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Chain SimulationService

chain-simulation

Simulate an EVM transaction without sending it. POST JSON {"chain_id": 1, "from": "0x...", "to": "0x...", "data": "0x...", "value": "0"} to /v1/chain (to required; data, from, value in wei and block optional); chains: Ethereum (1), Optimism (10), BNB Chain (56), Polygon (137), Base (8453), Arbitrum (42161). The response is a JSON object with success, gas_used, return_data, revert_reason when it would fail (including insufficient funds), asset_moves (native value plus every ERC-20 and ERC-721 Transfer the call would emit, with symbols and scaled amounts), simulated_on_block and logs_count. Signature and balance-for-gas checks are off; nothing is broadcast.

Active Suppliers
2
of 2 ever configured
Service Info
Service ID
chain-simulation
Compute Units / Relay
100,000
Owner
pokt10…87pn
Active Applications
2
Relay Mining EMA
1 relays
Service Metadata Cardsource: on-chain metadata (LCD)
{10 items
"schema":"pocket-service-card/v1"
"description":"Simulate an EVM transaction without sending it. POST JSON {"chain_id": 1, "from": "0x...", "to": "0x...", "data": "0x...", "value": "0"} to /v1/chain (to requir..."
"rpc_types":[1 item
0:{4 items
"type":"REST"
"intent":"expected"
"backend_hint":"chain-simulation HTTP server on :8080; POST /v1/chain (POST / also reaches it through the relay), GET /v1/health + /v1/version."
"notes":"Every response is a JSON object; errors are JSON 4xx with an error field."
}
]
"apis":[1 item
0:"sim-api"
]
"specs":[1 item
0:{4 items
"kind":"openapi"
"api":"sim-api"
"url":"https://services.supnodes.com/specs/chain-simulation/openapi.json"
"notes":"Machine-readable OpenAPI 3.0.3 contract for this service, with example requests."
}
]
"access":"public"
"results":"variable"
"serving":{7 items
"backend":"Single-process Python 3 HTTP server, standard library only, behind a RelayMiner (rest backend). No auth toward the backend; callers cannot send headers. Runs et..."
"implementations":[1 item
0:"chain-simulation >= 1.0"
]
"docs":"https://services.supnodes.com/specs/chain-simulation/README.md"
"min_disk_gb":1
"min_ram_gb":1
"healthcheck":[3 items
0:{4 items
"rpc_type":"REST"
"request":{2 items
"path":"/v1/version"
"method":"GET"
}
"expect":{2 items
"json_path":"$.service"
"matches":"^chain-simulation$"
}
"notes":"Identity probe: pins the backend to this service so a wrong backend cannot be staked under this id."
}
1:{4 items
"rpc_type":"REST"
"request":{2 items
"path":"/v1/health"
"method":"GET"
}
"expect":{2 items
"json_path":"$.status"
"matches":"^ok$"
}
"notes":"Readiness probe."
}
2:{4 items
"rpc_type":"REST"
"request":{3 items
"path":"/v1/chain"
"method":"POST"
"body":{2 items
"to":"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"
"data":"0x18160ddd"
}
}
"expect":{2 items
"json_path":"$.success"
"matches":"^true$"
}
"notes":"Functional probe: a read-only call on USDC; one RPC call."
}
]
"notes":"Upstream is Pocket Network RPC (publicnode.com fallback). Gateway operators: configure as type passthrough with rpc_types ["rest"]."
}
"docs":"https://services.supnodes.com/specs/chain-simulation/README.md"
"updated":"2026-09-27"
}