Authentication

PolySimulator uses two auth methods, scoped to different jobs:

Method	Header	Use it for
API key (primary)	`X-API-Key: ps_live_…`	Everything bots touch: trading, market data, websockets, balance/positions/history reads
Supabase Bearer JWT (dashboard / one-time)	`Authorization: Bearer …`	Self-service surfaces the dashboard reads with your signed-in session: `POST /v1/keys/bootstrap`, key management (`GET/POST/DELETE /v1/keys`, `/v1/keys/tiers`, `/v1/keys/ws-token`), `GET /v1/me`, `/v1/account/me/entitlements`, and `/v1/me/wallets/*`

Most users only ever see the API key — the dashboard at polysimulator.com/api-keys handles the Bearer-JWT bootstrap with your signed-in Supabase session, so you click a button and copy the ps_live_… value. The Bearer-JWT API path exists for headless setups (CI, dev tooling) where there’s no browser session. The Polymarket-CLOB-compatible read endpoints (e.g. /v1/book, /v1/midpoint, /v1/spread, /v1/markets-by-token) are public and don’t require a key. For convenience, PolySimulator also accepts the single-value header aliases POLY_API_KEY and Authorization: Bearer ps_live_…, each carrying the whole ps_live_ key, on authenticated routes (X-API-Key takes precedence when several are sent).

# Standard
curl -H "X-API-Key: ps_live_abc123..." \
     https://api.polysimulator.com/v1/markets

# Equivalent — single-value POLY_API_KEY alias (PolySimulator convenience)
curl -H "POLY_API_KEY: ps_live_abc123..." \
     https://api.polysimulator.com/v1/markets

These aliases are a deliberate PolySimulator simplification — not a literal match of Polymarket’s request shape. Real Polymarket L2 auth attaches five POLY_* headers per request — POLY_ADDRESS, POLY_SIGNATURE (an HMAC-SHA256 of the request), POLY_TIMESTAMP, POLY_API_KEY, POLY_PASSPHRASE — and py-clob-client / @polymarket/clob-client never send a bare POLY_API_KEY or an Authorization: Bearer <key> on their own. PolySimulator collapses all of that to one value (your ps_live_ key) and ignores HMAC signing because it’s a paper-trading backend. So porting a bot still means pointing the SDK’s host at PolySimulator and feeding it the ps_live_ key — the aliases just mean common HTTP clients that default to Authorization: Bearer … or send POLY_API_KEY aren’t rejected; they don’t make a real py-clob-client work unchanged.

Bearer is rejected on every trading and market-data endpoint. POST /v1/orders, POST /v1/order, POST /v1/clob/order, DELETE /v1/orders/{id}, GET /v1/markets*, GET /v1/book, GET /v1/midpoint*, the websocket connect URL, and GET /v1/account/{balance,positions,portfolio,history,equity} all require X-API-Key (or the POLY_API_KEY alias). This keeps the surface short-lived JWTs can reach narrow and auditable — short-lived browser tokens cannot reach the trade engine.

Key Format

Keys follow a predictable pattern for easy identification:

ps_live_<64 random hex chars>

Example: ps_live_a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6a7b8c9d0e1f2a3b4c5d6a7b8c9d0e1f2 Each key has a visible prefix (first 16 chars) used for identification without exposing the full key:

	Value
Full key	`ps_live_a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6a7b8c9d0e1f2a3b4c5d6a7b8c9d0e1f2`
Prefix	`ps_live_a1b2c3d4`

How It Works

When you send a request:

Your API key is SHA-256 hashed and looked up in the database
The key’s is_active and expires_at fields are validated
Rate limits are enforced based on your key’s tier
The associated user account is loaded for trading operations

Permissions

Keys support granular permissions:

Permission	Grants Access To
`read`	Market data, prices, balance, positions, order history
`trade`	Place orders, cancel orders, cancel-all, batch orders

A key with only read permission cannot place trades. Create a key with ["read", "trade"] permissions for bot usage.

Key management is gated by auth, not by the trade scope. Creating, listing, renaming, rotating, and revoking keys (POST/GET/PATCH/DELETE /v1/keys, /v1/keys/{id}/rotate) only require a valid credential for your account — any active ps_live_ key (even a read-only one) or your dashboard Supabase JWT. You don’t need a trade-scoped key to manage keys. (Free-tier keys are still read-only for trading and can’t be created with trade — that’s enforced at creation, see below.)

Security Best Practices

Store keys in environment variables

Never hardcode API keys in source code. Use environment variables or a secrets manager.

export POLYSIM_API_KEY="ps_live_kJ9mNx2p..."

import os
api_key = os.environ["POLYSIM_API_KEY"]

Rotate keys for short-lived CI/CD deployments

There is no expires_at field on key creation — POST /v1/keys and POST /v1/keys/bootstrap only accept name, tier, and permissions. (expires_at is set server-side: it appears on a rotated key’s old half during the 24h overlap window, and on beta-issued keys as their beta_until cutoff.) For short-lived deployments, rotate instead: POST /v1/keys/{id}/rotate mints a replacement and schedules the old key to expire after a 24h overlap, so you can roll a key without downtime and let the old one lapse on its own.

Principle of least privilege

Create separate keys for different bots:

Data-only bot: ["read"] permission
Trading bot: ["read", "trade"] permission

Rotate keys regularly

Create a new key, update your bot, then revoke the old key:

# 1. Create new key
curl -X POST -H "X-API-Key: $OLD_KEY" \
  https://api.polysimulator.com/v1/keys \
  -d '{"name": "bot-v2", "permissions": ["read", "trade"]}'

# 2. Update your bot's environment variable

# 3. Revoke old key
curl -X DELETE -H "X-API-Key: $NEW_KEY" \
  https://api.polysimulator.com/v1/keys/OLD_KEY_ID

Maximum 5 keys per user

The system enforces a limit of 5 active keys per user account. Revoke unused keys to free up slots.

Error Responses

Status Code	Meaning	Common Causes
`401 Unauthorized`	Invalid, expired, or deactivated API key	Typo in key, key was revoked, key expired
`403 Forbidden`	Key lacks required permission for the endpoint	Using a `read`-only key to place trades
`429 Too Many Requests`	Rate limit exceeded	Too many requests per second/minute for your tier

All /v1/* errors return Polymarket-shape: a single error field holding a human-readable description when one is available. (For unhandled exception paths where no message was set, the body falls back to the short machine code — so always branch on the X-Polysim-Code response header for stable error handling, not on the body text.) The X-Polysim-Code response header carries a stable short code — domain-specific where the handler knows what went wrong (e.g. INVALID_KEY, INSUFFICIENT_PERMISSION, RATE_LIMIT_EXCEEDED, BOOK_UNAVAILABLE, VALIDATION_FAILED), or HTTP_<status> as a generic fallback (HTTP_400, HTTP_500). The X-Request-Id response header always echoes the request id for log/support correlation.

// 401 — Invalid API key (handler sets X-Polysim-Code: INVALID_KEY)
{"error": "Invalid API key"}
// + headers: X-Polysim-Code: INVALID_KEY, X-Request-Id: a1b2c3d4-...

// 403 — Missing permission
{"error": "API key missing required permission: trade"}
// + headers: X-Polysim-Code: INSUFFICIENT_PERMISSION, X-Request-Id: ...

// 429 — Rate limited
{"error": "Rate limit exceeded. Retry after 1s."}
// + headers: X-Polysim-Code: RATE_LIMIT_EXCEEDED, X-Request-Id: ..., Retry-After: 1

Common auth/permission codes — branch on X-Polysim-Code:

Code	HTTP	When
`MISSING_AUTH`	401	No `Authorization: Bearer …` or `X-API-Key` (or `POLY_API_KEY`) on a route that requires one
`MISSING_API_KEY`	401	`X-API-Key` / `POLY_API_KEY` is missing on a key-only route (e.g. trading, market data, account reads)
`INVALID_KEY`	401	Key doesn’t exist or is revoked
`INVALID_TOKEN`	401	Bearer JWT is malformed, missing `sub`, or fails signature verification
`KEY_EXPIRED`	401	Key past its `expires_at`
`KEY_DEACTIVATED`	401	Key was administratively disabled
`KEY_OWNER_NOT_FOUND`	401	Underlying user record missing (rare)
`TOKEN_EXPIRED`	401	Bearer JWT expired
`ACCESS_RESTRICTED`	403	An already-issued key (or a Bearer JWT) is not on the API v1 allowlist. Returned on authenticated `/v1/*` requests for accounts outside the admin-managed allowlist, and for accounts flagged or under review.
`CLOSED_BETA`	403	Key issuance is gated: `POST /v1/keys` / `POST /v1/keys/bootstrap` refuse callers who are not in an admitted closed-beta cohort. The default outcome while the beta is closed. Apply via the waitlist.
`API_PRO_COMING_SOON`	403	Key issuance for a paying Pro / Pro+ account that doesn’t yet have a cohort grant — a billing-aware “rolling it out in cohorts” variant of the issuance gate. Only reached once self-serve issuance is enabled; until then a paying caller also sees `CLOSED_BETA`.
`INSUFFICIENT_PERMISSION`	403	Key lacks `trade` / other scope
`RATE_LIMIT_EXCEEDED`	429	Per-key or per-IP burst exceeded

On 429 responses, check the Retry-After header for exact wait time in seconds.

Verbose body opt-in. Send X-Polysim-Verbose: true on the request to get the legacy verbose body shape — useful while writing or debugging an SDK:

{"error": "INVALID_KEY", "message": "Invalid API key",
 "details": null, "request_id": "a1b2c3d4-..."}

The default single-field shape matches Polymarket’s own /clob error contract, so PM-shape SDK ports work without translation.

Bootstrap Flow (First-Time Setup)

The recommended path is the dashboard at polysimulator.com/api-keys. Sign in, click Create your first API key, and copy the ps_live_… value shown once. The dashboard handles the Supabase JWT exchange transparently.

Bootstrap from a script (headless / CI)

If you can’t open a browser and you have a Supabase access token in hand, call POST /v1/keys/bootstrap directly:

import requests

# Obtain via a programmatic Supabase sign-in — most users don't
# need this path; the dashboard does it for you.
supabase_jwt = "your_supabase_access_token"

resp = requests.post(
    "https://api.polysimulator.com/v1/keys/bootstrap",
    headers={
        "Authorization": f"Bearer {supabase_jwt}",
        "Content-Type": "application/json",
    },
    json={"name": "my-first-bot"},
)

if resp.status_code == 201:
    raw_key = resp.json()["raw_key"]
    print(f"Save this key NOW (shown only once): {raw_key}")
elif resp.status_code == 400:
    print("You already have keys — use POST /v1/keys with X-API-Key instead")
elif resp.status_code == 401:
    print("Invalid or expired Supabase JWT — sign in again at polysimulator.com")
elif resp.status_code == 403:
    # Branch on the stable machine code in the `X-Polysim-Code` header.
    # The response body is PM-shape `{"error": "<human msg>"}`, so the
    # body's `error` field is the human message — NOT a stable code.
    # Header lookup is case-insensitive in `requests` / most HTTP libs.
    code = resp.headers.get("X-Polysim-Code")
    if code == "CLOSED_BETA":
        # API key issuance is in closed beta — your account isn't in an
        # admitted cohort yet. Apply via the waitlist at
        # https://polysimulator.com/api-trading; we'll email you when a cohort opens.
        print("Closed beta — apply at https://polysimulator.com/api-trading")
    elif code == "API_PRO_COMING_SOON":
        # Your Pro / Pro+ subscription includes API access — it's being
        # rolled out in cohorts. Check your billing page.
        print("Pro API access is rolling out — see /account/billing")
    elif code == "ACCESS_RESTRICTED":
        # The account is not on the API v1 allowlist (flagged / under review).
        print("Access restricted — contact support")
    else:
        print(f"403 [{code}]: {resp.json().get('error')}")
elif resp.status_code == 429:
    print("Bootstrap rate limit hit — wait and retry")

headers = {"X-API-Key": raw_key}
health = requests.get("https://api.polysimulator.com/v1/health", headers=headers)
print(health.json())  # {"status": "ok", "timestamp": "...", "version": "1.0.0"}

Security boundary

JWTs are verified using HS256 against the project’s Supabase signing secret, with audience="authenticated", signature, expiry, and the sub UUID all enforced server-side. Anon and service-role tokens are rejected.
Bearer is accepted on the dashboard surface only: POST /v1/keys/bootstrap, key management (GET/POST/DELETE /v1/keys, /v1/keys/tiers, /v1/keys/ws-token), GET /v1/me, GET /v1/account/me/entitlements, and /v1/me/wallets/* — the routes the signed-in dashboard reads. Trading (/v1/orders, /v1/order, /v1/clob/order), market data (/v1/markets*, /v1/book, /v1/midpoint*, etc.), the account-trading reads (/v1/account/{balance,positions,portfolio, history,equity}), and the websocket connect URL all require X-API-Key and reject Bearer with 401 — short-lived JWTs cannot reach the trade engine or the account ledger.
Bootstrap is idempotency-bounded: if the JWT subject already has any key, the endpoint returns 400 BOOTSTRAP_NOT_ALLOWED and the caller must use POST /v1/keys (with X-API-Key) for additional keys.
Bootstrap is rate-limited at 5 calls/hour and 1 call/minute per IP, on top of the global IP rate limit. Real users only bootstrap once per account; the limit caps abuse without breaking legitimate network-error retries.

Closed Beta

The API is in an ongoing closed beta: new API keys are issued to approved cohorts only. There are two distinct gates, with distinct error codes — branch on the X-Polysim-Code response header:

1. Key issuance — `CLOSED_BETA` / `API_PRO_COMING_SOON`

POST /v1/keys/bootstrap (first key) and POST /v1/keys (additional keys) refuse callers who aren’t in an admitted cohort. While the beta is closed (the default), every non-admin, non-cohort caller — free, waitlisted, or paying — gets 403 CLOSED_BETA: apply via the waitlist and we’ll email you when a cohort opens. API_PRO_COMING_SOON is a conditional variant of the same gate. Once self-serve issuance is enabled, the gate routes by subscription tier: free callers self-serve a read-only key, while a paying Pro / Pro+ caller without a cohort grant gets the billing-aware 403 API_PRO_COMING_SOON (“your subscription includes API access; it’s being rolled out in cohorts”) instead. Until that flag flips, paying callers also see CLOSED_BETA. Both are PM-shape envelopes. The default body is the single-field {"error": "<human message>"} form; the stable machine code lives in the X-Polysim-Code response header. (The feature_key / upgrade_url routing hints from the underlying error are carried in the body only on 402 upgrade responses, not on these 403s — read them from the verbose body if you need them, via X-Polysim-Verbose: true.)

HTTP/1.1 403 Forbidden
X-Polysim-Code: CLOSED_BETA
X-Request-Id: a1b2c3d4-...
Content-Type: application/json

{"error": "API access is in closed beta. New keys are issued to approved cohorts only. Apply via the waitlist; we'll email you when a cohort opens."}

resp = requests.post(
    "https://api.polysimulator.com/v1/keys/bootstrap",
    headers={"Authorization": f"Bearer {supabase_jwt}"},
    json={"name": "first-key"},
)
if resp.status_code == 403:
    code = resp.headers.get("X-Polysim-Code")
    if code == "CLOSED_BETA":
        # Not in an admitted cohort yet. Apply via the waitlist; we'll
        # email you when a cohort opens.
        print("Closed beta — apply at https://polysimulator.com/api-trading")
    elif code == "API_PRO_COMING_SOON":
        # Your Pro / Pro+ subscription includes API access — being
        # rolled out in cohorts. Check /account/billing.
        print("Pro API access is rolling out — see /account/billing")

2. Runtime access — `ACCESS_RESTRICTED`

Once a key is issued, authenticated /v1/* requests are additionally gated by an admin-managed allowlist. An account that isn’t on the allowlist (or is flagged / under review) gets 403 ACCESS_RESTRICTED on every authenticated request. Like every /v1/* error, the stable machine code is in the X-Polysim-Code response header:

HTTP/1.1 403 Forbidden
X-Polysim-Code: ACCESS_RESTRICTED
X-Request-Id: a1b2c3d4-...
Content-Type: application/json

{"error": "API access restricted. Contact support to request access."}

Access is granted by our team once your waitlist application is approved; additions take effect on your next request. Apply via the waitlist at polysimulator.com/api-trading.

Beta-issued keys auto-downgrade after the cutoff

Beta-issued keys carry a fixed beta_until cutoff. After the cutoff, the key is auto-downgraded to free-tier limits and read-only permissions on every request. Every response on a downgraded key includes X-API-Beta-Cutoff: expired so SDKs can pivot to read-only mode without a separate round-trip:

resp = client.get_orders()
if resp.headers.get("x-api-beta-cutoff") == "expired":
    print("Beta cohort ended — convert to a paid Pro key for trade access")

The public cohort-status endpoint reports current capacity (no auth required, used by the pricing page):

curl https://api.polysimulator.com/api/beta/cohort-status
# → {"cohort_label": "beta-2026-05", "available": true, "active": 12,
#    "cap": 100, "cutoff": "2026-08-31T23:59:59Z", "reopens_at": null}

Getting Started

Core Concepts

Trading Guide

Market Data

Account & Portfolio

WebSocket Feeds

Bot Development

Going Live

Authentication

Authentication

Key Format

How It Works

Permissions

Security Best Practices

Error Responses

Bootstrap Flow (First-Time Setup)

Bootstrap from a script (headless / CI)

Security boundary

Closed Beta

1. Key issuance — `CLOSED_BETA` / `API_PRO_COMING_SOON`

2. Runtime access — `ACCESS_RESTRICTED`

Beta-issued keys auto-downgrade after the cutoff

Next Steps

​Authentication

​Key Format

​How It Works

​Permissions

​Security Best Practices

​Error Responses

​Bootstrap Flow (First-Time Setup)

​Bootstrap from a script (headless / CI)

​Security boundary

​Closed Beta

​1. Key issuance — CLOSED_BETA / API_PRO_COMING_SOON

​2. Runtime access — ACCESS_RESTRICTED

​Beta-issued keys auto-downgrade after the cutoff

​Next Steps

Authentication

Key Format

How It Works

Permissions

Security Best Practices

Error Responses

Bootstrap Flow (First-Time Setup)

Bootstrap from a script (headless / CI)

Security boundary

Closed Beta

1. Key issuance — `CLOSED_BETA` / `API_PRO_COMING_SOON`

2. Runtime access — `ACCESS_RESTRICTED`

Beta-issued keys auto-downgrade after the cutoff

Next Steps