nansen-go

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A lightweight, dependency-free Golang client for the Nansen AI API. Context-aware, concurrency-safe, and fully typed, with functional options, automatic retries and exponential backoff on rate limits, and rich, typed error handling. Covers Smart Money, Token God Mode, Profiler, Portfolio, and historical backtesting endpoints.

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# nansen-go

![Nansen AI Golang SDK](https://i.postimg.cc/hGsGsnDF/nansen-ai-api-golang.jpg)

[![Go Reference](https://pkg.go.dev/badge/github.com/tigusigalpa/nansen-go.svg)](https://pkg.go.dev/github.com/tigusigalpa/nansen-go)

A Go client for the [Nansen AI API](https://docs.nansen.ai/) that tries to stay out of your way. No third-party
dependencies, no surprises — just the standard library and an API that feels like the rest of your Go code.

**Package:** [pkg.go.dev/github.com/tigusigalpa/nansen-go](https://pkg.go.dev/github.com/tigusigalpa/nansen-go)

> 📖 **[Full documentation available on Wiki](https://github.com/tigusigalpa/nansen-go/wiki)**

## Why you might like it

- **Nothing to vendor.** The whole thing is built on the standard library. `go get` it and you're done — no dependency
  tree to audit.
- **Contexts everywhere.** Every call takes a `context.Context` first, so timeouts and cancellation work exactly the way
  you'd expect.
- **Configured with options, not structs.** `WithBaseURL`, `WithHTTPClient`, `WithTimeout`, `WithRetry` — mix and match
  what you need.
- **Safe to share.** Create one client and hand it to as many goroutines as you like. No locks, no fuss.
- **Typed on purpose.** Chains, sort fields, trader types, and labels are real constants. Optional request fields are
  pointers, so a stray `false` or `0` never sneaks into your JSON.
- **Errors you can actually inspect.** Failures come back as an `*APIError` with the status code, message, raw body, and
  rate-limit headers — and they play nicely with `errors.Is`.
- **Retries when you want them.** Opt in with `WithRetry` and the client backs off exponentially on 429s, honoring
  `Retry-After`, `RateLimit-Reset`, and `X-RateLimit-Reset` along the way.

## Installation

```bash
go get github.com/tigusigalpa/nansen-go
```

## Quick Start

```go
package main

import (
    "context"
    "fmt"
    "log"
    "os"
    "time"

"github.com/tigusigalpa/nansen-go"
)

func main() {
    client, err := nansen.New(os.Getenv("NANSEN_API_KEY"),
        nansen.WithTimeout(30*time.Second),
        nansen.WithRetry(3, 500*time.Millisecond, 5*time.Second),
    )
    if err != nil {
        log.Fatal(err)
    }

ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
    defer cancel()

tf := nansen.Timeframe24H
    resp, err := client.TokenGodMode.TokenScreener(ctx, &nansen.TokenScreenerRequest{
        Chains: []nansen.Chain{nansen.ChainEthereum, nansen.ChainSolana},
        Timeframe: &tf,
        Pagination: &nansen.PaginationRequest{
            Page:    nansen.IntPtr(1),
            PerPage: nansen.IntPtr(20),
        },
    })
    if err != nil {
        log.Fatal(err)
    }

for _, t := range resp.Data {
        fmt.Printf("%s on %s\n", t.TokenSymbol, t.Chain)
    }
}
```

You'll need a `NANSEN_API_KEY` — grab one from [Nansen](https://nansen.ai/).

## Configuring the client

Everything is optional. Pass only the options you care about; the rest fall back to sensible defaults.

```go
client, err := nansen.New(apiKey,
    nansen.WithBaseURL("https://api.nansen.ai"),
    nansen.WithHTTPClient(&http.Client{Timeout: 10*time.Second}),
    nansen.WithTimeout(30*time.Second),
    nansen.WithRetry(3, 500*time.Millisecond, 5*time.Second),
)
```

| Option           | Description                                                                                            |
|------------------|--------------------------------------------------------------------------------------------------------|
| `WithBaseURL`    | Override the default base URL (`https://api.nansen.ai`).                                               |
| `WithHTTPClient` | Provide a custom `*http.Client`.                                                                       |
| `WithTimeout`    | A default request timeout, used when your context doesn't already carry a deadline.                    |
| `WithRetry`      | Turns on automatic retries with exponential backoff. Takes max attempts, initial delay, and max delay. |

## What's available

The API surface is split into services that hang off the client:

- `client.SmartMoney` — netflows, holdings, and DEX trades.
- `client.TokenGodMode` — the token screener, flow intelligence, and who-bought-sold.
- `client.Profiler` — current balances and DEX trade history for an address.
- `client.Portfolio` — DeFi holdings.
- `client.Historical` — the backtesting endpoints under `/api/v1beta1/`.

## When things go wrong

Every API failure comes back as an `*nansen.APIError`, so you can dig into exactly what happened:

```go
resp, err := client.SmartMoney.Netflow(ctx, req)
if err != nil {
    var apiErr *nansen.APIError
    if errors.As(err, &apiErr) {
        fmt.Println(apiErr.StatusCode)
        fmt.Println(apiErr.Message)
        fmt.Println(apiErr.RawBody)
        fmt.Println(apiErr.Headers.Get("RateLimit-Remaining"))
        if apiErr.RetryAfter != nil {
            fmt.Println("retry after:", *apiErr.RetryAfter)
        }
        if apiErr.RateLimitRemaining != nil {
            fmt.Println("requests remaining:", *apiErr.RateLimitRemaining)
        }
    }
}
```

If you just want to branch on the kind of failure, reach for `errors.Is` and the built-in sentinels:

```go
if errors.Is(err, nansen.ErrRateLimited) { /* ... */ }
if errors.Is(err, nansen.ErrUnauthorized) { /* ... */ }
if errors.Is(err, nansen.ErrNotFound)      { /* ... */ }
```

## About retries

Once you've called `WithRetry`, the client quietly retries a few situations for you:

- **429 Too Many Requests** — it waits according to `Retry-After` or `RateLimit-Reset`/`X-RateLimit-Reset`, and stashes
  `RateLimit-Remaining`/`X-RateLimit-Remaining` on the returned `APIError` in case you want to peek at your remaining
  quota.
- **Transient 5xx responses** — the kind that usually clear up on a second try.
- **Flaky network errors** — unless your context has already been cancelled.

Backoff grows exponentially but never exceeds the max delay you set. One thing worth knowing: your timeout budget (from
`WithTimeout` or a deadline on the context) covers **all** the attempts together, not each one on its own — so you
always stay within the bound you asked for.

## Optional fields and pointer helpers

Optional request fields are pointers, which means `false`, `0`, and empty strings only get sent when you actually mean
them:

```go
req := &nansen.TokenScreenerRequest{
    Chains: []nansen.Chain{nansen.ChainSolana},
    Filters: &nansen.TokenScreenerFilters{
        IncludeStablecoins: nansen.BoolPtr(false),
        MarketCapUSD: &nansen.NumericRangeFilter{
            Min: nansen.Float64Ptr(1_000_000),
            Max: nansen.Float64Ptr(50_000_000),
        },
    },
}
```

To keep that from getting tedious, there are little helpers for the common types:

- `StringPtr(s string) *string`
- `IntPtr(i int) *int`
- `BoolPtr(b bool) *bool`
- `Float64Ptr(f float64) *float64`

## Examples

If you'd rather learn by running something, the [`examples`](examples/) directory has a few complete programs:

- [`examples/screener`](examples/screener/main.go) — the token screener with filters and sorting.
- [`examples/profiler`](examples/profiler/main.go) — address balances and DEX trade history.
- [`examples/smart_money`](examples/smart_money/main.go) — Smart Money netflows, holdings, and DEX trades.

Point one at your API key and go:

```bash
NANSEN_API_KEY=your_api_key go run ./examples/screener
```

## Endpoints covered

### Smart Money

- `POST /api/v1/smart-money/netflow`
- `POST /api/v1/smart-money/holdings`
- `POST /api/v1/smart-money/dex-trades`

### Token God Mode & Screener

- `POST /api/v1/token-screener`
- `POST /api/v1/tgm/flow-intelligence`
- `POST /api/v1/tgm/who-bought-sold`

### Profiler

- `POST /api/v1/profiler/address/current-balance`
- `POST /api/v1/profiler/dex-trades`

### Portfolio

- `POST /api/v1/portfolio/defi-holdings`

### Historical Data (Backtesting)

- `POST /api/v1beta1/tgm/historical-token-flow-summary`
- `POST /api/v1beta1/smart-money/historical-token-balances`

## Testing

There's a unit test suite covering the retry/backoff logic, error mapping, and option validation. Run it the usual way:

```bash
go test ./...
```

## License

nansen-go

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