API referenceBlocks
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Fetch the spec-version transition timeline — the earliest known block at each distinct runtime spec_version, ascending by block_number. No query params: a single aggregate over the whole retained blocks window. spec_version is best-effort/nullable and wasn't tracked before 2026-06-25, so coverage_from_block/coverage_from_at bound what this endpoint can see. Computed live from the first-party blocks D1 tier (#4316/3.1).
Response Body
application/json
application/json
application/json
application/json
application/json
curl -X GET "https://example.com/api/v1/runtime"{ "data": { "coverage_from_at": "2026-06-01T00:00:00.000Z", "coverage_from_block": 5000000, "current_spec_version": 1, "schema_version": 1, "transition_count": 1, "transitions": [ { "block_number": 5000000, "spec_version": 1 } ] }, "meta": { "artifact_path": "example", "cache": "short", "contract_version": "2026-06-29.1", "generated_at": "2026-06-01T00:00:00.000Z", "pagination": { "collection": "example", "cursor": 1, "limit": 1, "next_cursor": 1, "order": "asc", "returned": 1, "sort": "example", "total": 1 }, "published_at": "2026-06-01T00:00:00.000Z", "source": "live-cron-prober", "stale_contract": { "built_under": "example", "live": "example" } }, "ok": true, "schema_version": 1}Empty
{ "data": null, "error": { "code": "string", "message": "string" }, "meta": { "artifact_path": "string", "cache": "short", "contract_version": "string", "generated_at": "string", "pagination": { "collection": "string", "cursor": 0, "limit": 0, "next_cursor": 0, "order": "asc", "returned": 0, "sort": "string", "total": 0 }, "published_at": "2019-08-24T14:15:22Z", "source": "string", "stale_contract": { "built_under": "string", "live": "string" } }, "ok": false, "schema_version": 1}{ "data": null, "error": { "code": "string", "message": "string" }, "meta": { "artifact_path": "string", "cache": "short", "contract_version": "string", "generated_at": "string", "pagination": { "collection": "string", "cursor": 0, "limit": 0, "next_cursor": 0, "order": "asc", "returned": 0, "sort": "string", "total": 0 }, "published_at": "2019-08-24T14:15:22Z", "source": "string", "stale_contract": { "built_under": "string", "live": "string" } }, "ok": false, "schema_version": 1}{ "data": null, "error": { "code": "string", "message": "string" }, "meta": { "artifact_path": "string", "cache": "short", "contract_version": "string", "generated_at": "string", "pagination": { "collection": "string", "cursor": 0, "limit": 0, "next_cursor": 0, "order": "asc", "returned": 0, "sort": "string", "total": 0 }, "published_at": "2019-08-24T14:15:22Z", "source": "string", "stale_contract": { "built_under": "string", "live": "string" } }, "ok": false, "schema_version": 1}{ "data": null, "error": { "code": "string", "message": "string" }, "meta": { "artifact_path": "string", "cache": "short", "contract_version": "string", "generated_at": "string", "pagination": { "collection": "string", "cursor": 0, "limit": 0, "next_cursor": 0, "order": "asc", "returned": 0, "sort": "string", "total": 0 }, "published_at": "2019-08-24T14:15:22Z", "source": "string", "stale_contract": { "built_under": "string", "live": "string" } }, "ok": false, "schema_version": 1}