magpie-mcp

MCP server exposing the Magpie Capital x402 API as native tools for Claude Desktop, Cursor, Windsurf, ChatGPT desktop, and any other MCP-aware agent host.

Drop one config block into your host and your agent can query Magpie's protocol state, simulate borrows, fetch credit scores, build deposit/withdraw transactions, post conditional borrow intents, and arm self-owned in-vault take-profit / stop-loss exits on its own loans — all as first-class tool calls. No bespoke client code, no API keys.

A share of Magpie protocol fees accrues to a $MAGPIE holder-rewards pool, paid pro-rata in SOL (no staking, no lockup). 70% is the governance-ratified (MGP-001) target allocation; distributions run on a governance cadence. x402 call fees feed the same holder-rewards economics — agent adoption grows the fees that reward holders.

What it exposes

26 tools wrapping the x402 endpoints:

Free reads (work out of the box):

• magpie_pool_state — live LendingPool account
• magpie_protocol_pulse — 24h aggregates (active loans, volume, liquidations)
• magpie_recent_activity — anonymized borrow/repay/liquidate stream
• magpie_loan — single loan by ID
• magpie_wallet_loans — all loans for a wallet
• magpie_tiers — protocol tier constants
• magpie_simulate_borrow — quote a loan without submitting
• magpie_collateral_eligible — full collateral catalog
• magpie_liquidatable — loans currently liquidatable
• magpie_credit_leaderboard — top wallets by credit score
• magpie_lp_state — depositor position + pool context
• magpie_loan_by_pda — single loan by on-chain loan PDA
• magpie_pools — Magpie lending pools (program-version lanes + context)
• magpie_list_exits — armed in-vault exit orders for a wallet
• magpie_modify_exit — change an armed exit's trigger / params
• magpie_cancel_exit — cancel an armed exit (loan stays Active)

Paid (require a configured Solana keypair):

• magpie_credit_score — 0.001 SOL
• magpie_token_risk — 0.001 SOL (per-token risk profile)
• magpie_build_borrow — 0.005 SOL (pass has_exit_arming: true to route into the V4 in-vault-exit lane)
• magpie_build_repay — 0.002 SOL
• magpie_build_deposit — 0.002 SOL
• magpie_build_withdraw — 0.002 SOL
• magpie_build_liquidate — 0.003 SOL (liquidate a past-due loan, receive keeper bounty)
• magpie_create_intent — 0.01 SOL (conditional borrow)
• magpie_get_intent — 0.0005 SOL (poll)
• magpie_arm_exit — 0.001 SOL (arm a self-owned in-vault TP / SL / trailing exit)

When a paid tool fires, the server signs an x402 payment tx locally with your configured keypair and forwards the signature to magpie-x402. The keypair never leaves your machine.

Self-owned in-vault exits (V4)

Magpie's V4 lane lets an agent arm its own take-profit, stop-loss, and trailing exits on its own active loan — and the sell happens in-vault: when a trigger fires, the collateral is auto-sold and the proceeds (SOL by default, or USDC) accumulate inside that loan's per-loan proceeds vault while the loan stays Active. Proceeds only ever reach your wallet through your own borrower-signed repay. There's no fire-and-close, and nothing the protocol can do to move your funds out.

• magpie_arm_exit (0.001 SOL) — arm a TP / SL / trailing exit on a V4 loan you own. Set direction (above = take-profit, the default; below = stop-loss) and exactly one trigger: target (e.g. "2x" / "0.7x"), price_usd, mc_usd (e.g. "5M", "1.2B"), or trailing_bps (stop-loss only). Optional slippage_bps, dest (sol | usdc), and slice for laddered exits.
• magpie_modify_exit (free) — retune an armed order's trigger or params in place.
• magpie_cancel_exit (free) — remove an armed order; the loan is untouched.
• magpie_list_exits (free) — audit a wallet's armed orders, each with its distance-to-trigger.

Every exit call is authenticated with a dependency-free Ed25519 signed envelope built locally from your configured keypair. For magpie_arm_exit the envelope is signed by the same keypair that pays the 0.001 SOL x402 challenge, so the bot's payer == signer invariant holds and only the owner of a loan can arm exits on it. The bot enforces a 5-minute freshness window and nonce-uniqueness on every envelope.

To start a borrow that supports these exits, call magpie_build_borrow with has_exit_arming: true (routes into V4); leave it false for a plain memecoin (V1) borrow.

RWA / xStock collateral runs on the separate V3 lane, which is launch-gated — on the V3 launch, the same exit tooling will extend to RWA loans.

Install

Two paths. Both end at the same place.

Path A — npm (recommended once published)

No clone, no build, no absolute paths in your host config:

# Verify it runs once before wiring into your host:
npx -y @magpieloans/magpie-mcp --help

Then in your host config:

{
  "mcpServers": {
    "magpie": {
      "command": "npx",
      "args": ["-y", "@magpieloans/magpie-mcp"],
      "env": {
        "SOLANA_RPC_URL": "https://api.mainnet-beta.solana.com",
        "MAGPIE_MCP_PAYER_KEYPAIR": "/path/to/payer-id.json"
      }
    }
  }
}

Path B — from source

If the npm package isn't published yet, or you want to hack on the server:

git clone [email protected]:magpiecapital/magpie-x402.git
cd magpie-x402/mcp
npm install
npm run build

Built executable lands at mcp/dist/index.js. Use the absolute path in your host config below.

Configure your host

Pick the snippet for your host. The command + args shape changes between npm-install vs source-build; the env block is identical.

Claude Desktop

Edit ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows):

{
  "mcpServers": {
    "magpie": {
      "command": "node",
      "args": ["/ABS/PATH/TO/magpie-x402/mcp/dist/index.js"],
      "env": {
        "SOLANA_RPC_URL": "https://api.mainnet-beta.solana.com",
        "MAGPIE_MCP_PAYER_KEYPAIR": "/ABS/PATH/TO/payer-id.json"
      }
    }
  }
}

Restart Claude Desktop. The Magpie tools appear in the tool picker.

Cursor

Edit ~/.cursor/mcp.json. Same shape as Claude Desktop above.

Windsurf

Edit ~/.codeium/windsurf/mcp_config.json. Same shape.

ChatGPT desktop / any other MCP-aware host

Use the same shape — point the host at node /ABS/PATH/.../mcp/dist/index.js, pass env vars through the host's MCP config interface.

Free-only mode (no keypair)

Omit MAGPIE_MCP_PAYER_KEYPAIR and the read-only free tools still work. Paid tools — and the envelope-signed exit tools (magpie_arm_exit, magpie_modify_exit, magpie_cancel_exit, which need the keypair to sign the envelope even though modify/cancel cost nothing) — return a clear error explaining that no payer is configured. Useful for read-only research agents or as a no-friction first install.

Environment variables

| Variable | Default | Purpose | |---|---|---| | MAGPIE_X402_BASE_URL | https://x402.magpie.capital | Override for self-hosted or testnet deployments | | SOLANA_RPC_URL | https://api.mainnet-beta.solana.com | RPC used to send x402 payment txs. Public RPC rate-limits aggressively — use Helius/Triton/QuickNode for any real volume. | | MAGPIE_MCP_PAYER_KEYPAIR | (unset) | Path to a Solana keypair JSON in the standard solana-keygen format. Enables paid tools. |

Cost ceiling

The keypair you configure is the only place SOL can leave. Per-call costs are exact (the server doesn't ever pay more than the 402 challenge demands), but if you're paranoid about runaway tool-calls during agent experimentation, fund the payer wallet with a small float — say 0.05 SOL — and let it run dry rather than top it up unattended.

Security model

• The MCP server reads but never modifies your keypair file. The keypair is loaded into memory once at startup; the signature for each paid call happens locally; only the resulting tx signature ever leaves your machine (sent to magpie-x402 in the X-Payment header).
• The Magpie x402 service has no way to sign anything on your behalf. Even with a complete compromise of x402.magpie.capital, the worst case is that you pay for tool calls you didn't get useful results from. Your keypair is not exposed.
• For high-stakes write paths (build-borrow, build-deposit, etc.) the server returns an unsigned tx. Your agent receives it as plain text; you decide whether to sign + submit it. The MCP server itself never signs anything besides x402 payment transfers.

Troubleshooting

Tool doesn't appear in host UI — restart the host after editing config. Most hosts only re-read the MCP config on launch.

402 error on a paid tool — MAGPIE_MCP_PAYER_KEYPAIR is unset or the file doesn't exist. Run solana-keygen new -o ~/.config/solana/magpie-mcp.json and point the env var at the result, then solana transfer … a small SOL float in.

fetch failed on x402.magpie.capital — check the URL is reachable from your machine. If you're behind a corporate proxy, set HTTPS_PROXY in the same env block.

RPC rate-limit during a paid call — switch SOLANA_RPC_URL to a paid Helius/Triton/QuickNode URL. The default api.mainnet-beta.solana.com will throttle under any sustained use.

For maintainers — publishing to npm

The package is set up for npm publish with no additional configuration. From mcp/:

# One-time per machine:
npm login --scope=@magpieloans

# Each release:
# 1. Bump version in package.json (semver)
# 2. Publish — prepublishOnly rebuilds dist/ and chmod +x's the binary
npm publish

The package is scoped (@magpieloans/magpie-mcp) and publishConfig.access: "public" is set, so publish doesn't require any extra flags. The files field whitelists what ships — only dist/, README.md, LICENSE end up in the tarball (~9 KB).

Verify the contents before publish:

npm pack --dry-run

License

MIT.