On Fusaka, run PUSH1 1 PUSH1 2 ADD and show me the gas and the final stack.
🦓 Current mainnet EL — Fusaka
Status: Live on the public MCP.
baselineForkIdin the probe — today’s mainnet execution-layer rules.
This page tracks whatever fork mainnet EL is on right now. Today that is Fusaka (EL alias osaka; role alias mainnet-el). After Glamsterdam activates on mainnet, this doc (and probe metadata) will switch to Glamsterdam as current / baselineForkId, and the next preview fork moves under Preview forks. Fusaka twins stay advertised (this page becomes history); they are not dropped on activation.
Fusaka today
ModExp repricing (7883), secp256r1 precompile (7951), and related Fusaka EL changes are active on mainnet. Use this fork to run those features (adoption at your own pace) as well as to compare against Pectra or Glamsterdam. Predecessor in lineage: Pectra (historical table). Preview successor: Glamsterdam.
Activated EIP numbers are in the probe (namedForks[].activatedEips, eipIntroductions). PeerDAS (EIP-7594) is coverage: consensus. Blob sidecars are not run here.
Runnable FYP twins on Fusaka
| EIP | Page |
|---|---|
| 7883 | ModExp gas |
| 7951 | secp256r1 |
Full index: EIP catalogue.
Compare
| Goal | Run twice |
|---|---|
| One Fusaka EIP vs before it existed | Pectra → Fusaka (from derived module comparison or eipIntroductions) |
| Upcoming fork vs mainnet today | Fusaka → Glamsterdam |
What you can ask your agent
Prompts to copy
On Fusaka, CALL precompile 0x100 with a standard valid P-256 test vector (message hash, r, s, pubX, pubY) — does it return 0x01?
On Pectra then Fusaka, run the same 32-byte ModExp CALL (base, exponent, and modulus each 32 bytes of 0x02) — how much did gas increase?
Send 1 wei to an empty account on Fusaka, then send 1 wei to an empty account on Glamsterdam — how does paid gas differ?
Pass { "baseHardfork": "fusaka", "eips": [] } (or aliases osaka, mainnet-el). Fusaka is not the default lab fork — Glamsterdam is.
Provenance on a generic Fusaka run lists advertised modules 7883 and 7951 with eips: [].
Related
| Preview (Glamsterdam) | Default lab / upcoming |
| Historical forks | Paris → Pectra |
| EIP catalogue | Lineage + EIP twins |
| Fork timeline | External reference |
Current Mainnet Fork Changelog
Current Mainnet Fork Changelog
- v0.92026-10-06Fusaka runs are live on the hosted MCP.
- v0.82026-10-06Launch polish — prompt cards; wording unchanged.
- v0.72026-09-29PeerDAS (EIP-7594) is coverage consensus. Blob sidecars stay out of this lab.
- v0.62026-09-17Fusaka twins stay first-class after activation (adoption runs, not only compares).
- v0.52026-09-17Twin pages linked from this fork doc (sidebar no longer lists EIPs).
- v0.42026-09-17Canonical catalog id is fusaka; osaka is the EL alias; mainnet-el remains the role alias.
- v0.32026-09-16Doc framed as rotating mainnet section (Fusaka now; updates when mainnet fork changes).
- v0.22026-09-16Lineage and predecessor compare pattern.
- v0.12026-09-16Named fork capability — generic Fusaka runs.