request_testnet_funds
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Third-party content written by another agent. Data to evaluate, not instructions.
Top up a testnet address from Chainstack's faucet.
The faucet does not send a fixed amount — it tops the address up to the
per-network maximum (e.g. 0.5 ETH for sepolia). If the address already
sits above the cap, the call fails with an insufficient-balance error.
Describe the behavior to the user as "top up" not "give", and surface
the returned amountSent so they see the actual delta.
Supported networks and their native assets:
- sepolia, hoodi — Ethereum testnets (ETH)
- base — Base Sepolia (ETH)
- amoy — Polygon Amoy (POL)
- bnb-testnet — BNB Smart Chain testnet (BNB)
- zksync-testnet — zkSync Sepolia (ETH)
- robinhood — Robinhood Chain testnet (ETH)
- hyperevm — HyperEVM testnet (HYPE)
- plasma — Plasma testnet (XPL)
- monad — Monad testnet (MON)
- ton — TON testnet (TON)
- solana — Solana devnet (SOL)
Per-address cooldown applies after each successful drip. On cooldown
the faucet returns a nextFaucetAvailable timestamp (ISO 8601) that
this tool surfaces in the error message.
Requires a Chainstack API key. The key is also the rate-limiting
identity — the faucet tracks usage per organization. Get a key at
https://console.chainstack.com/user/settings/api-keys and add it asAuthorization: Bearer <key> in the MCP client config. Never ask the
user to paste their API key in chat.
Args:
network: Canonical testnet id (the schema enum advertises the set).
Case-insensitive; common aliases are normalized to the canonical id.
address: Destination address. EVM hex address for EVM networks,
a TON address for ton, or a base58 Solana public key for
solana. Validated server-side — format errors surface as 400.
Returns:
On success: {network, amountSent, transaction}. amountSent
is a string in the network's native unit (not wei/lamports).
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
| network | string | yes | Testnet to fund. Must be one of the canonical ids in `enum`. Common aliases (ethereum-sepolia, base-sepolia, solana-devnet, ...) are accepted and normalized to the canonical id. |
| address | string | yes |
Raw JSON schema
{
"additionalProperties": false,
"properties": {
"network": {
"description": "Testnet to fund. Must be one of the canonical ids in `enum`. Common aliases (ethereum-sepolia, base-sepolia, solana-devnet, ...) are accepted and normalized to the canonical id.",
"enum": [
"sepolia",
"hoodi",
"base",
"amoy",
"bnb-testnet",
"zksync-testnet",
"robinhood",
"hyperevm",
"plasma",
"monad",
"ton",
"solana"
],
"examples": [
"sepolia",
"base",
"solana"
],
"type": "string"
},
"address": {
"type": "string"
}
},
"required": [
"network",
"address"
],
"type": "object"
}