Build on Epsilon

Epsilon is a trading platform on Robinhood Chain with advanced order types (limit, stop loss, DCA, trailing stop) for memecoins and RWAs. The developer platform gives you a keyed REST API — quotes, smart order routing, order placement, and market data — plus MCP servers so AI agents in Cursor, Claude, and any MCP client can trade programmatically.

Quickstart

1 — Get an API key. Keys are issued per Epsilon account. During early access, keys are concierge-issued — ask in the community or DM @TradeEpsilon. (Self-serve issuance with your Privy login lands with the developer dashboard.) Keys look like eps_… and are shown once at creation.

2 — First call: quote a swap. Amounts are raw token units (scaled by the token's decimals):

curl "https://api.epsilon.exchange/v1/route?tokenIn=0x…&tokenOut=0x…&amountIn=1500000000000000000&slippagePpm=10000" \
  -H "X-API-Key: eps_YOUR_KEY"

The response contains the best route, expected and minimum output, price impact in ppm, and the feeLegs that a signed order must embed.

3 — Explore the surface. Everything lives under /v1 and is documented in the interactive API reference:

Authentication

Every keyed endpoint accepts the key in either header form:

X-API-Key: eps_YOUR_KEY
# or
Authorization: Bearer eps_YOUR_KEY

Keys are secrets: server-side only, never in browser code or repos. A leaked key can be disabled instantly and reissued — rotation is free.

Rate limits

Limits are per key (not per IP) over a sliding minute, in three buckets:

Every response carries X-RateLimit-Limit and X-RateLimit-Remaining; a 429 includes Retry-After. Order submission additionally has per-maker-wallet limits.

Amounts & prices

• Amounts are raw token units — decimal strings already scaled by the token's decimals. 1.5 WETH (18 decimals) is "1500000000000000000".
• Slippage is ppm (parts per million) in /v1 params: basis points × 100. 1% = 100 bps = 10000 ppm.
• Trigger prices are the price of 1 tokenIn expressed in tokenOut, scaled to tokenOut's decimals. 0 means execute at market (DCA legs).
• Chain: Robinhood Chain, id 4663. Live contract addresses at /v1/config.

Signed orders

Epsilon is non-custodial: an order is an EIP-712 message signed by the maker's wallet (domain EpsilonRouter v7, chain 4663), executed on-chain by keepers when the trigger condition is met. Funds stay in the maker's wallet until fill. The API key on POST /v1/orders is attribution and rate limiting — authorization is the signature itself.

Two integration paths:

• Local MCP package (@epsilon-exchange/mcp) — signs and submits for you; the private key never leaves your machine. Recommended. See the MCP guide.
• Raw HTTP — build and sign the order struct yourself, then POST /v1/orders. The full schema, maker-traits bit layout, and fee-leg rules are in the API reference. Fee fields must exactly match the feeLegs served by GET /v1/route for the same wallet.

Cancelling a pending order is also signed: EIP-712 OrderCancel(bytes32 orderHash) by the maker, sent with DELETE /v1/orders/{hash}.

Errors

Errors are JSON with a stable machine-readable code:

{ "error": "human-readable message", "code": "MACHINE_CODE" }

The complete, always-current catalog with retry guidance is served live at GET /v1/errors (no key required).