PATH=<PROBARION_LEDGER_PATH> -- npx -y @probarion/[email protected]{
"mcpServers": {
"probarion": {
"command": "npx",
"args": [
"-y",
"@probarion/[email protected]"
],
"env": {
"PROBARION_VAULT_ID": "<PROBARION_VAULT_ID>",
"NEAR_NETWORK": "<NEAR_NETWORK>",
"PROBARION_KEYS_FILE": "<PROBARION_KEYS_FILE>",
"PROBARION_AGENT_KEY": "<PROBARION_AGENT_KEY>",
"PROBARION_LEDGER_KEY": "<PROBARION_LEDGER_KEY>",
"NEAR_RPC_URLS": "<NEAR_RPC_URLS>",
"NEAR_ARCHIVAL_RPC_URLS": "<NEAR_ARCHIVAL_RPC_URLS>",
"PROBARION_LEDGER_PATH": "<PROBARION_LEDGER_PATH>"
}
}
}
}{
"mcpServers": {
"probarion": {
"command": "npx",
"args": [
"-y",
"@probarion/[email protected]"
],
"env": {
"PROBARION_VAULT_ID": "<PROBARION_VAULT_ID>",
"NEAR_NETWORK": "<NEAR_NETWORK>",
"PROBARION_KEYS_FILE": "<PROBARION_KEYS_FILE>",
"PROBARION_AGENT_KEY": "<PROBARION_AGENT_KEY>",
"PROBARION_LEDGER_KEY": "<PROBARION_LEDGER_KEY>",
"NEAR_RPC_URLS": "<NEAR_RPC_URLS>",
"NEAR_ARCHIVAL_RPC_URLS": "<NEAR_ARCHIVAL_RPC_URLS>",
"PROBARION_LEDGER_PATH": "<PROBARION_LEDGER_PATH>"
}
}
}
}{
"servers": {
"probarion": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@probarion/[email protected]"
],
"env": {
"PROBARION_VAULT_ID": "<PROBARION_VAULT_ID>",
"NEAR_NETWORK": "<NEAR_NETWORK>",
"PROBARION_KEYS_FILE": "<PROBARION_KEYS_FILE>",
"PROBARION_AGENT_KEY": "<PROBARION_AGENT_KEY>",
"PROBARION_LEDGER_KEY": "<PROBARION_LEDGER_KEY>",
"NEAR_RPC_URLS": "<NEAR_RPC_URLS>",
"NEAR_ARCHIVAL_RPC_URLS": "<NEAR_ARCHIVAL_RPC_URLS>",
"PROBARION_LEDGER_PATH": "<PROBARION_LEDGER_PATH>"
}
}
}
}Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools
This server runs locally, so its tools are listed by your MCP client once it starts.
Environment variables
| Name | Description |
|---|---|
PROBARION_VAULT_IDRequired | The vault account, for example acme.vaults.probarion.testnet. A name ending in .near is on mainnet, one ending in .testnet on testnet |
NEAR_NETWORKOptional | mainnet or testnet. Needed only when the vault id ends in neither .near nor .testnet; when set, the vault id's ending must agree with it |
PROBARION_KEYS_FILEOptional | Absolute path of the keys file that probarion-mcp init wrote, which must exist. Default ~/.probarion/<vault>/keys.json, used when it exists. With no keys the server is read-only |
PROBARION_AGENT_KEYOptional, secret | The agent key's secret (ed25519:...), the vault's key that can only call spend, in place of a keys file. Set it with PROBARION_LEDGER_KEY, or neither |
PROBARION_LEDGER_KEYOptional, secret | The ledger key's secret (ed25519:...), the vault's key that can only call anchor, in place of a keys file. Set it with PROBARION_AGENT_KEY, or neither |
NEAR_RPC_URLSOptional | Comma-separated https:// NEAR RPC URLs in failover order, with no user name or password (http:// only for a node on this machine). Default: the public RPCs @probarion/core lists for the network |
NEAR_ARCHIVAL_RPC_URLSOptional | Comma-separated archival RPC URLs that verify reads old transactions from, with the same rules as NEAR_RPC_URLS. Default: FastNEAR's archival node |
PROBARION_LEDGER_PATHOptional | Absolute path of the ledger file: a relative one is taken from the folder the client starts the server in. Default ~/.probarion/<vault>/ledger.jsonl |
Details
| Package | @probarion/[email protected] (NPM, stdio) |
| First published | 11 Nov 2026 |
| Last updated | 11 Nov 2026 |
| Registry name | io.github.probarion/probarion |
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