eggplant-sdk 0.2.0

A Python SDK for Polymarket: CLOB trading with all signature types, relayer operations (merge/split/convert/redeem), order-book streams, Gamma and Data APIs

🍆 eggplant-sdk-py 🐍

A highly performant python sdk for Polymarket.

A complete, standalone Polymarket client — signing, posting, cancels, relayer operations, and streaming — built for correctness, with zero dependency on the official SDK. This is the Python sibling of eggplant-sdk-rs; the two share one API shape and one set of golden test vectors.

Why

• Resilient by design. Tick sizes are plain Decimals (a closed enum breaks the day the venue adds a grid), wire types degrade leniently instead of failing whole responses, order books parse per-element, cancel bookkeeping distinguishes terminal from transient misses, and the Data API's offset-cap recycling and the relayer's non-429 quota responses are handled.
• Complete for real trading. All four signature types, gasless merge/split/convert/redeem through the relayer, order books, positions, Gamma metadata, and both WS channels with the liveness protocol that keeps half-open sockets from silently eating your fills.
• Financially strict. decimal.Decimal on every order-affecting path — no floats where money moves.
• Async-first. httpx + websockets end to end; one event loop drives reads, writes, and streams.

Feature matrix

⚠️ Not (yet) at feature parity with the official Polymarket SDK. The first table is what this SDK supports (alongside the Rust sibling); the second lists official-SDK surfaces neither eggplant SDK implements yet.

Supported

Capability	eggplant-sdk-py	eggplant-sdk-rs	official polymarket_client_sdk_v2
L1 auth (create/derive API key)	✓ (golden-vector pinned)	✓	✓
Signature types 0 / 1 / 2 / Poly1271	✓ all four, one signer	✓	✓
Hot posting path	partial — isolated order/cancel pools + warm-up; no pinned DNS	✓ pinned DNS, warm tiers	—
Batch + singular place/cancel endpoint switching	✓	✓	—
Cancel bookkeeping (partition_cancels, terminal reasons)	✓	✓	—
Relayer v2: SAFE / SAFE-CREATE / DepositWallet batches	✓	✓	—
negRisk merge / split / convert / redeem + planning engine	✓	✓	split/merge/redeem as raw on-chain txs
Lenient order books (tick_size: Decimal, per-book parse)	✓	✓	closed tick enum (breaks on new grids)
Market WS: typed events, text PING/PONG liveness	✓	✓ (+ zero-copy parsing)	owned types
User WS: fills/orders + maker-side derivation + dedup	✓	✓	types only
Gamma / Data API clients	✓	✓	✓
Wallet CREATE2 derivation (proxy + Safe)	✓	✓	✓

Not (yet) supported

Capability	eggplant (py & rs)	official polymarket_client_sdk_v2
Midpoint / spread / price quote endpoints¹	—	✓
Last-trade-price REST endpoint¹	—	✓
Market listings & pagination (incl. sampling/simplified)	—	✓
Prices-history endpoint	—	✓
Single-order lookup (GET one order by id)	—	✓
API-key management (list / delete keys)	—	✓
Balance / allowance helpers (read + update)	—	✓
Notifications (fetch / dismiss)	—	✓
Rewards & earnings endpoints	—	✓
Order scoring (are_orders_scoring)	—	✓
Market-order builder with automatic marketable pricing²	—	✓

¹ Midpoint/spread (and a live last-trade feed) are one-liners off a local Book maintained from /books + the market channel (§4) — the REST quote endpoints just aren't wrapped. ² Taker orders are placed as explicit FOK/FAK limits here (see §3); there is no amount-in, price-discovered market-order helper.

Install

From PyPI:

pip install eggplant-sdk

Python ≥ 3.11. eth-account/eth-keys supply the key handling; every price/size the SDK takes or returns on order paths is a decimal.Decimal.

Usage

1. Authenticate

One builder covers all four venue signature types. The chain id always comes from the builder (default Polygon, 137) — never silently from the signer.

import os
from eggplant_sdk import ClobClient, LocalSigner
from eggplant_sdk.chain import POLYGON, derive_proxy_wallet, derive_safe_wallet
from eggplant_sdk.clob.types import SignatureType

signer = LocalSigner(os.environ["POLYMARKET_PRIVATE_KEY"])

# Type 0 (EOA holds the funds) — the default:
client = await ClobClient.builder().authenticate(signer)

# Type 1 (Magic/email proxy wallet) or 2 (browser Gnosis Safe): the wallet
# address is deterministic from your EOA —
proxy = derive_proxy_wallet(signer.address, POLYGON)
client = await (
    ClobClient.builder()
    .signature_type(SignatureType.PROXY)  # or GNOSIS_SAFE + derive_safe_wallet
    .funder(proxy)
    .authenticate(signer)
)

# Type 3 (ERC-1271 deposit wallet):
client = await (
    ClobClient.builder()
    .signature_type(SignatureType.POLY1271)
    .funder("0xYourDepositWallet")
    .authenticate(signer)
)

type	who holds funds (maker)	who signs
0 EOA	the EOA itself	EOA
1 PROXY (Magic/email)	proxy wallet	EOA
2 GNOSIS_SAFE (browser)	1-of-1 Safe	EOA
3 POLY1271 (deposit wallet)	deposit wallet	deposit wallet (wrapped)

authenticate runs the L1 handshake: it signs the ClobAuth attestation, tries POST /auth/api-key, and falls back to deriving the existing key. The pieces are also exposed directly, which is what a hot restart wants — persist the credentials once and skip the network round trip forever after:

creds = await ClobClient.builder().derive_api_key(signer)  # or create_api_key
client = (
    ClobClient.builder()
    .signature_type(SignatureType.POLY1271)
    .funder(deposit_wallet)
    .with_credentials(signer.address, creds)  # no network
)

Credentials redacts its secret and passphrase from repr() output.

2. Read market data

# CLOB metadata (public endpoints):
venue_time = await client.server_time()
tick = await client.tick_size(token_id)      # plain Decimal — any grid parses
neg_risk = await client.neg_risk(token_id)   # picks the signing domain below
market = await client.market(condition_id)   # tokens, tick, accepting_orders, …

# Order books — POST /books, parsed leniently (a malformed book is skipped,
# never poisons the batch). Chunked + concurrent past 500 ids:
books = await client.order_books([token_id])
by_id = await client.order_book_map(thousands_of_ids)

# Your open orders and trades (L2-authenticated, cursor-paged):
from eggplant_sdk.clob import OpenOrdersRequest
open_orders = await client.all_open_orders(OpenOrdersRequest())
trades = await client.trades(OpenOrdersRequest())

Event metadata and wallet holdings ride their own hosts, no credentials needed:

from eggplant_sdk.data import DataApiClient
from eggplant_sdk.gamma import GammaClient

# Page the open-event universe, or resolve one event by slug:
async with GammaClient() as gamma:
    page = await gamma.fetch_keyset_page(None, 50)  # feed back page.next_cursor
    events = await gamma.fetch_events_by_slug("some-event-slug")

# A wallet's positions (and what's redeemable):
async with DataApiClient() as data:
    positions = await data.all_positions("0xWallet…", 1.0)
    redeemable, hit_cap = await data.all_redeemable_positions("0xWallet…")

3. Place and cancel orders

Three steps: build a signer for the market's exchange domain, sign, POST through the poster. Amounts are raw 6-decimal units; for a BUY the maker amount is USDC (size × price) and the taker amount is shares (size); a SELL swaps them.

import time
from decimal import Decimal
from eggplant_sdk.clob.poster import PostTimings
from eggplant_sdk.clob.signing import (
    ExchangeDomain, build_signable_order_side, generate_salt, to_fixed_usdc,
)
from eggplant_sdk.clob.types import OrderType, Side

# Once per market family: negRisk and regular markets verify against
# different exchange contracts.
order_signer = client.order_signer(ExchangeDomain.ctf_v2(neg_risk))

# Once per process: the poster owns the write-path connection pools.
poster = client.poster()

# A resting BUY: 10 shares at 0.45, GTC + post-only (rests as maker
# liquidity; rejected rather than crossing).
size, price = Decimal(10), Decimal("0.45")
signable = build_signable_order_side(
    int(token_id),
    to_fixed_usdc(size * price),  # maker: USDC in
    to_fixed_usdc(size),          # taker: shares out
    client.identity,
    time.time_ns() // 1_000_000,
    OrderType.GTC,
    generate_salt(),
    True,  # post_only — only ever emitted for GTC/GTD
    Side.BUY,
)
signed = order_signer.sign_order(signable, signer)

timings = PostTimings()
posts = await poster.post_orders([signed], timings, int(time.time()))
response = posts[0].response
assert response.is_accepted(), response.error_msg

# Cancel by id (batched DELETE /orders; ≤1000 ids per request — use
# cancel_in_batches for more):
await poster.cancel_orders([response.order_id])

Taker orders are the same call with OrderType.FOK/FAK and post_only=False. A taker fill is credited from the POST response (making_amount/taking_amount) — it is not echoed on the user channel, which only carries maker fills.

Batch helpers for maker flows: place_resting / place_resting_sell sign and POST whole ladders of GTC post-only orders, place_marketable_sell fires a FAK whose limit is its own safety floor, and deep_warm_up keeps the sign→POST pipeline hot with unfillable FOKs. cancel_orders_by_side clears one side of the book without touching the other.

When a cancel response comes back, don't guess — partition it:

from eggplant_sdk import EggplantError
from eggplant_sdk.clob.poster import partition_cancels

batch = [(0, 0, order_id)]
try:
    result = await poster.cancel_orders(ids)
except EggplantError:
    result = None  # transport failure: partition retries everything
done, retry = partition_cancels(batch, result, lambda leg: leg[2])
# `done`: confirmed cancelled OR terminally gone (already filled/expired/…).
# `retry`: transient misses — a still-live order is never silently dropped.

4. Keep a live order book

Seed over REST, then apply the market channel. Reconnect on any exception — the resubscribe replays a fresh snapshot, so no state is lost beyond the gap.

from eggplant_sdk.book import Book
from eggplant_sdk.ws.market import (
    MarketBook, MarketPriceChange, MarketStream, MarketStreamConfig,
    MarketTickSizeChange,
)

book = Book()
stream = await MarketStream.connect(MarketStreamConfig(token_ids=[token_id]))

while (event := await stream.next_event()) is not None:
    if isinstance(event, MarketBook):
        book.apply_snapshot(
            ((lv.price, lv.size) for lv in event.bids),
            ((lv.price, lv.size) for lv in event.asks),
        )
    elif isinstance(event, MarketPriceChange):
        for entry in event.price_changes:
            if (side := entry.book_side()) is not None:
                # Idempotent: duplicate deliveries are no-ops.
                book.apply_delta(side, entry.price, entry.size)
    elif isinstance(event, MarketTickSizeChange):
        ...  # re-grid quotes
    best_ask = book.best_ask()

The stream owns the venue's text PING/PONG liveness protocol internally; a half-open socket surfaces as a WsError within ~30s instead of hanging for minutes. For redundant fan-outs, ws.util has the staggered recycle phasing that keeps long-lived connections fresh without two peers ever refreshing at once.

5. Watch your fills

The user channel delivers every maker fill on the API key, on every connection you open, with statuses that evolve (MATCHED → … → CONFIRMED/FAILED). Handle them in this order: gate on a final status before deduping (a RETRYING first sighting must not swallow the confirmation), dedup by trade id, filter maker_orders to your own key, and derive your side — the trade's top-level side describes the taker.

from eggplant_sdk.ws.user import (
    TradeMessage, UserStream, UserStreamConfig, trade_status_is_final,
)
from eggplant_sdk.ws.util import SeenIds, our_maker_side

our_key = client.credentials.key
stream = await UserStream.connect(UserStreamConfig(credentials=client.credentials))
seen = SeenIds(1024)

while (message := await stream.next_message()) is not None:
    if not isinstance(message, TradeMessage):
        continue
    if not trade_status_is_final(message.status) or not seen.insert(message.id):
        continue
    for maker in message.maker_orders:
        if maker.owner != our_key:
            continue
        side = our_maker_side(message.side, message.outcome, maker.outcome)
        print(f"filled {side} {maker.matched_amount} @ {maker.price}")

For redundancy, open several identically-subscribed UserStreams behind one shared SeenIds — first delivery wins.

6. Merge / split / convert / redeem (relayer)

Gasless position operations ride Polymarket's relayer as DepositWallet batches (requires relayer API credentials from the builder program). The negRisk math in one line each: merge burns YES+NO on a leg for $1; convert burns NO across k legs of one event and frees (k−1)·amount; split is merge's inverse; redeem collects a resolved market.

The engine turns live balances into the minimal submission plan — merges before converts, tier decomposition, gas-budget chunking, wallet-busy retries, and a final wrap of the freed USDC.e into pUSD:

from eggplant_sdk.convert import (
    ConvertJob, convert_legs, fmt_usdc, plan_jobs, process_job,
)
from eggplant_sdk.gamma import GammaClient
from eggplant_sdk.relayer import RelayerClient

# Legs come straight off Gamma:
async with GammaClient() as gamma:
    event = (await gamma.fetch_events_by_slug(slug))[0]
legs = convert_legs(
    ids for ids in (m.market_ids() for m in event.markets or []) if ids is not None
)
job = ConvertJob(slug=slug, legs=legs)

# Read-only dry run — one RPC balance snapshot, no submissions:
plans, _snapshot = await plan_jobs([job], rpc_url, wallet, 100_000)
print(f"would free {fmt_usdc(plans[0].proceeds)} USDC.e")

# The full cycle (plan → submit chunks → settle → wrap):
relayer = RelayerClient(relayer_api_key, relayer_api_key_address)
detail = await process_job(job, signer, relayer, rpc_url, wallet)

For a long-running process, spawn convert_worker with an asyncio.Queue and queue ConvertJobs as fills land — bursts coalesce into one shared cycle. Standalone builders (build_merge_calldata, build_split_calldata, redeem_calls, split_calls, …) need no RPC at all and feed RelayerClient.submit_deposit_wallet_batch directly.

⚠ splitPosition is the least-exercised call in this SDK. Its 2-arg form mirrors the merge exactly, but verify against the deployed adapter (or split a dust amount first) before trusting it with size.

Error semantics worth handling: RelayerQuotaExhaustedError means retry on your own fixed backoff (the relayer's resets in hint claims ~an hour; the quota actually frees in well under a minute), and err.is_wallet_busy() means a prior action is still settling and nothing was submitted — waiting and retrying is always safe.

7. One-time approvals

A fresh wallet must approve the exchange contracts before it can trade. For the Safe path (type 2), approval.ensure_approvals(signer, relayer, rpc_url) deploys the Safe if missing and grants pUSD + CTF approvals, idempotently. Deposit wallets (type 3) batch the same approve / setApprovalForAll calldata through submit_deposit_wallet_batch instead.

8. Handle errors

One EggplantError hierarchy end to end. The variants that should change your control flow:

• RateLimitError — HTTP 429 anywhere. The poster can also fan a RateLimitSignal into a supervising task (set_rate_limit_signal) so a breaker can pull quotes instead of hammering.
• RelayerQuotaExhaustedError / err.is_wallet_busy() — see §6.
• ApiError — non-2xx from a read endpoint, body attached.
• InvalidDataError — unparseable input/response, and the poster's transport failures (timeout included). On a failed place, reconcile against all_open_orders before assuming nothing rested — a lost ACK is not a lost order.
• WsError — WebSocket transport failure or liveness (PONG deadline) breach; reconnect.

Wire parsers themselves rarely error: unknown enum values come back as raw strings and optional fields default, because a strict parse of a drifting venue is an outage waiting to happen.

Venue notes

Rules and defaults the SDK encodes:

• Venue minimums: an order needs ≥ 5 shares (tick.MIN_SIZE) or $1 notional (tick.MIN_NOTIONAL); share sizes max 2 decimals (SIZE_DECIMALS, helpers floor_to_size_step / compute_order_size); prices live on [tick, 1 − tick] (TickEntry).
• Salts are masked to 2^53 − 1 (generate_salt) so the venue's JS tooling round-trips them; the wire serializes salt as a JSON number.
• Reuse one Poster; call warm_up() periodically (and size set_warm_sizes to your batch shape) so an order POST rides a reused connection instead of a fresh TLS handshake. Cancels ride their own pool by design.
• Data API offsets cap at 10,000 and then recycle the same page — all_positions stops there on purpose. Redeem to shrink a huge wallet.
• Order books can exceed 500 ids per request only via chunking — order_book_map does it concurrently for you.
• WS liveness is text "PING"/"PONG", not WebSocket ping opcodes; the streams enforce the 3-missed-pings deadline for you.

Examples

Runnable walkthroughs in examples/ — venue writes are gated behind EGGPLANT_LIVE_TRADE=1, everything else is read-only:

example	shows
quickstart	authenticate (any signature type) → read grid → sign → optionally place+cancel
stream_order_books	REST seed + market channel + Book maintenance (no credentials)
stream_user_fills	user channel with dedup, final-status gating, own-maker filtering
positions	Data API holdings + redeemable listing
convert_merge_split	Gamma → legs → read-only plan → optional relayer cycle; split builders
approvals_bootstrap	Safe-path approvals bootstrap

POLYMARKET_PRIVATE_KEY=0x… python examples/quickstart.py
TOKEN_IDS=<id> python examples/stream_order_books.py

Modules

module	contents
clob	ClobClient (auth, market/tick metadata, open orders, trades, cancel-all), signing (all-type OrderSigner), poster (Poster write path), books (lenient /books), tick (venue size rules), types
relayer	RelayerClient: SAFE / SAFE-CREATE / DepositWallet batch submission + EIP-712 hash builders
convert	merge/split/convert/redeem calldata, the tier planner, and the balance-read → plan → submit → wrap engine
approval	Safe-path approvals bootstrap
ws	market + user streams, liveness, recycle phasing, our_maker_side, SeenIds
gamma, data	event metadata and wallet positions
book, fee, chain, auth, signer	order-book state, fee math, contracts/hosts/CREATE2, L1/L2 primitives, local key signing

Verification

• Golden vectors shared with the Rust sibling (which cross-checked them against the official client): L1/L2 auth signatures, CREATE2 wallet addresses, relayer EIP-712 typehashes and a create-proxy hash.
• Differential tests: the precomputed EIP-712 signing fast path equals eth-account's generic encode_typed_data for every known exchange domain.
• EGGPLANT_LIVE=1 pytest tests/test_live.py runs read-only smoke tests against the production venue.

The signing stack is pinned byte-for-byte to the Rust sibling by the shared vectors; still, validate any new integration with small sizes first.

Notes

• Python ≥ 3.11.
• Relayer operations require API credentials from Polymarket's builder program.

Contributing

Dev setup, the test/lint workflow, project conventions, and the release process are in CONTRIBUTING.md.

Disclaimer

This software places real orders and moves real funds. It is provided as-is, without warranty of any kind; nothing here is financial advice. Validate every integration with minimum sizes first.