eth_simulateV1

Simulate a non-empty sequence of block state calls.

Base mainnet, chain ID 8453base:rpcpro — enforced matrix policy, not measured capacity or runtime publicationAvailability: unknownValidation: parser_only

Parameter limits

JSON path	Frozen limit	Source
`$[0].schema.properties.blockStateCalls.minItems`	`1`	OpenRPC schema constraint

Historical block retrieval is not an archive-state guarantee. Selectors must be preserved; do not substitute pending, safe, or finalized with latest.

Rate limits and tier

These are enforced product-policy values, not measured upstream capacity or an SLA. Enterprise is finite, never physical “unlimited” capacity.

Tier	Limit / access	Category
Free	— (tier gated)	base_simulate
Basic	— (tier gated)	base_simulate
Pro	2 RPS	base_simulate
Business	5 RPS	base_simulate
Enterprise	5 RPS	base_simulate

See Base limits.

Errors

Code	Meaning here	Client action
`-32602`	Parameters fail the declared schema or upstream parser.	Fix the positional parameters; parser acceptance is not execution success.
`-32003`	The enforced category/provider budget is exhausted.	Honor `Retry-After`; no capacity SLA is implied.
`-32002`	The key is below the enforced minimum tier.	Upgrade only after the capability is runtime-enabled.

Authentication/transport failures use the shared client error envelope. See Base errors.

Evidence

Fixture kind: parser_only.
Fixture source: infra-4-sety/integration-base/research/R00/import/originals/probe/bse_v3t9_simulate_matrix.json at /surfaces.
Fixture SHA-256: 24c3fcc9d1c6b8b86c5430b539484457a46c2b1966da55c5456b2089367f8a05.
Fixture registry: infra-4-sety/integration-base/research/R00/import/FIXTURES_INDEX.json.
Semantic assertion: All six rpc_error -32602, accepted_by empty; no positive simulation.
Evidence boundary: Replay only this bounded assertion; no provider calls or original Python execution. Metadata/response fragments can test rejection but cannot prove capability.

Limitations

Base documents pending; other tags and provider limits need proof.
Base page error:string conflicts with other clients object error; raw fixture required before normalization.
Documented nonempty subset; broader call/override fields and returnFullTransactions not enabled by this profile.
Availability is the frozen baseline, not deployed readiness. documented is the contract floor; evidence_kind retains unknown/source_summary.

Params schemaparser_only

JSON

[
  {
    "name": "payload",
    "required": true,
    "schema": {
      "additionalProperties": false,
      "properties": {
        "blockStateCalls": {
          "items": {
            "$ref": "#/components/schemas/BaseR03_simBlockInput"
          },
          "minItems": 1,
          "type": "array"
        },
        "traceTransfers": {
          "default": false,
          "type": "boolean"
        },
        "validation": {
          "default": false,
          "type": "boolean"
        }
      },
      "required": [
        "blockStateCalls"
      ],
      "type": "object"
    }
  },
  {
    "name": "block",
    "required": true,
    "schema": {
      "$ref": "#/components/schemas/BaseR03_blockTag"
    }
  }
]

Result schemaOpenRPC

JSON

{
  "name": "result",
  "schema": {
    "$ref": "#/components/schemas/BaseR03_simulateResult"
  }
}