invarians 0.2.1

Python SDK for the Invarians panel API — direction-agnostic cross-chain attestations (L1, L2, bridges) for autonomous agents

invarians-py

Invarians makes invisible blockchain infrastructure failures observable — before they show up in gas fees.

L2 activity no longer shows up in L1 gas fees. Sequencer failures and bridge delays leave no economic trace. Fee monitors stay silent. Invarians detects them.

Since v0.2.0 (2026-04-20), the API is a direction-agnostic panel. A single call returns the current state of every tracked L1, L2, and bridge. The agent composes its own route client-side.

from invarians import InvariansClient

client = InvariansClient(api_key="inv_your_key_here")
panel  = client.get_panel()

eth    = panel.l1_by_chain("ethereum")
arb    = panel.l2_by_chain("arbitrum")
bridge = panel.bridge_by_id("arbitrum-ethereum/native")

if eth.regime.startswith("S2") or (arb and arb.regime and arb.regime.startswith("S2")):
    # Structural stress detected — L1, L2, or both
    # Invisible to fee monitors
    pause_agent_execution()

print(panel.oracle_status)          # "OK" | "DEGRADED"
print(eth.regime, eth.status)       # "S1D1" "OK"
print(bridge.state, bridge.status)  # None "UNCALIBRATED"  (P0, native calibration lands 2026-04-22)

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Install

pip install invarians[requests]  # default
pip install invarians[httpx]     # async-friendly

Requires Python 3.9+. Get an API key at invarians.com.

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What you can do with it

1. Pause execution when infrastructure degrades

panel = client.get_panel()
eth   = panel.l1_by_chain("ethereum")

if eth.regime and eth.regime.startswith("S2"):
    # Structural stress detected — hold until nominal
    return {"action": "hold", "reason": eth.regime}

2. Detect silent failures (S2D1)

S2D1 is the critical regime: structural stress with no demand signature. A fee monitor reports normal while Invarians detects degradation.

eth = client.get_panel().l1_by_chain("ethereum")

if eth.regime == "S2D1":
    # Chain slowing — no gas spike, no price move
    # Nothing shows on any fee monitor
    alert_ops("S2D1 detected on Ethereum")

3. Certify execution conditions

Every panel carries a signed attestation over its canonical JSON. Attach it to any agent action for audit or dispute resolution.

panel = client.get_panel()

if panel.is_fully_ok:
    result = execute_trade(...)
    sec = panel.signed_execution_context
    audit_log.append({
        "tx":               result.hash,
        "panel_version":    panel.version,           # "1.0.0"
        "issued_at":        panel.issued_at,
        "payload_hash":     sec.payload_hash,        # "0x{sha256}"
        "signature":        sec.signature,           # "hmac-sha256:{hex}"
        "key_id":           sec.key_id,              # "invarians-v1"
        "anchor":           sec.anchor,              # None in V1, on-chain anchor from May 2026
    })

4. Route around bridge stress

Bridge IDs are canonical: {chainA}-{chainB}/{type} (e.g. arbitrum-ethereum/native). Three native bridges are exposed at launch; CCTP and CCIP lanes are added in the panel on 2026-04-24 (calibration lands ≥ 2026-05-23).

panel  = client.get_panel()
bridge = panel.bridge_by_id("arbitrum-ethereum/native")

if bridge.state == "BS2":
    # Bridge degraded — route via alternative path
    use_fallback_bridge()
elif bridge.status == "UNCALIBRATED":
    # Raw signal still available — use with care
    age = bridge.last_batch_age_seconds
    if age is not None and age > 300:
        use_fallback_bridge()

5. Handle degraded data gracefully

oracle_status reports global health. Per-item status tells you exactly which signal is unreliable.

panel = client.get_panel()

if panel.oracle_status == "DEGRADED":
    # At least one L1 / L2 / bridge is STALE or UNAVAILABLE
    for entry in panel.l1 + panel.l2:
        if entry.status != "OK":
            log.warning(f"{entry.chain}: {entry.status}")
    for bridge in panel.bridges:
        if bridge.status in ("STALE", "UNAVAILABLE"):
            log.warning(f"{bridge.id}: {bridge.status}")
    fall_back_to_conservative_mode()

Per-item status values:

Status	Meaning
OK	Signal fresh and calibrated
STALE	Last update older than the freshness window (1h for L1/L2, 10m for bridges)
UNAVAILABLE	Signal temporarily missing
UNCALIBRATED	Collector running, thresholds not yet published — does not trigger DEGRADED

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Regimes

Code	Structure	Demand	What it means
S1D1	nominal	nominal	Infrastructure within calibrated norms
S1D2	nominal	elevated	Structurally sound, demand above baseline
S2D1	stress	nominal	The only regime where the chain degrades silently — no gas spike, no price signal. Invisible to gas monitors.
S2D2	stress	elevated	Structural stress and elevated demand simultaneously

Bridge states:

Code	Type	Meaning
BS1	native	Batches posted to L1 within calibrated cadence
BS2	native	Posting latency above P97/30d threshold
null	any	Not yet calibrated (raw last_batch_age_seconds still exposed)

CCIP (CS1/CS2) and CCTP (TS1/TS2) states arrive in the panel on 2026-04-24 (UNCALIBRATED) and calibrate ≥ 2026-05-23.

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Signal quality

Every L1 and L2 entry is enriched with explicit calibration metadata. The SDK never hides uncertainty.

sol = client.get_panel().l1_by_chain("solana")

print(sol.meta.m1_validated)            # False — backtest not yet validated
print(sol.meta.calibration_confidence)  # "LOW"
print(sol.meta.notes)                   # "π not calibrated. τ only."

Chain coverage

Chain	Layer	Confidence	Ready
ethereum	L1	MEDIUM	✅
polygon	L1	MEDIUM	✅
arbitrum	L2	LOW	⏳ 25 Apr 2026
base	L2	LOW	⏳ 25 Apr 2026
optimism	L2	LOW	⏳ 25 Apr 2026
solana	L1	LOW	⏳ July 2026
avalanche	L1	NONE	⏳ July 2026

Native bridges exposed at launch:

Bridge ID	Type	Calibrated	Calibration date
arbitrum-ethereum/native	native	❌	2026-04-22
base-ethereum/native	native	❌	2026-04-22
optimism-ethereum/native	native	❌	2026-04-22

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Verify a panel

panel     = client.get_panel()
payload   = panel_raw_dict                                      # as returned by the API
signature = panel.signed_execution_context.signature
valid     = client.verify_panel(payload, signature)
print(valid)  # True

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Error handling

from invarians.exceptions import AuthError, RateLimitError, ServerError

try:
    panel = client.get_panel()
except AuthError:
    print("Invalid API key")
except RateLimitError:
    print("Quota exceeded — free tier: 20 req/day")
except ServerError as e:
    print(f"Service unavailable: {e}")

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Migrating from v0.1.x

The legacy endpoints (/attestation/{chain}, /attestation/l2/{chain}, /attestation/execution-context) return HTTP 410 Gone since 2026-04-20, and the matching SDK methods raise NotImplementedError:

# Before (v0.1.x)
ctx = client.get_execution_context(l1="ethereum", l2="arbitrum")
print(ctx.proof.l1_regime, ctx.proof.l2_regime, ctx.proof.bridge_state)

# After (v0.2.x)
panel = client.get_panel()
eth   = panel.l1_by_chain("ethereum")
arb   = panel.l2_by_chain("arbitrum")
br    = panel.bridge_by_id("arbitrum-ethereum/native")
print(eth.regime, arb.regime, br.state)  # agent composes the route itself

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Documentation

API reference: invarians.com/developers.html

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License

MIT