Pay any Algorand x402 invoice with any asset, plus DEX swap quotes and unsigned builds.
MCP server exposing HOGSWAP to AI
agents: DEX-aggregated quotes, unsigned swap builds, zero-human API-key
self-registration, and the star — pay_x402_invoice: pay any
Algorand-settled x402 invoice with any 1–4 assets you hold, via an
exact-out router swap. API reference:
hogswap-v1.liquihog.dev/reference.
Building an app rather than an agent? Official SDKs:
hogswap-js-sdk (npm)
and hogswap-py-sdk (PyPI).
Strictly non-custodial: every transaction-producing tool returns unsigned groups; you sign with your own wallet tooling and submit yourself. Never give any tool a mnemonic or private key.
npm install
HOGSWAP_API_KEY=hsk_... node src/index.mjs # key optional
Claude Code: claude mcp add hogswap -e HOGSWAP_API_KEY=hsk_... -- node <abs-path>/src/index.mjs
| Env | Meaning |
|---|---|
HOGSWAP_API_URL | API base (default https://hogswap-v1.liquihog.dev) |
HOGSWAP_API_KEY | hsk_ bearer key; self-issue via the register_agent / verify_registration tools |
Free (no key): list_payable_assets, get_quote, register_agent,
verify_registration. get_quote takes optional max_legs (1–16)
to cap total route legs, splits included — for replaying the route
under your own resource budget.
🔑 Require a HOGSWAP API key (set HOGSWAP_API_KEY, or self-issue one
with register_agent → sign → verify_registration): build_swap,
pay_x402_invoice, get_credit_offer, get_balance, plus the watch
tools set_watch / list_watches / delete_watch (standing
server-side price/target alerts — free of charge, but namespaced by
key). Without a key these return an auth error, not a build.
Watch fires are numbers-only hints — re-quote with get_quote when
one fires. From MCP, poll list_watches; outside MCP the server
pushes events over SSE at GET /watches/stream.
pay_x402_invoice returns two groups (swap, then payment) — sign all
txns in one pass, submit the groups in order; the swap's on-chain
floor guarantees the payment is funded. A HOGSWAP credit top-up's 402
offer is itself an x402 invoice: feed its accepts[0] (with the
note nonce) straight into pay_x402_invoice to buy credits with
any asset.
The same 12 tools are served over MCP Streamable HTTP at
https://hogswap-v1.liquihog.dev/mcp/ — hosted by the HOGSWAP API
itself, no local process needed. Use the trailing slash — the
bare /mcp 307-redirects to /mcp/, costing an extra round trip per
call. Point any remote-capable MCP client at it; pass your key as
Authorization: Bearer hsk_... (the Claude API connector's
authorization_token does exactly this).
HOGSWAP_API_KEY=hsk_... \
SMOKE_PAY_TO=<any USDC-opted addr> node test/smoke.mjs # stdio
HOGSWAP_API_KEY=hsk_... \
SMOKE_PAY_TO=<any USDC-opted addr> node test/smoke-remote.mjs # remote
Both default to the live API; set HOGSWAP_API_URL (stdio) or
MCP_URL (remote) to point them at another instance. Read-only +
build-only; nothing is signed or broadcast.
Source-derived launch command. Check the maintainer’s required arguments and credentials before running:
npx -y hogswap-mcpMerge this template into ~/Library/Application Support/Claude/claude_desktop_config.json. Keep existing servers. Add any arguments, credentials, and permissions required by the maintainer; this template has not been install-tested.
{
"mcpServers": {
"io-github-liquihog-hogswap-mcp": {
"command": "npx",
"args": [
"-y",
"hogswap-mcp"
]
}
}
}Restart Claude Desktop completely for changes to take effect. Confirm the server appears connected in the client’s tool list, then try a read-only example from its documentation.
Claude Desktop setup referencehogswap-mcpnpmio.github.LiquiHog/hogswap-mcp works with any MCP-compatible client. Copy the config snippet from the Configuration section above and add it to the file shown for your client, then restart the application.
~/Library/Application Support/Claude/claude_desktop_config.jsonRestart Claude Desktop completely for changes to take effect.~/.cursor/mcp.jsonRestart Cursor for changes to take effect..vscode/mcp.jsonReload VS Code window for changes to take effect.~/.codeium/windsurf/mcp_config.jsonRestart Windsurf for changes to take effect..mcp.jsonSave at the project root, then start Claude Code in that project and review the MCP server approval prompt. Keep real credentials out of shared files.