Delta API Go example

A minimal Go program that calls GET /v2/quote?mode=DELTA and prints the recommended route’s expected output and the spender from the returned delta block. Standard library only.

File tree

my-app/
├─ go.mod
└─ main.go

Install

mkdir my-app && cd my-app
go mod init example.com/my-app

`main.go`

package main

import (
	"encoding/json"
	"fmt"
	"net/http"
	"net/url"
)

func main() {
	params := url.Values{
		"srcToken":     {"0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE"}, // ETH
		"destToken":    {"0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48"}, // USDC
		"amount":       {"1000000000000000000"},                       // 1 ETH
		"srcDecimals":  {"18"},
		"destDecimals": {"6"},
		"side":         {"SELL"},
		"chainId":      {"1"},
		"mode":         {"DELTA"},
		"userAddress":  {"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"},
		"partner":      {"my-app-name"},
	}

	res, err := http.Get("https://api.velora.xyz/v2/quote?" + params.Encode())
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()

	if res.StatusCode != http.StatusOK {
		panic(fmt.Sprintf("HTTP %d", res.StatusCode))
	}

	var body struct {
		Delta struct {
			Route struct {
				Origin struct {
					Output struct {
						Amount string `json:"amount"`
					} `json:"output"`
				} `json:"origin"`
			} `json:"route"`
			Spender string `json:"spender"`
		} `json:"delta"`
	}
	if err := json.NewDecoder(res.Body).Decode(&body); err != nil {
		panic(err)
	}

	fmt.Println("expected output:", body.Delta.Route.Origin.Output.Amount)
	fmt.Println("spender:        ", body.Delta.Spender)
}

Run it

go run .

You should see the recommended route’s expected output (USDC, 6 decimals) and the spender address. An ERC-20 source approves the spender before building the order; this example sells native ETH, which needs no approval — it’s funded by a deposit transaction after submit instead (see Native ETH (dETH)).

Next: build, sign, submit

Pass the unmodified delta.route into POST /v2/delta/orders/build (with owner set to the user address) to get EIP-712 typed data back as { toSign, orderHash }. Sign toSign with an ERC-2098 compact signature, then POST /v2/delta/orders with order (the toSign.value), the signature, chainId, and your partner. Poll GET /v2/delta/orders/{orderId} for status. See Delta → How it works.

Pass delta.route verbatim to /v2/delta/orders/build. Reordering or re-encoding it will cause the build call to reject.

Delta overview — when to use Delta intents.
Delta → How it works — quote → build → sign → auction → settle.
Delta API reference — full parameter list.

Get started

Solver Network

Examples

File tree

Install

`main.go`

Run it

Next: build, sign, submit

​File tree

​Install

​main.go

​Run it

​Next: build, sign, submit

​Related pages

File tree

Install

`main.go`

Run it

Next: build, sign, submit

Related pages