trace_call

scaffold — described by api.2.2/2.3/2.4

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
`$[1].schema.items.enum`	`["trace","vmTrace","stateDiff"]`	OpenRPC schema constraint
`$[1].schema.minItems`	`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	— (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_f20_trace2.json.
Fixture SHA-256: 74028854adf23b3127b2cff3a756cfa6e3f5bf7907e0bbd5a73f3f7f76816f56.
Fixture registry: infra-4-sety/integration-base/research/R00/import/FIXTURES_INDEX.json.
Semantic assertion: Invalid params observations remain parser-only; truncated successful trace text is not full fixture.
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

B04 section 6 says three shapes rejected; standard candidate not a working dRPC Base schema.
Availability is the frozen baseline, not deployed readiness. documented is the contract floor; evidence_kind retains unknown/source_summary.

Params schemaparser_only

JSON

[
  {
    "name": "call",
    "required": true,
    "schema": {
      "$ref": "#/components/schemas/BaseR03_call"
    }
  },
  {
    "name": "traceTypes",
    "required": true,
    "schema": {
      "items": {
        "enum": [
          "trace",
          "vmTrace",
          "stateDiff"
        ]
      },
      "minItems": 0,
      "type": "array"
    }
  },
  {
    "name": "block",
    "required": true,
    "schema": {
      "$ref": "#/components/schemas/BaseR03_blockTag"
    }
  }
]

Result schemaOpenRPC

JSON

{
  "description": "Frozen source has no complete success-result schema.",
  "name": "unavailable",
  "schema": {
    "not": {}
  }
}