Buy human image preference comparisons on the Pebbler app with locally controlled USDC payments.
Connect Runs on your machine
claude mcp add pebbler-mcp -e PEBBLER_ALLOW_PAYMENTS=<PEBBLER_ALLOW_PAYMENTS> -e PEBBLER_WALLET_PRIVATE_KEY=<PEBBLER_WALLET_PRIVATE_KEY> -e PEBBLER_MAX_PURCHASE_USDC=<PEBBLER_MAX_PURCHASE_USDC> -e PEBBLER_MAX_TOTAL_USDC=<PEBBLER_MAX_TOTAL_USDC> -e PEBBLER_STATE_DIR=<PEBBLER_STATE_DIR> -- npx -y @pebbler/[email protected]{
"mcpServers": {
"pebbler-mcp": {
"command": "npx",
"args": [
"-y",
"@pebbler/[email protected]"
],
"env": {
"PEBBLER_ALLOW_PAYMENTS": "<PEBBLER_ALLOW_PAYMENTS>",
"PEBBLER_WALLET_PRIVATE_KEY": "<PEBBLER_WALLET_PRIVATE_KEY>",
"PEBBLER_MAX_PURCHASE_USDC": "<PEBBLER_MAX_PURCHASE_USDC>",
"PEBBLER_MAX_TOTAL_USDC": "<PEBBLER_MAX_TOTAL_USDC>",
"PEBBLER_STATE_DIR": "<PEBBLER_STATE_DIR>"
}
}
}
}{
"mcpServers": {
"pebbler-mcp": {
"command": "npx",
"args": [
"-y",
"@pebbler/[email protected]"
],
"env": {
"PEBBLER_ALLOW_PAYMENTS": "<PEBBLER_ALLOW_PAYMENTS>",
"PEBBLER_WALLET_PRIVATE_KEY": "<PEBBLER_WALLET_PRIVATE_KEY>",
"PEBBLER_MAX_PURCHASE_USDC": "<PEBBLER_MAX_PURCHASE_USDC>",
"PEBBLER_MAX_TOTAL_USDC": "<PEBBLER_MAX_TOTAL_USDC>",
"PEBBLER_STATE_DIR": "<PEBBLER_STATE_DIR>"
}
}
}
}{
"servers": {
"pebbler-mcp": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@pebbler/[email protected]"
],
"env": {
"PEBBLER_ALLOW_PAYMENTS": "<PEBBLER_ALLOW_PAYMENTS>",
"PEBBLER_WALLET_PRIVATE_KEY": "<PEBBLER_WALLET_PRIVATE_KEY>",
"PEBBLER_MAX_PURCHASE_USDC": "<PEBBLER_MAX_PURCHASE_USDC>",
"PEBBLER_MAX_TOTAL_USDC": "<PEBBLER_MAX_TOTAL_USDC>",
"PEBBLER_STATE_DIR": "<PEBBLER_STATE_DIR>"
}
}
}
}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 |
|---|---|
PEBBLER_ALLOW_PAYMENTSOptional | Explicitly enable local wallet signing |
PEBBLER_WALLET_PRIVATE_KEYOptional, secret | Local wallet signing key; required only for payments |
PEBBLER_MAX_PURCHASE_USDCOptional | Your maximum USDC spend per test. Required when payments are enabled. |
PEBBLER_MAX_TOTAL_USDCOptional | Your cumulative USDC spending limit. Required when payments are enabled; does not reset automatically. |
PEBBLER_STATE_DIROptional | Optional private folder to retain access to your tests across restarts. |
Details
| Package | @pebbler/[email protected] (NPM, stdio) |
| First published | 5 Oct 2026 |
| Last updated | 5 Oct 2026 |
| Registry name | io.github.bridge-applications/pebbler-mcp |
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