Paste hex or base64 to decode instantly

Auto-detects UET (8 bytes) and Envelope (22+ bytes, magic 0xEC50).

Auto-decodes as you type. Supports UET and Envelope payloads.

Valid UET Round-trip verified

Hex

Base64

Bit map (64 bits)

Hex byte map

Field	Bits	Raw value	Decoded

Valid Envelope HMAC not verified

Hex

Base64

Envelope hex map

Field	Offset	Raw value	Decoded

Nested payload

Field	Raw value	Decoded

HMAC verification (Web Crypto API)

Scenario Builder

Build deterministic UET payloads interactively and compare size impact instantly.

Preset EmergencyType Priority

ActionFlags SoundAlarm FlashLights Vibrate PlayVoice ShowMessage LockDoors UnlockDoors NotifyExternal

ZoneHash

TimestampMinutes ConfirmHash

Hex

Base64

Size comparison for this scenario (estimated)

CAP XML 0 B

JSON 0 B

ECP 0 B

Protocol Advisor

Estimate JSON vs Protobuf vs ECP vs CAP XML for your specific scenario. Outputs are estimated and intentionally honest.

Scenario input

1) What are you sending? 2) Current payload size (bytes) I don't know (use default 200 B) 3) Transport channel 4) How many recipients?

5) Must be human-readable? Messages per day (for bandwidth estimate)

Recommendation table ESTIMATED

Format	Estimated size	Fitness	Why

Sizes are estimated from typical protocol overhead. For exact measurements, benchmark with your actual payloads.

Strategy Selector

Uses public SDK NeverWorse strategy defaults 🔎

Recipients

Message size (bytes) Has template savings Has dictionary savings

Estimated network cost

Direct 0 B

FullCascade 0 B

JSON Bridge

Paste JSON, estimate JsonBridge envelope output, and preview internal UET mapping.

ECP Hex

Code Generator

Production-ready C# snippets generated from the current Build scenario.

Verify decoder (full suite)

Runs 34 deterministic vectors (8 UET + 9 Envelope + 7 HMAC + 10 Negative) directly in your browser.

Tests the decoder engine itself, not your input.

SDK Package Coverage in Studio

Package	In Studio	How	Phase
ECP.Core	Full interactive	Encode/decode/envelope/HMAC/code gen	A+B
ECP.Cascade	Code walkthrough	Strategy selector + future cascade visualization	C/E
ECP.Compatibility	Full interactive	JSON Bridge (JSON -> ECP)	C
ECP.Registry	Code walkthrough	Public links + dictionary/template concept	C
ECP.DependencyInjection	Code walkthrough	DI Setup snippets in Generate	B
ECP.Standard	Code walkthrough	AddEcpStandard() generation pattern	B
ECP.Transport.Abstractions	Concept only	Architecture references	C
ECP.Transport.WebSocket	Concept only	Architecture references	C
ECP.Transport.SignalR	Concept only	Architecture references	C

Claim-to-code trace

UET = 8 bytes 🔎 Source uet-fire-critical-001
Envelope header = 22 bytes 🔎 Source env-signed-uet-h12-001
Magic = 0xEC50 🔎 Source env-signed-uet-h12-001
HMAC default = 12 bytes (range 8-16) 🔎 Source hmac-data-12-002
Canonical benchmark sizes are measured from generated payloads 🔎 Source ProofCard CLI
NeverWorse strategy defaults 🔎 Source public defaults

Input error

Bit map (64 bits)

Hex byte map

Envelope hex map

Nested payload

HMAC verification (Web Crypto API)

Size comparison for this scenario (estimated)

Scenario input

Recommendation table ESTIMATED

Strategy Selector

Estimated network cost

JSON Bridge

SDK Package Coverage in Studio

Claim-to-code trace