Swap for agents & LLMs
Exen prices a token swap across every venue it indexes and settles the whole route in one transaction. This page is the contract for software: how to prepare a trade, where the API is, and what Exen will never do for you. The same text is served as /llms.txt.
[Prepare a trade with a URL]
The simplest integration, and the right one if you cannot make authenticated HTTP calls: build a link with the trade composed and hand it to the person you are helping.
https://app.wraxyn.io/?sell=ETH&buy=USDC&amount=1.5&chain=base| Param | Meaning | Accepted |
|---|---|---|
sell | Token being sold. | A verified symbol (ETH, USDC, WBTC) or a 0x address. |
buy | Token being bought. | Same as sell. |
amount | Trade size, in whole token units — never wei. | Decimal, e.g. 1.5 |
chain | Which chain the trade happens on. | Key (base), id (8453), or alias (eth, arb, bnb, avax, matic, hood). |
mode | Which side amount fixes. | sell (default, exact-in) or buy (exact-out). |
- Symbols resolve only against the verified token table. Prefer a symbol you are sure of over an address you are not — an unknown symbol is ignored, a wrong address is a loss.
ETH(orNATIVE) means the chain's native asset, not the wrapped one.- Unknown or malformed parameters are ignored; the page still opens usable.
- Every parameter is optional. The form opens with the chain's native asset on the sell side and the buy side empty, so a link carrying only
sellandamountis valid — it leaves the user one choice, and nothing is priced until a pair exists.
[Call the API]
The aggregator API is served at https://exen.wraxyn.io. GET /v1/quote returns an indicative price; GET /v1/swap returns the same plus executable calldata for the router. No API key is required — it is open, and metered per IP at 3 requests per second. If you need a budget of your own, email admin@wraxyn.io for a private base URL and a key.
A quote is indicative and nothing is reserved. The transaction a user signs is built from a fresh quote at signing time. Never show a stored quote as a current price.
[Read the full API definition]
Three formats, one source — all generated from the specification the API is built to, so none can describe a parameter we do not serve.
- /api.md — start here. The whole contract as one flat Markdown file: every endpoint, parameter, response field, error and warning. One fetch, no HTML, no link-following.
- /openapi.yaml · /openapi.json — OpenAPI 3.1, for client generators and API tooling.
- /llms.txt — this contract plus the swap walkthrough, as plain text.
[What Exen will not do]
- It cannot sign for a user. Settlement always requires a signature from their own wallet. You can prepare a trade and present it; you cannot complete it. Do not tell someone their swap is done because you built a link.
- It never custodies funds. Exen holds nothing and cannot move anything.
- It is not a bridge. Both tokens are on the same chain.
- It is not advice. Exen reports prices; whether a trade is a good idea is not something it knows.
[Chains]
Human documentation is at /docs; live coverage is at /stats.