veynor 1.3.3

Prediction market intelligence for agents and traders — Kalshi + Polymarket

veynor

Python client for the Veynor prediction market intelligence API.

Cross-venue data across Kalshi and Polymarket: whale trades, smart money signals, arb opportunities, and market search — in a single import.

pip install veynor

---

Quickstart

import veynor

client = veynor.Client(api_key="vey_sk_...")

# Whale trades across both venues
whales = client.whales(venue="all", min_notional=10_000)
for t in whales["trades"]:
    print(t["platform"], t["market"], t["side"], f"${t['notional']:,.0f}")

# Arb opportunities between Kalshi and Polymarket
arb = client.signals(signal_type="arb_opportunities")
for opp in arb["arb_opportunities"]:
    print(opp)

Get a free API key at veynor.xyz/agents.

---

Authentication

Pass your key directly or via environment variable:

# Option 1: direct
client = veynor.Client(api_key="vey_sk_...")

# Option 2: environment variable
# export VEYNOR_API_KEY=vey_sk_...
client = veynor.Client()

---

Methods

client.whales()

Recent large trades across Kalshi and Polymarket.

whales = client.whales(
    venue="all",           # "all" | "kalshi" | "polymarket"
    min_notional=8_000,    # minimum trade size in USD
    category="Politics",   # "All" | "Sports" | "Politics" | "Other"
    limit=20,
)
# Returns: { summary, trades: [...], meta }

client.top_markets()

Top markets by 24-hour volume.

markets = client.top_markets(
    venue="all",
    category="All",
    limit=10,
)
# Returns: { summary, kalshi: [...], polymarket: [...], meta }

client.search()

Search markets by keyword across both venues.

results = client.search("fed rate", venue="all", limit=10)
# Returns: { summary, polymarket: [...], kalshi: [...], meta }

client.market()

Full details for a specific market.

# Polymarket: use condition ID
m = client.market("polymarket", "0x1234...")

# Kalshi: use ticker
m = client.market("kalshi", "KXNBA-25-LAL")

# Returns: { summary, market: {...}, meta }

client.signals()

Alpha signals: wide spreads, price movers, cross-venue arb.

signals = client.signals(
    signal_type="all",   # "all" | "wide_spreads" | "price_movers" | "arb_opportunities"
    limit=10,
)
# Returns: { summary, wide_spreads, price_movers, arb_opportunities, meta }

client.usage()

Check your credit balance. Always free.

u = client.usage()
print(u["tier"], u["credits_remaining"])

---

Credit costs

Method	Credits
whales()	2
top_markets()	1
search()	1
market()	1
signals()	3
usage()	0

Free tier: 100 credits/month. Upgrade at veynor.xyz/agents.

---

Exceptions

from veynor import VeynorError, AuthError, RateLimitError

try:
    whales = client.whales()
except AuthError:
    print("Invalid or expired API key")
except RateLimitError:
    print("Rate limit hit — slow down or upgrade tier")
except VeynorError as e:
    print(f"API error {e.status_code}: {e}")

---

REST API

All SDK methods map directly to REST endpoints at https://api.veynor.xyz. Pass your key via X-API-Key header.

# Whale trades
curl -s -H "X-API-Key: vey_sk_..." \
  "https://api.veynor.xyz/v1/whale-trades?min_notional=10000&venue=all&limit=10"

# Top markets by 24h volume
curl -s -H "X-API-Key: vey_sk_..." \
  "https://api.veynor.xyz/v1/markets/top?venue=all&limit=10"

# Price movers (biggest moves in last hour)
curl -s -H "X-API-Key: vey_sk_..." \
  "https://api.veynor.xyz/v1/signals?signal_type=price_movers&limit=10"

# Arb opportunities across venues
curl -s -H "X-API-Key: vey_sk_..." \
  "https://api.veynor.xyz/v1/signals?signal_type=arb_opportunities"

# Search markets
curl -s -H "X-API-Key: vey_sk_..." \
  "https://api.veynor.xyz/v1/markets/search?q=fed+rate"

# Specific market (Polymarket condition ID or Kalshi ticker)
curl -s -H "X-API-Key: vey_sk_..." \
  "https://api.veynor.xyz/v1/markets/polymarket/0x1234..."
curl -s -H "X-API-Key: vey_sk_..." \
  "https://api.veynor.xyz/v1/markets/kalshi/KXNBA-25-LAL"

# Credit usage
curl -s -H "X-API-Key: vey_sk_..." \
  "https://api.veynor.xyz/v1/usage"

Endpoint	Params	Credits
GET /v1/whale-trades	venue, min_notional, category, limit	2
GET /v1/markets/top	venue, category, limit	1
GET /v1/markets/search	q (required), venue, limit	1
GET /v1/markets/:venue/:id	—	1
GET /v1/signals	signal_type, limit	3
GET /v1/usage	—	0

signal_type options: price_movers, wide_spreads, arb_opportunities, all

---

Use in a Jupyter notebook

import veynor, pandas as pd

client = veynor.Client()
data   = client.whales(min_notional=15_000, limit=50)
df     = pd.DataFrame(data["trades"])
df[["market", "side", "notional", "platform"]].sort_values("notional", ascending=False)

---

Polymarket order execution (optional)

The trade commands let you place market orders on Polymarket directly from the CLI. All signing happens locally. Your private key is never sent to Veynor's servers.

1. Install trade dependencies

pip install veynor[trade]

This adds py-clob-client and eth-account on top of the base install.

2. Get your private key from Polymarket

Go to polymarket.com, open your profile settings, and find the Private Key section. The steps are the same regardless of how you signed up.

If you signed up with email (Magic wallet): Polymarket walks you through exporting your key via Magic.link. Settings > Private Key > sign into Magic.link > copy the key shown.

If you connected MetaMask or another external wallet: Export the key directly from your wallet app. MetaMask: Settings > Accounts > Account details > Show private key.

Once you have it, store it in your shell environment. Never in code, never committed to git:

export POLYMARKET_PRIVATE_KEY=0x...

Add that line to ~/.zshrc or ~/.bash_profile to persist it across sessions.

The CLOB client derives your API credentials from the key locally on each run. Nothing is stored or sent to Veynor.

3. Trade

# Check your USDC balance on Polygon
veynor trade balance

# List open positions
veynor trade positions

# Buy $50 of YES shares on a market
# TOKEN_ID is the outcome token address — find it with:
#   veynor market polymarket <condition_id> --json
veynor trade buy 0xabc123... --amount 50

# Sell 100 shares
veynor trade sell 0xabc123... --shares 100

# Mirror the latest whale trade (1% of their notional by default)
veynor trade copy

# Copy a specific whale size, custom amount
veynor trade copy --min-notional 50000 --amount 200 --yes

All trade commands prompt for confirmation before executing. Pass --yes to skip.

Finding token IDs

Each Polymarket outcome (YES/NO) has a token ID (a Polygon address). Get it from the market detail:

veynor market polymarket <condition_id> --json | python3 -m json.tool

Or from the Polymarket UI: open a market, inspect the URL or the API response.

Errors and troubleshooting

Error	Fix
No private key found	Set POLYMARKET_PRIVATE_KEY in your shell
Failed to derive API credentials	Check that your key is a valid hex private key starting with 0x
Trading requires extra packages	Run pip install veynor[trade]
Order status unmatched	Insufficient liquidity at market price — try a smaller amount

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Links

• Register for an API key
• MCP server — connect directly from Claude Desktop or Cursor
• Web app — whale feed, smart money signals, trade interface