No install snippet on purpose. A working MCP config is a command, its arguments and an environment block — the last two are where API keys live, so this catalogue never stores them and cannot publish them. Follow the link above for the authors' own instructions.

For an agent

Everything you need to decide whether to call this server, and what it will cost, is in this section. Read no further unless a human is asking.

Install

claude mcp add dex-data -- npx -y dex-data-mcp

Or, for any MCP host that reads a JSON config:

{ "mcpServers": { "dex-data": { "command": "npx", "args": ["-y", "dex-data-mcp"] } } }

Cost model

The first 25 calls each day are free on every tool. No wallet, no signup, no API key, no account. The free answer is the full answer — nothing is stubbed, truncated or degraded. What the free tier limits is how many calls you make, not what is in them.

After 25 calls in a day, a tool returns a payment challenge instead of an answer. If — and only if — a wallet is configured, this server settles that challenge in USDC on Base and returns the answer. With no wallet it tells you the price and spends nothing.

Environment

variable	what it does	default
`DEX_WALLET_KEY`	EVM private key that pays. Omit it and this server can never spend anything. `EVM_PRIVATE_KEY` is read as a fallback.	unset — free tier only
`DEX_MAX_PRICE_USD`	Per-call ceiling. A call costing more is refused before paying.	`0.05`
`DEX_MAX_SPEND_USD`	Total for the life of the process.	`1.00`
`DEX_MAX_CALLS`	Number of paid calls for the life of the process.	`200`
`DEX_MCP_TIMEOUT_MS`	Upstream request timeout.	`45000`

The default ceiling is $0.05, which is exactly the dearest tool here. Lower it below that and the $0.05 tools stop working — deliberately, and they say so.

The cap, and what "fails closed" means

Every paid call passes the same four gates, in this order, and any one of them refuses without paying:

No wallet → never pays. This is the state you are in unless someone set a key.
Price unreadable → refuses. A challenge whose amount cannot be parsed is not treated as free or as cheap; it is treated as unknown, and unknown does not get paid.
Price above DEX_MAX_PRICE_USD → refuses, and names the price and the cap.
Would cross DEX_MAX_SPEND_USD or DEX_MAX_CALLS → refuses.

Accounting is in integer micro-USD, so a $1.00 budget at $0.05 a call buys exactly 20 calls and not 19 — floating-point drift cannot quietly close the budget early.

Call get_spend_budget before any loop over paid tools. It is free, local and makes no network call, and it returns what has been spent and every cap in force.

Tools

Thirteen tools. Twelve fetch from the gateway; one is local. Each of the twelve targets exactly one route, and together they are exactly the routes the storefront lists — there is no hidden catalogue and no tool pointing at something that was withdrawn.

Dex Data