eth_feeHistory

Return fee-market history.

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

Parameter limits

JSON path	Frozen limit	Source
`$[2].schema.items.maximum`	`100`	OpenRPC schema constraint
`$[2].schema.items.minimum`	`0`	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	10 RPS	base_read_rpc
Basic	20 RPS	base_read_rpc
Pro	100 RPS	base_read_rpc
Business	250 RPS	base_read_rpc
Enterprise	250 RPS	base_read_rpc

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.

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

Evidence

Fixture: missing — No complete successful correlated request/response pair.
Fixture registry: infra-4-sety/integration-base/research/R00/import/FIXTURES_INDEX.json.
Evidence boundary: no fixture-backed runtime claim is made.

Limitations

Availability is the frozen baseline, not deployed readiness. documented is the contract floor; evidence_kind retains unknown/source_summary.

Params schemadocumented

JSON

[
  {
    "name": "blockCount",
    "required": true,
    "schema": {
      "$ref": "#/components/schemas/Quantity"
    }
  },
  {
    "name": "newestBlock",
    "required": true,
    "schema": {
      "$ref": "#/components/schemas/BlockTag"
    }
  },
  {
    "name": "rewardPercentiles",
    "required": true,
    "schema": {
      "items": {
        "maximum": 100,
        "minimum": 0,
        "type": "number"
      },
      "type": "array"
    }
  }
]

Result schemaOpenRPC

JSON

{
  "name": "history",
  "schema": {
    "$ref": "#/components/schemas/FeeHistory"
  }
}